## What Size Breaker for a 40 Gallon Electric Water Heater? [Calculated]

It is possible that we will receive commissions for purchases made through the links in this post.A circuit breaker is an essential piece of equipment for every circuit.When there is an overload, it safeguards the device by turning it off quickly.Because the water heater consumes a significant amount of power, it must be connected to the appropriate circuit breaker!The question is, what size breaker do you require for a 40-gallon electric water heater?Generally speaking, a 30A double pole breaker would be required for a 40-gallon electric heater.

10-2 non-metallic cables should be used in conjunction with these.Make certain, however, that your water heater is connected to a 240-volt dedicated circuit before proceeding.There should not be any other appliances connected to it at the same time.You might be wondering how to select the best breaker for your needs.

Which brings us to our point of view!Continue reading to find out more information!

## Factors that Determine the Right Breaker for A Electric Water Heater

Choosing the incorrect circuit breaker might result in significant incidents such as short circuits. Furthermore, selecting the proper circuit breaker is critical to the performance of your heater. As a result, when purchasing a circuit breaker, you must consider several factors. These elements are as follows:

### Voltage

The first thing you need to know about your heater’s voltage requirements is what it is. Depending on the size and wattage of the heater, the voltage might range between 220-240 volts. Your heater must be connected to a circuit based on the voltage it produces.

### Wattage

The voltage requirement of your heater is the first thing you should learn about. Depending on the size and wattage of the heater, the voltage might range from 220-240 volts. Depending on the voltage of your heater, it has to be connected to a circuit.

### Type of Wire

You must also know what type of wiring are compatible with your heater before you proceed any further. When choosing a heater, it’s important to consider the wattage. Making the mistake of using an unsuitable or defective wire might do more harm than good. Once you’ve taken note of all of these considerations, you may proceed to the following stage.

## What Size Breaker for a 40-Gallon Electric Water Heater Should I Get?

The process of determining the size of your circuit breaker has become rather straightforward in recent years.You only need to perform simple calculations in order to find the appropriate size circuit breaker for your needs.We must first establish the amperage in order to determine the appropriate size of the breaker.After dividing the wattage by the voltage, you may compute the resistance.Calculate 125 percent of the amperage to get at a safe quantity for the size of the breaker following that calculation.Choose the circuit breaker that is closest in amperage to the amperage value.

In addition, make certain that the heater’s wires are of the proper diameter.Now it’s time to go to work on the calculations: A 40-gallon water heater should have an average capacity of 4500 Watts and an emf of 240 volts.4500 watts is the wattage.240 VA is the voltage.

parage= 1500/240= 18.75A parage= 1500/240= 18.75A If you take into account the constant load we receive (18.75*125 percent = 23.4AThus), a 25 or 30A breaker should be sufficient for a 40-gallon breaker.However, for your own safety, we recommend that you purchase a 30A circuit breaker.When it comes to water heater breakers, here are some of our top picks for you to consider: These are some of the top products available on the market.

- We are confident that they will meet and exceed your expectations!

## Precautions before Determining The Size of Breaker:

When it comes to finding the proper breaker for your water heater, you must exercise extreme caution. If the circuit breaker is either too large or too little, it will only cause additional problems in the long run.

### In Case of Less Amperage

If your circuit breaker has less amperage than is necessary, it will trip repeatedly until it is replaced.This will cause your heating to be turned off unexpectedly.Additionally, it has the potential to harm the internal settings of your heater.Therefore, you should take the wattage of your switches into mind.You can’t always use a 15 amp switch on a 20 amp circuit because the circuit is too large.

### In Case of High Amperage

It might potentially be extremely dangerous if the amperage is higher than is necessary. Even in the event of an overload, it will not reply. This might do serious harm to your heater and any other appliances that are connected to it. The size of the circuit breaker you require for your 40-gallon electric heater has finally been determined. Now is the time to choose the best one for you!

## FAQs

Should I get a 4500-watt heater or a 5500-watt heater?Answer: It is fully dependent on your requirements.A 4500-watt heater, on the other hand, is preferable since it consumes less power.As a result, if you have similar heaters with differing wattages, we recommend that you get the 4500-watt heater.Question: How far away from the breaker box does the heater have to be in order to function properly?Answer: There should be a space between the panel and the wall with a depth of 36″.

Make certain that the front of your heater is at least 36″ away from your panel of electrical outlets.Is it necessary to have a neutral wire for an electric hot water heater?There is no need for a neutral wire with electric hot water heaters.Certain manufacturers, on the other hand, may include neutral wires in their heaters as an option.

## Final Words

- When it comes to most electric appliances, a breaker is a lifesaver. It has the potential to rescue your appliances from harm and to save them from suffering irreversible losses. However, the type of breaker you select has a significant impact on the outcome. In this post, we’ve covered all you need to know about choosing the right size circuit breaker for your 40-gallon electric water heater. We hope you find this information useful! Recent Posts by the Author

My name is Scott, and I’m from the town of Fort Mohave in the state of Arizona. By profession, I’m a software engineer, but my love is blogging and writing. In addition, I am the delighted father of two sons, George and Andrew. At the time, they are attending primary school. Scott Kelly’s most recent blog entries (See all of them)

## 40 gallon Electric water heater wire and breaker sizing question

- Messages 10 Reaction score 0 Points 0 Location Minnesota
- 1

I purchased a property in which the copper had been taken, as well as the water heater.I intend to install a low-cost 40-gallon Rheem 6-year water heater.I’ll have to run wiring because that’s also no longer available.I’m a little perplexed about the wiring and breaker.One of the heater’s features is that it includes two 4500-watt heating elements, which allows for speedier recuperation.It appears that the majority of water heaters are equipped with two heating components.

If my calculations are accurate, 4500 watts multiplied by two equals 9000 watts.9000 watts divided by 240 volts equals 37.5 amps As a result, I would want a 50 amp 220 breaker as well as 6 gauge wires.This seems reasonable for a 40-gallon electric water heater, doesn’t it?It appears to be excessively expensive for this little heater.

Where I believe the previous heater was, there appears to be a 30amp breaker and a 10-gauge wire running through the wall.Is it true that the new heaters consume so much more energy?Any suggestions would be much appreciated.

- Messages 707 The reaction score is one point and the location is Virginia.

Because the elements will not be running at the same time, utilize 4500W. I’m willing to bet the specifications on that WH call for a 30A breaker and 10ga wire. Any ″full size″ electric water heater will exhibit this characteristic. I have a WH that utilizes two 5400W elements and requires a 30A circuit.

