## How Many Amps Does Water Heater Use?

I recommend that you use a long barbeque lighter to light this sort of water heater. Other than that, reaching the pilot will be difficult. In order to begin, remove the plate that is located beneath the box with dials on the water heater’s side. Furthermore, an inner plate that must be pushed to the side may be included as a last step. A pipe(s) going to a burner should then be visible. Then, in the box labeledOn/Off/PilotpastPilot, move the knob to the Off position, which is located on the right side.

Turn the water temperature dial to the lowest setting and the On/Off/Pilot dial to the Pilot position.

Hold the barbeque lighter over the end of the pipe near