#### DonL

##### Jack of all trades Master of one

Reaction score 69 points 48 messages 5,208 total points Houston, Texas is the location.

Dear dcorazal and welcome to Terry’s Forum. According to nukeman, the thermostats are connected in such a way that both components do not draw current at the same time. Wishing you the best of luck with your endeavor. Messages from DonL 0 points for a negative reaction score of ten Minnesota has a population of 0 people.

At the same time, I was thinking about the elements that were on. I’m delighted to hear that. In my research, I discovered that the price for 100 feet of 6 gauge wire is nearly as expensive as the cost of the heater. Thank you so much, Experts! 583 messages have been sent. Score 40 points for your reaction time. Florida is the 28th location.

As previously indicated, neither element is active at the same time.It starts with the higher element, and when the water at the top of the tank reaches the desired temperature, the upper element switches off and the heat is transferred to the lower element, which then heats the water at the bottom of the tank.The heater should have a label stating how much current it draws.The general rule of thumb is that the circuit capacity (wiring) and protection (breaker) should be 25 percent more than the maximum current flow on the circuit.Another way of looking at it is that the maximum current demand should be 80 percent of the capacity of the circuit breaker and wire.As a result, a 16 amp heater should be connected and protected by a 20 amp circuit, and a 20 amp breaker should only be able to handle a maximum 16 amp load on the circuit.

Overall, a 4500w heater with 240v will draw 4500/240 or 18.75 amps so10 wire and a 25 or 30 amp circuit breaker, depending on the local codes.The most recent modification was made on July 31, 2011.

## What Size Breaker for a Hot Water Heater? – SaveourH2O

What kind of electric water heater do you have at home?For example, you might want to find out what size breaker you should use for a hot water heater before purchasing one.In order for your water heater to function properly, you must have a circuit breaker installed.The majority of electric heaters require a 240-volt dedicated circuit; this circuit requires a 30-amp two-pole breaker and a 10-2 nonmetallic cable or metal-clad cable, among other components.The size of your water heater’s circuit breaker should be proportional to the electrical requirements of the heater.

## How Does A Circuit Breaker Work?

An electric breaker, also known as a circuit breaker, is responsible for ensuring that electrical connections remain in the safe mode, particularly in the case of a short circuit or an overcurrent incident.It pauses the current flow in order to prevent circuit damage, which can result in fires and the failure of the entire electrical system.It serves as a safety measure, protecting you from receiving an electric shock or having your water heater’s performance disrupted.

(Video) Size of Cable, Load in Ampere and Circuit Breaker Size | Cable Gland Size Chart

## How To Find The Proper Breaker Size For Water Heater?

When determining the exact breaker size you want for your water heater, it is critical to consider the capabilities of the circuit that will be serving the water heater.When designing a circuit, you should ask yourself, ″What is the greatest amount of electric current that I wish to pass through the circuit?″ According to the National Electrical Code, the size of the circuit breaker shall not be less than 125 percent or more than 125 percent.We must follow these four simple procedures in order to determine the suitable breaker size.Hopefully, at the end of this discussion, you will be able to make an informed decision about your water heater’s circuit breaker.Calculate the power rating of the water heater.

Identifying the existing rating of your water heater should be the first step in the process of upgrading your system.This information may be found on the heater’s specification label, which is located on the side of the unit.Residential water heaters are typically rated at 1500 watts of energy consumption or less.If your heater is powered by a 240-volt circuit, it consumes 4,500 watts.If a water heater has two heating elements, you will see two different wattage figures – but they will not be operating at the same time.A water heater with two elements, each of which has an energy rating of 4,500 watts, will utilize a total of 4,500 watts when operating at its full capacity.

It is not necessary to add the two wattages together.Using your water heater’s maximum current, figure out what it is.

Identification of the maximum current draw of your water heater is critical since it will aid you in the selection of an appropriate circuit breaker for its overall operating system.The recipe is simple and quick to use.Calculate the power rating of your heater by multiplying it by the operating voltage.If your electric water heater consumes 1,500 watts and is connected to a 120-volt circuit, you would need to divide these two variables by a factor of 2.As a result, you’ll receive a total of 12.5 amperes.Find out what the optimal amperage is for your water heater.

Why is it critical to ensure that the right operating amperage is used?This is due to the fact that the breaker size may not be compatible with the operating voltage of your heater in some instances.When using a 1500-watt heater on a 120-volt circuit, the circuit should have at least 15.6 amps of current.A 15 amp breaker, on the other hand, could be a little inadequate for this design.As a result, a more powerful circuit breaker would be required.A 20-amp circuit breaker would most likely be the most appropriate choice.

Find out what your load breaker’s current rating is for both continuous and non-continuous loads.

This step will provide you with the information you need to determine what breaker size you should purchase.Multiply the existing rating’s value by 125 percent to get the new rating.Homeowners frequently believe that the maximum amp of their water heater corresponds to the same amount of breaker amperage.This is not always the case.Because each circuit breaker can only utilize 80 percent of the total amperage available, it is generally recommended to purchase circuit breakers with a greater amperage rating.For example, a 15-amp breaker has a maximum capacity of 12 amps, but a 20-amp breaker has a maximum capacity of 16 amps.

Circuit breakers and Overcurrent Protection Devices are typically built to handle 100 percent of the rated current in most cases.It is possible to employ a smaller breaker in this situation, which is particularly relevant when dealing with non-continuous loads.Nevertheless, for continuous loads, the 125 percent suggestion is recommended in order to achieve a safe current limitation.As a result, the situation described in instance number three applies here as well.

It is critical to know the load capacity of a circuit breaker..We must make certain that our water heater is suitable with the circuit breaker that we select.Calculate the size of a 30A non-continuous load water heater’s circuit breaker using the following example: When dealing with a 30A non-continuous load, you can utilize a 30 amp circuit breaker.

- It is permissible to give this a current rating of exactly 100 percent.
- Accordingly, 30A non-continuous load equals 30A circuit breaker.
- There is no need for any additional adjustments or calculations.
- Calculate the size of a 28A continuous load water heater’s circuit breaker using the following example: In this scenario, we must multiply a continuous load of 28A by 125 percent in accordance with the NEC’s specifications.
- 35 A is equal to 1.25 times 28 A.
- As a result, the breaker size is equivalent to 125 percent of the continuous load.

## Points To Remember When Choosing A Circuit Breaker Size

- The 125 percent figure is only applicable to continuous loads, not intermittent loads. It is compatible with the vast majority of water heaters that operate on 240-volt circuits.
- If you’re just intending to use your water heater periodically (i.e., not on a continuous basis), a circuit breaker with a 100 percent rating would suffice.
- A 30 amp breaker necessitates the use of a 10 gauge wire. Both devices are suitable for use with 240V heaters.
- It is important to remember that if you have other devices connected to the same circuit as your water heater, you must include their amperage in the overall current demand.
- It is possible to lose the safety function of your breaker if you lower the size of the breaker without updating the entire wiring and circuitry.
- When there is poor wiring, a circuit breaker will trip and break quickly.
- It is possible that a broken thermostat can cause your breaker to use more power, which will eventually cause it to trip.
- Unless the load current is very high, breakers cannot be much greater than the ampacity of the wire.
- It is recommended that you utilize a circuit breaker with a capacity double the amperage of your water heater.
- Always double-check that the circuit breaker you’re installing is compatible with your current panel.

## Conclusion

It might be difficult to determine the correct breaker measurement.It is usually a good idea to consult the specification sheet of your hot water heater when putting together information regarding what size breaker to use with your hot water heater.You will use it as a starting point for your circuit breaker sizing calculations..By following the methods outlined above, you will be able to determine which kind will function most correctly with your water heater.There should be no assumption about the effectiveness of this action plan, which assures that your water heater will not have any electrical problems.

## What size breaker do I need for a 40 gallon hot water heater?

It might also have anything written on the side of it.How much watts are you talking about?It takes 4500 watts to power a typical household 30 or 40 gallon water heater, which is connected to a 30 A circuit breaker.Electric water heaters necessitate the installation of a 240-volt dedicated circuit that serves only the water heater and none of the other appliances or devices on the circuit.In most cases, the circuit wiring will consist of a 30-amp double-pole breaker and 10-2 non-metallic (NM) or multi-conductor (MC) cable.Also, how many amps does a 40-gallon hot water heater need from the power grid?

As a result, a 16 amp heater should be connected and protected by a 20 amp circuit, and a 20 amp breaker should only be able to handle a maximum 16 amp load on the circuit.Overall, a 4500w heater with 240v will draw 4500/240 or 18.75 amps so10 wire and a 25 or 30 amp circuit breaker, depending on the local codes.What size circuit breaker do I need for a 4500w water heater, taking all of above into consideration?The wiring requirements for 3800 watt elements are less strict than the wiring requirements for 4500 watt components.

In order to power a 4500-watt element, 10/2 wire and a 30 amp (220volt) breaker are required.The 3800 may be connected with 12/2 wire and a 20 amp breaker, depending on your needs.For a 50-gallon water heater, what size circuit breaker do I need?

- In order to accommodate a water heater, the usual circuit configuration is 10 conductors with ground (10/2), with a 30 amp circuit breaker for the water heater.

## What Size Breaker Do I Need For A 40-gallon Electric Water Heater? – Almazrestaurant

On the 14th of December, 2021 What is the amperage need for a 40-gallon hot water heater?An typical 40-gallon electric water heater operates at 240 volts and 2500 watts, according to the manufacturer.As a result, by dividing the amperage by 240, we can determine that the amperage is 18.75 amps.Is it possible to utilize a 40 amp breaker to power a hot water heater?In general, the answer is no.This is extremely dangerous, as it has the potential to ignite a fire!

When using 10 gauge wire, the maximum amperage required is 30 amps, but when using 8 gauge wire, the maximum amperage required is 40 amps.What size circuit breaker should be used for a hot water heater?The use of an electric water heater necessitates the installation of a dedicated 240-volt dedicated 30-amp circuit as well as 10-2 nonmetallic (NM) or MC cable.This indicates that the breaker only provides power to the water heater and does not provide power to other appliances.

An electrical circuit breaker rated at 30 amps can run all 4500watt water heaters, regardless of their gallon capacity.

## Related Question What size breaker do I need for a 40-gallon electric water heater?

### What does a 240v breaker look like?

### What is a 40 amp breaker used for?

Breaker with two poles Baseboard heaters are frequently handled by the 15-amp and 20-amp breaks, water heaters and electric dryers are handled by the 30-amp breakers, electric ranges are handled by the 40- and 50-amp breakers, and a big air conditioner or a subpanel is handled by the 70-amp breaker.

### Can you use a 40 amp breaker on 6 gauge wire?

The smallest gauge of wire that may be used with a 40-amp circuit breaker is 8-AWG (American wire gauge). You can use bigger gauge wire (6AWG) to future-proof your electrical system, however using a smaller gauge wire will render your electrical system non-compliant with the National Electrical Code.

### Can I replace a 40 amp breaker with a 50 amp?

There are three responses. In most cases, no. Incorrectly installing a 50A breaker on wire that is only meant to handle 40A is risky and can result in a home fire.

### What size breaker do I need for an electric heater?

To estimate the size of the circuit breaker you’ll need for the heater, multiply the current amount by a factor of 125 percent. A 1500-watt heater on a 120-volt circuit necessitates the use of a 15.6-amp circuit breaker. Because a 15-amp breaker would be insufficient, you’ll need a breaker with the next highest rating, which is 20 amps in this case.

### What size breaker do I need for a 50 gallon electric water heater?

In order to accommodate a water heater, the usual circuit configuration is 10 conductors with ground (10/2), with a 30 amp circuit breaker for the water heater. If you’re going to run cable anyhow, simply run 10 and replace the breaker to make sure it’s done correctly the first time.

### What wire do you use for 50 amps?

According to the American Wire Gauge system, a 6-gauge wire should be used in conjunction with a 50-amp breaker since it is the most appropriate wire gauge. The 6-gauge copper conductor wire has a current rating of up to 55 amps, making it an excellent choice for this circuit application.

### Do electric water heaters require 220?

Voltage requirements must be met. The majority of electric hot water heaters operate on alternating current (AC) voltages ranging from 220 to 250 volts. The hot water heaters require a double circuit breaker that is rated for the amperage draw of the hot water heaters in order to operate at this voltage in a residence.

### What size wire is needed for a 30 amp breaker?

Any circuit rated for 30 amps or more must be constructed with a minimum of 10 ga copper or 8 ga aluminum. The use of larger wire sizes may be necessary for longer routes. In your situation, regardless of how far away your welder is from the breaker panel, you should utilize at least 10 copper.

### Do they make a 25 amp breaker?

The Home Depot offers the QO125CP, a 25-amp single-pole circuit breaker from Square D.

### Is a double pole 30 amp breaker 60 amps?

Single-pole breakers are rated for 120 volts and 15 or 20 amps, depending on the manufacturer.The breakers themselves are quite tiny and only take up a single slot in the breaker box of the home they are installed in.Double-pole breakers, on the other hand, are normally rated for 20 to 60 amps and are used to power big appliances such as electric dryers and stoves that require 240-volt power to operate.

### Do you need a neutral for 240V?

For a 240V load, there is no requirement for a neutral wire. While most 240V appliances contain some 120V loads such as timers or control circuits, this is not always the case, which is why a neutral is typically provided, ″just in case.″ The only time a 240V-only load is often encountered in a domestic context is when a well pump motor is being operated at full speed.

### Is a double pole 20 amp breaker 40 amps?

Is a twin 20 amp breaker capable of handling 40 amps?- Quora is a question and answer website.Nope.The term ″ganged″ refers to the use of two hot wires to safeguard a circuit by joining together two 20 A breakers.Tripping either breaker at 20 A will trip the other, preventing a dangerous situation in which live voltage can be detected in the device after one breaker has been tripped for a safety reason.

### How many amps does 40 watts draw?

A 40-watt bulb has the capability of consuming 0.36 Amps in order to function.

### How many amps can a 40 amp breaker handle?

An electrical circuit with a maximum output of 9,600 watts and a current of 40 amps has been installed. 12,000 watts is equivalent to 50 Amps multiplied by 480 Amps, or 480 amps.

### How much can a 40 amp breaker handle?

Circuit with 40 amps and 240 volts: 40 amps multiplied by 240 volts equals 9,600 watts. Circuit with 50 amps and 240 volts: 50 amps multiplied by 240 volts equals 12,000 watts.

### Is a double pole 50 amp breaker 100 amps?

It has a current of 100 amps. The two 50-amp breakers that are connected together have a combined capacity of 50 amps, not 50 + 50 =! 00! That two-pole 100-amp CB has the capability of delivering either 100 amps at 240 volts or 200 amps at 120 volts, but in response to your query, Chris replied that it delivers 100 amps.

### What size wire is rated for 45 amps?

Wire Size Chart and Amp Ratings Up to a Maximum

SIZE | 60°C (140°F) | 90°C (194°F) |
---|---|---|

AWG or kcmil | TYPES TW, UF | TYPES TBS, SA, SIS |

8 | 40 | 45 |

6 | 55 | 60 |

4 | 70 | 75 |

### Can you use 20 amp breaker 40 amp?

Answer: ″No, do not use a 30 Amp breaker in place of a 20 Amp breaker since the wire is most likely ″sized″ for a 20 Amp load and if a 30 Amp load is utilized with wiring that was designed for a 20 Amp load, the wiring -may- overheat.″

### How many amps can you run off of6 wire?

Size & AMP Ratings

NM, TW, & UF WIRE (Copper Conductor) | SE CABLE (Copper Conductor) |
---|---|

12 AWG – 20 AMPS | 6 AWG – 65 AMPS |

10 AWG – 30 AMPS | 4 AWG – 85 AMPS |

8 AWG – 40 AMPS | 2 AWG – 115 AMPS |

6 AWG – 55 AMPS | 1 AWG – 130 AMPS |

### Can I use a 40 amp breaker for a 40 amp stove?

There are three questions in all. According to the National Electrical Code, any domestic cooking device rated at less than 12 kilowatts can be fed by a 40A circuit.

### Can I add a 40 amp breaker?

Yes, it is possible to get a ″quadplex″ double-stuff that fits in two spots and serves two 240V circuits at the same time.

### Does a water heater need a GFCI breaker?

It is not necessary to include GFCI protection for outlets that are not meant to service wet bar countertop surfaces, such as freezers, ice machines, water heaters, or convenience receptacles that do not provide counter-top surfaces.

### What size breaker do I need?

The basic rule of thumb is that the size of a circuit breaker should be 125 percent of the ampacity of the cable and wire or the circuit that has to be protected by the CB, whichever is greater.Take a look at the following instances that have been solved: The following is an example of how to use the term ″example.″ Consider the following scenario: a 12 gauge wire is utilized for a 20 amp lighting circuit with a 120V single phase power source.

### How many amps does a dryer pull?

Residential electric clothes dryers consume between 7.5 and 30 amps of electricity. 30 amps, on the other hand, is by far the most frequent. In accordance with National Electrical Code (NEC) regulations, 240V dryers must be connected to a dedicated 4-wire circuit (10-3 type NM cable with ground) protected by a 30 amp circuit breaker (or equivalent).

### How many amps does a 50 gallon water heater use?

Electric water heaters with a capacity of 50 gallons consume 4500 watts on average. In a 240-volt electric circuit, 4500 watts is equal to 18.75 amps, hence 4500 watts is equal to 18.75 amps.

### Do electric water heaters need a neutral wire?

As long as the load is straight 240v such as a heat pump, an air conditioner compressor, or a water heater, there is no need for a neutral, and just two hots and a grounding means are required.

### Will 12 2 wire work for a hot water heater?

240-volt grounded connections are required for the majority of electric water heaters built in North America, and this needs a pair of ten copper wires in addition to a ground wire. Copper 12/2 wire is rated for a maximum current of just 20 amps and would be insufficient both in terms of current capacity and in the absence of a ground wire.

### How many breakers can be in a 40 amp sub panel?

An electrical panel with 40A/240V capacity may accommodate up to 10 or more 120V/15A circuits, assuming that they are not all substantially loaded at the same time. It’s possible that you’ll be able to increase the power feed later on. Many panels are available with four spots and eight circuits.

### Can 10 gauge wire handle 40 amps?

″Twelve-gauge wire is good for 20 amps, ten-gauge wire is good for 30 amps, eight-gauge is excellent for 40 amps, and six-gauge is good for 55 amps,″ and ″The circuit breaker or fuse is always sized to protect the conductor,″ according to the National Electrical Code.

## What amp breaker do I need for a 40-gallon water heater?

A 40-gallon water heater should have an average capacity of 4500 Watts and an emf of 240 volts. An appropriate 25 or 30A circuit breaker is therefore sufficient for a 40-gallon circuit breaker. However, for your own safety, we recommend that you purchase a 30A circuit breaker.

## What size breaker do I need for a 240-volt 4500 watt water heater?

The appropriate circuit breaker for this device, which consumes 4500 watts at 240 volts, is either 25 amps or 30 amps in capacity.

## What size breaker should a hot water heater be on?

Electric water heaters necessitate the installation of a 240-volt dedicated circuit that serves only the water heater and none of the other appliances or devices on the circuit. In most cases, the circuit wiring will consist of a 30-amp double-pole breaker and 10-2 non-metallic (NM) or multi-conductor (MC) cable.

## Can I use a 40 amp breaker for a hot water heater?

In general, the answer is no.This is extremely dangerous, as it has the potential to ignite a fire!When using 10 gauge wire, the maximum amperage required is 30 amps, but when using 8 gauge wire, the maximum amperage required is 40 amps.Articles on ThaJokes are based on information that we have gathered from various sources on the internet.When it comes to data collection, we rely on reputable sources.The material provided on this website may be partial or erroneous, despite the ongoing care and attention we devote to its compilation.

Is there anything in this article that you think is wrong or incomplete?If you have any questions, please contact us at thajokes@gmail.com thajokes team

## Most frequently asked questions

### What size wire do I need for a 40-gallon electric water heater?

The wire gauge required for a typical 40-gallon electric water heater is 12 gauge. In that circumstance, you are unable to utilize a 6 gauge or a 10 gauge wire. The current will exceed its capacity, and the wire will begin to melt.

### What is a 40 amp breaker used for?

Breaker with two poles Baseboard heaters are frequently handled by the 15-amp and 20-amp breaks, water heaters and electric dryers are handled by the 30-amp breakers, electric ranges are handled by the 40- and 50-amp breakers, and a big air conditioner or a subpanel is handled by the 70-amp breaker.

### Is there a breaker on a hot water heater?

It is possible to turn off the electricity to your hot water heater in one of two ways: Then, using the electrical plug that came with your water tank, disconnect the electricity to it by withdrawing it from the wall socket. Another option is to switch off the electricity by flipping the circuit breaker (the breaker that is labeled ″water heater″) to the ″OFF″ position on the wall.

### How do I know what breaker is my water heater?

The majority of water heaters will be equipped with a two-pole circuit breaker. This breaker should be labeled on your circuit breaker panel. It will most likely be between 30 and 50 amps in most cases. Disconnect the electricity at the breaker panel.

### What size breaker do I need for a 30 gallon water heater?

For this type of water heater to be considered a continuous load, the branch circuit’s capacity must be computed at 125 percent of the rated ampacity of the circuit. For a 20 Amp OCPD, you will want a 25 or 30 Amp circuit to be able to operate properly.

### correct way to size your water heater wires and Breaker size!

### What size breaker is needed for 240 volts?

According to the National Electric Code, heating circuits are considered continuous loads and, as a result, must be derated by a factor of 25%. (For example, a 20 Amp heating circuit cannot have a load attached that draws more than 16 Amps.) Circuit breakers with one pole are required for 120 Volt heaters; circuit breakers with two poles are required for 240 Volt heaters.

### Is a 30 amp breaker 220v?

Single pole current of 30 amps equals 30 amps at 120 volts. A 30A/120V circuit is extremely unusual in the United States. All households receive two-pole power (mainly 240V, but also some 208V), and all 120V circuits are fed by 20Amp or 15Amp breakers (which are often older).

### What size breaker do I need for an electric range?

Circuit breakers with a capacity of 50 amps and 220 volts are recommended for use with the kitchen stove. This is a deal breaker on two levels. Single breakers are typically capable of carrying 110 volts. Specifically, there must be a dedicated circuit that serves only the stove, with no other appliances or outlets being supplied by that circuit.

### What size breaker do I need for a 240-volt water heater?

Electric water heaters require a 240-volt dedicated circuit in order to function properly. The circuit wiring includes a double-pole breaker rated at 30 amps and nonmetallic wire rated at 10-2 gauge.

### Does Square D make a 25 amp breaker?

Description of the Product It is meant to provide overload and short-circuit protection for your electrical system through the use of the Square D by Schneider Electric QO 25 Amp One-Pole Circuit Breaker. 120/240 VAC and 10,000 air are provided by the device, which is ANSI recognized and UL listed.

### What is a 2 pole 20 amp breaker?

In most cases, a double pole breaker is used with a 240-volt circuit rated at 20-60 amps, and it consists of two hot wires. Each component, including the circuit breaker, wire, and wire insulation, is designed to function as a cohesive system.

### Is there a fuse on electric water heater?

A fuse for the heater is normally located in the main electrical panel, however certain electric water heaters may be fed from a separate fuse or circuit breaker box, depending on the manufacturer.If a fuse blows or a circuit breaker trips, the fuse should be replaced or the circuit breaker should be reset.Within the timer cover are instructions for adjusting the water heater’s timer setting.

### Why would an electric water heater trip the breaker?

Breaker Breaker Breaker Breaker Breaker Breaker The presence of a hot water heater on an electrical circuit might result in the trip of the breaker for three reasons: water leaking on the electrical wires, a problem with the unit’s thermostat, or an issue with the breaker.The most typical reason for this is a dysfunctional thermostat.In this scenario, it is necessary to replace the thermostat.

### How many amps does a electric water heater use?

Bender Bender Bender Bender Bender Bender The presence of a hot water heater on an electrical circuit might result in the trip of the breaker for three reasons: water dripping on the electrical wires, a fault with the unit’s thermostat, or an electrical circuit breaker malfunction.It is most often caused by a faulty thermostat.A new thermostat should be installed in this situation, as previously stated.

### What size wire should I use for a 40 amp circuit?

Wire Size for 40 Amps A wire gauge of 8 will be required for a maximum current of 40 amps. Many electric cooking gadgets, such as electric cooktops, require a minimum of 40 amps.

### What size wire should I use for a 40 amp breaker?

It need an 8-AWG wire to properly run a 40-amp breaker, so be sure you have plenty of it. The installation of a 40-amp circuit breaker on bigger gauge wire, such as a 6-AWG wire, is permissible; however, placing it on a lower gauge wire will be in violation of the code.

### How many amps can a 40 amp breaker handle?

An electrical circuit with a maximum output of 9,600 watts and a current of 40 amps has been installed. 12,000 watts is equivalent to 50 Amps multiplied by 480 Amps, or 480 amps.

### What size breaker do I need for a 50 gallon water heater?

In order to accommodate a water heater, the usual circuit configuration is 10 conductors with ground (10/2), with a 30 amp circuit breaker for the water heater. If you’re going to run cable anyhow, simply run 10 and replace the breaker to make sure it’s done correctly the first time.

### Can I use a 50 amp breaker for a 40 amp stove?

There are two responses. Because of an exemption in the Electrical Code, it is permissible to use a 50A plug and receptacle on a circuit rated for 40A.

## What Size Breaker for a Hot Water Heater: A Breaker Size Solution

Is your electrical water heater tripping the breaker on a regular basis?Is it possible that your heater overheated without you noticing?You have clearly indicated that you are experiencing difficulties in matching your appliance with its safety device based on just a few questions.What size breaker do you recommend for a hot water heater, I hear you ask?For the most part, 30-amps is the common size for heaters.It is important to note that this breaker ampacity does not necessarily work for every water heater available.

There is a formula for determining the proper breaker size, but there are other important aspects to consider, which we will discuss later in this article.

## Understanding Your Water Heater

When purchasing an electric water heater, one of the most common mistakes made by homeowners is failing to verify the amperage rating of the unit.Some heater tanks are just labeled with the voltage and wattage requirements, but not with the ampacity requirements.It is preferable if you obtain your tank specs from the shop or the brand manufacturer directly themselves.The size of your heater must serve as the foundation for establishing the appropriate breaker size.The following are the three criteria you should examine in order to assure your safety: Voltage- The volts provided by your boiler are critical to the operation of a properly functioning circuit.Depending on the size of your tank and the power of your heater, you can connect it to a 220 or 240 Volt outlet.

Wattage- Include the wattage requirements for your heater in your list.Knowing the wattage of your gadget is extremely beneficial if your equipment often consumes a large amount of power due to its tank size and other features.It will assist you in your quest for a proper breaker to manage the situation.Wire Size- Finally, it is critical to understand which cable type is suitable with the breaker size of your hot water heater system.

An mismatched size or broken cables that have been reused might put your heater and breaker at greater risk than they are worth.

## A Breaker Size Solution: What’s the Formula?

If you’re unsure of the amp size you’ll need, doing a simple calculation will provide the answers you need.Knowing the wattage and voltage of your water heater already, all you have to do is follow the Ampere formula, which is I (amps) = P (watts)/V (voltage) (volts).As an example, I have a 3,000-watt heater tank that requires 120-volt power to operate.You must divide your watts by the number of volts in order to obtain its amperage.Solution: P/V = I = P/V I is equal to 3000 watts x 120 volts.I equals 25 amps.

You could be thinking that a gadget with a current of 25 amps necessitates the use of a breaker with the same capacity.After all, it is at this point when overloading and over-tripping begin to occur.The National Electric Code (NEC) stipulates that you must maintain a continuous load of 125 percent of the maximum continuous load at all times.In order to acquire the safe amount for your electric water heater breaker size, you must first complete this step.

Applying the continuous load rule to the previous example, we get 31.25 amps: 125 percent x 25 amps = 31.25 amps.If this is the case, you can purchase the nearest amp size, which is 35 amps.The Square D by Schneider Electric HOM235CP is a highly recommended device for a 35-amp circuit breaker.

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- If you have a 20-amp breaker devoted to your 25-amp water heater, you should anticipate the heater to trip the breaker on a regular basis.
- Allowing enough room for your breaker will allow a power surge to occur without triggering the breaker.
- Check out this video from House Wiring T.V.
- to get a better understanding of how to properly size your water heater wires and breakers!
- – Video on YouTube

## What Size Breaker for 40 and 80-Gallon Water Heater?

Most households utilize a water heater with a tank capacity ranging from 40 to 80 gallons, depending on how much they rely on warm water on a daily basis.You’ll need their wattage and voltage to figure out how many amps breaker for water heater of these tank sizes you’ll require, and then you’ll use the answer from earlier.The typical capacity of a 40-gallon heater is 4500 Watts at 240 Volts, according to the manufacturer.Using the formula I = P/V once more, 4500W/240V Equals 18.75 amps.Then, taking into account the continuous load (125 percent x 18.75A), we’ll arrive at a total of 23.4 amps.According to our response, a 40-gallon water heater requires at the very least a 25-amp breaker, which is the closest match to the amperage amount.

However, I strongly advise utilizing 30-amp breakers because they are a more secure breaker size.For example, an 80-gallon heater fueled by 5500 watts and 240 volts will result in 5500W/240V x (1.25 continuous load) = 28.64 amps while operating at 5500W/240V.This means that a 30-amp dedicated circuit breaker is sufficient.Pro-tip: Although a 30A breaker appears to be insufficient for an 80G tank, putting a 40A breaker will not safeguard the device in the event of an overloaded circuit.

A breaker amperage that is far higher than necessary will not trip when it is required.

## What’s the Correct Wire Size for a Water Heater?

- If the wiring between a water heater and its breaker is mismatched, the connection will not function properly. Check that the amperage of your heater corresponds to the size of the wires on it. You can use the following list as a guide: 20-amp heaters require 12-gauge cable
- 25-amp heaters require 10-gauge wire
- 30/40-amp heaters require 8-gauge wire
- and other big heaters up to 50-amps require 6-gauge wire.

Also, evaluate the size of your water heater’s circuit breaker. Circuit breakers rated at 30 amps, which are often used for big boiler tanks, require a 10-2 nonmetallic or MC cable. It is appropriate for starting loads up to 40 amps and a steady load up to 35 amps with this type of wire.

## Preventive Measures Before Buying a Circuit Breaker

When selecting the appropriate water heater circuit breaker size, it is important to be mindful of the amp differential between the breaker and the water heater.It’s critical that you obtain the correct size.A breaker that is either too large or too little might result in an electrical hazard.If your circuit breaker is too tiny for the amperage needs of your water heater, you should anticipate your CB to trip on a regular basis.Not only that, but too much switching on and off of the heater might result in internal damage to the device.It is not recommended that your water heater share a circuit with other appliances, and you should consider upgrading the circuit breaker if necessary.

A breaker that is capable of handling a larger amperage than designed does not always imply that it is safer for the heater.If the tank experiences a sudden short circuit or overload, your circuit breaker will ignore the occurrence, providing no protection at all.

## Conclusion

Choosing the appropriate size circuit breaker for a hot water heater is not that difficult if you obtain the necessary information.You can determine the right breaker size simply by studying the three wire heater factors — voltage, wattage, and wire size — and how they interact.A basic calculation would also suffice, but keep the breaker size as close as possible to the quantity of your response (the actual amp size of the heater).A 30-amp circuit breaker is commonly used for an electrical water heater, thus a circuit breaker such as the Q230 30-Amp Double Pole Type QP Circuit Breaker will be suitable for the job.

## What Size Wire for a 40-Gallon Electric Water Heater? [Explained]

It is possible that we will receive commissions for purchases made through the links in this post.It is critical to determine the optimal size of wires for a 40-gallon electric water heater before installing them.Short circuits can occur when cables are not properly matched.You don’t want to be in that situation, do you?And then there’s the subject of what size wire to use for a 40-gallon electric water heater.The wire gauge required for a typical 40-gallon electric water heater is 12 gauge.

In that circumstance, you are unable to utilize a 6 gauge or a 10 gauge wire.The current will exceed its capacity, and the wire will begin to melt.It’s important to remember, however, that the size might vary depending on a variety of things.Discover what factors we should take into consideration while selecting a heater wire.

## Why The Sizes of Wires Vary in Different Water Heaters?

Water heaters are available in a variety of sizes and capacities.Wire sizes vary depending on the size of gallons used in each application.The recommended wire size for a 40-gallon electric water heater, for example, is 12 gauge wire.Electric water heaters with a capacity of 50 gallons require wire with a gauge of 6.The gallon size is proportional to the size of the wire.It is possible that the wiring will differ depending on whether the water heater is mounted vertically or horizontally.

Amperage has a role in this as well.For example, the recommended wire size for a 20-amp hot water heater is 12-gauge wire.However, the wire size for a 25-amp hot water heater is 10-gauge wire.

## How to Calculate A 40 Gallon Water Heaters Wire Size

- When it comes to a 40-gallon heater, you can’t just pick any wire size anymore. To begin, you must gather data in order to be able to quantify it. A few examples include: the kind of wire (copper or aluminum), the circuit phase, the circuit voltage, one-half of the entire circuit length, and the total circuit amperage

An typical 40-gallon electric water heater operates at 240 volts and 2500 watts, according to the manufacturer.As a result, by dividing the amperage by 240, we can determine that the amperage is 18.75 amps.It may be approximated as 20 A by using a calculator.Approximately one-half of the overall circuit is 80 meters in length, with a single phase of circuit operation.With the use of a calculator, you can now determine the size of a 40-gallon wire.As a result, you may use a copper wire of 12 gauge for this project.

Using the approach outlined above, you can determine the wire size required for your heater.Want to know how to choose the best wire to use in an electric heater?Congratulations, you’re on the right route!For your consideration, we offer the following suggestions: So now that you have your wire, let’s have a look at why it’s so vital to have the proper length of wire.

## Why Matching The Wire Gauge Is Important For An Electric Heater

If you’re replacing the wires for your heater, you should be aware of the importance of matching the wires correctly.It lessens the likelihood of the wire being heated.Short circuits, on the other hand, will result if you utilize wire that is not matched.How?Suppose you’re utilizing a 40-gallon water heater on a 30-amp circuit with 6-gauge wire.Here’s why: A heater operating at 220 volts generates more current than the circuits can handle.

It begins to melt the items in its immediate vicinity, just like when your shower cable becomes hot!The level of danger is really high.One miscalculation might possibly result in the death of someone.

## Things to Keep in Mind While Replacing Wires of An Electric Heater

- You must first get a permit before performing any work on your water heater wiring. An inspector examines the electrical and plumbing connections to see if they are properly linked or not. To replace the wire, you must first read and understand the installation instructions. The circuit wire is included, as is a double-pole breaker with a 40-amp rating. It also contains non-metallic (NM) cables with a diameter of 10-2.
- The lead of the black circuit wire should be connected to the black circuit wire’s black circuit wire. The white circuit wire should be used to connect the red or white wire’s lead to the circuit wire.
- It is recommended that the white circuit wire be wrapped with black or red electrical tape at the breaker box. The sign represents which wire is the ″hot″ wire and which wire is the ″neutral″ wire.
- A 240-volt circuit allows electricity to flow via both wires (black and white). Consequently, connect the circuit ground wire to the water heater’s green ground screw.

Important: Make certain that you are using the correct size circuit breaker, or else your heater will be damaged. If everything else fails, a professional technician should be contacted to resolve the issue.

## FAQs

Is it possible for me to replace my hot water heater myself?Answer: You can replace a hot water heater on your own if you have some prior knowledge in the field.However, no matter how much experience you have, you must first obtain authorization to do so.Also, before you replace them, make sure you know what to do and what not to do.Is it possible to use a 40A circuit breaker on a 10 gauge wire?Answer: It is not possible to install a 40A breaker on a 10 gauge cable.

For a 40A circuit breaker, you’ll need to utilize wire that’s 8 gauge or smaller.In a 30A breaker, you may utilize wire as thin as 10 gauge.The answer is 4500 watts divided by the number of amps.4500 watts is equal to 18.75 amps, hence the answer is yes.

This is for a 240-volt electric circuit.240-volt electric circuit

## Bottom Line

- That’s all there is to it! You can now figure out what size wire to need for a 40-gallon electric water heater by measuring it. If you wish to change the wires in your heater, you should follow the directions in this page. That’s all there is to it for today! I hope we’ve cleared up any ambiguity about what has to be done. Until then, keep yourself safe and sound! Recent Posts by the Author

Hello, my name is Melissa and I’m writing from Illinois, United States. I’ve been in the furnace operator and tender industry for a number of years now, and I’m passionate about making people’s lives more comfortable in their own residences. Melissa Hawkins’s most recent blog entries (See all of them)

## What Size Breaker Does a Water Heater Need?

Circuit breakers are required for the operation of your electric water heater and gas tankless water heater.Choosing the incorrect size circuit breaker, on the other hand, might result in poor safety and even damage to the water heater.Because of the increased electrical flow via the breaker, the wires are at risk of overheating, resulting in a fire and inflicting damage to your water heater.To ensure electrical safety, the National Electrical Code lays forth rules for the size of circuit breakers and the wire that they are connected to.According to the National Electrical Code, your circuit breaker should always be sized at 125 percent of the load.For safety reasons, it is suggested that you purchase a circuit breaker with more capacity than the electrical load of your electric devices – in this example, your water heater – to ensure that you are not electrocuted.

Electric water heaters require a dedicated 240-volt dedicated 30-amp circuit as well as a non-metallic (NM) or multi-core (MC) cable with a diameter of 10-2.This indicates that the breaker only provides power to the water heater and does not provide power to other appliances.An electrical circuit breaker rated at 30 amps can run all 4500watt water heaters, regardless of their gallon capacity.On occasion, I’ll come across a 4500-watt water heater that has a 20-amp circuit breaker.

The fact that this is theoretically right in terms of size is that it leaves little space for overcurrent and does not comply with the NEC’s 125 percent load standard.The size of the breaker is decided by the wattage of the heating components, not the size of the storage tank.More on it in a moment.

- A water heater with a 4500-watt heating element necessitates the use of a 10/2 wire and a 30 amp (240-volt) circuit breaker to be installed.
- The 3800-watt heating element may be wired using a smaller 12/2 wire and a 20 amp circuit breaker, which will save on wiring costs.

## Sizing Water Heater Breakers

Understanding how a water heater works is essential to determining the appropriate size for the heater to be installed.Electric water heaters operate on alternating current, which ranges from 220 to 250 volts in voltage.You’ll need a double circuit breaker that’s rated appropriately for the amount of electricity the water heater is drawing.For most electric water heaters, we’re looking at a current of between 20 Amp and 30 Amp.When determining the appropriate size based on the power needs, it is also necessary to consider the wire gauge size.The wire gauge size is determined by the amount of current drawn by the heater.

## How Do You Calculate Breaker Sizing?

The power and voltage ratings of your water heater should be checked.The wattage and voltage rating of a water heater are labeled on a sticker that is attached to the thermostat panel.This information may be found around the base of certain heaters.While the majority of household water heaters have a capacity of 4500 watts or less, commercial water heaters can exceed 5500 watts or more.Let’s get down to the nitty gritty of determining breaker sizes using arithmetic.4500 divided by 240 equals 18.75 amps.

18.75 times 125 percent equals 23.4375 amps, which is rounded to 25 amps.If you have a 4500-watt water heater that runs on 240 volts, you should be able to get 18.75 amperes out of it using the conventional division formula.Keep in mind, however, that an electric water heater operates on a continual load.As a result, multiply 18.75 by 125 percent to account for the fact that a water heater operates on a continuous load.

To get 23.4375 amperes, multiply 18.75 amperes by 1.25 to get 23.4375 amperes.When we round that value down to the next tenth, we obtain 25 amp.You’ll need a circuit breaker with a capacity of 25 or 30 amps.

- It is commonly utilized because the minimum rating of 220 volts is greater than the 25 amp rating of the 25 amp breaker.
- 4500/220 = 20.45 amps is the result.
- 20.45 amps multiplied by 125 percent equals 25.568 amps, which is rounded to 30 amps.
- Why not make it twenty?
- After all, it’s closer to 18.75 than 18.75.
- Well, 18.75 amps is only around 94 percent of the total amperage of the breaker.

However, according to the National Electrical Code’s 125 percent guideline, a 20 amp circuit poses a danger of frequent tripping and might cause damage to the water heater.A 25 amp circuit breaker is sufficient; however, most electricians will construct a 30 amp circuit to allow for electrical fluctuations, as described above, to be accommodated.

## What Size Circuit Breaker for Gas Tankless Water Heaters?

Compared to electric tank water heaters, gas tankless water heaters consume less electricity and produce less voltage.Typically, it’s around 12 amps and less than 120 volts in voltage.In order to power the electronic ignition system on gas tankless water heaters, a little quantity of electricity is required.A gas tankless water heater only requires a dedicated single-pole breaker with a 15-amp, 120-volt rating for this reason.

## Should I Have Electric Water Heater or Gas Water Heater?

This decision is based on your geographic location as well as the utility costs in your region.Gas water heaters, on the other hand, are often more expensive to purchase up front but less expensive to operate than electric water heaters.In contrast to gas water heaters, electric water heaters are more energy efficient than their gas counterparts.The cost of gas is 40 percent more than the cost of electricity.As a result, it would be more cost effective to utilize gas.Electric water heaters, on the other hand, are more cost-effective when considering the time saved over time.

Choosing the proper size circuit breaker can be a complicated process.If you’re considering making changes to your home to accommodate electric, gas, or tankless water heating systems, you should consult with a professional first.DISCLAIMER: The information provided on HomeInspectionInsider.com is not intended to be professional guidance.Before beginning any job, you should contact with a competent expert and verify that all necessary permits have been obtained.

It is owned and operated by Hubert Miles who is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by placing advertisements and links on their websites that direct traffic to Amazon.com (hereinafter referred to as ″Amazon.com″ or ″Amazon.com Associates Program″).As an affiliate, HomeInspectionInsider.com participates in a variety of affiliate programs with other websites.Hubert Miles receives a commission for recommending visitors and commerce to these businesses.

## What Size Wire for My Breaker Do I Need?

The size of the wire is critical, regardless of whether you have a 30 amp or a 40 amp breaker.Here’s how to figure out what size wire you’ll require for your circuit breaker.Wire is sold on the basis of a variety of variables.The gauge, often known as the American Wire Gauge (AWG), is the most significant component that will be discussed here (American Wire Gauge).Gauge is a measurement of a wire’s diameter, more precisely its diameter in inches.The AWG system is the internationally recognized standard for this measurement.

Generally, wire gauge is measured in increments of tenths of an inch, with higher values indicating a smaller wire size.When it comes to circuit breakers, precise wire size is critical since it determines how much electrical current can flow through it and how much resistance it has.For the amount of power that will be flowing through the line, you may use the table below to determine roughly what wire size is required.Please keep in mind that the information contained within this article is just meant to serve as general recommendations.

Always seek the advice of a competent electrician, as well as your local electrical codes, if you have any questions.

## Wire Size Ampacity Chart

Using the table below, we can determine what gauge wire you will want for the highest possible amperage (or intensity) of electrical current. It is important to note that the gauge of aluminum and copper wires can sometimes differ. The gauge size shown below is based on the more often seen copper wires.

Maximum Amps | 7 | 10 | 15 | 20 | 30 | 40 | 55 | 70 | 95 |

Gauge (Wire Size) | 18 | 16 | 14 | 12 | 10 | 8 | 6 | 4 | 2 |

Most information on some of the more prevalent amperage sizes may be found in the following sections. Always remember that before using an appliance, you should always verify the amp specifications first. This may be calculated by dividing the

## FAQs

### What size breaker do I need for a 40 gallon water heater? ›

With our answer, a 40-gallon water heater needs at least a **25-amp** breaker, the closest to the amperage value. However, I highly recommend using 30-amps for a safer breaker size.

**What is the standard size wire and breaker size for an electric water heater? ›**

Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a **30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable**.

**What size breaker do I need for a dual 4500 watt water heater? ›**

To sum it up, you can either use a **25-amp or 30-amp** breaker for a 4,500-watt heater. For wiring, you can choose between a 10-gauge wire or a 10/2 wire for this setup.

**What size breaker do I need for a 240 volt 4500 watt water heater? ›**

For a 4500 watt 240 volt water heater, you will need a **25 or 30 Amp** circuit breaker. The majority of electricians will recommend installing a 30 Amp breaker to allow for electrical fluctuations.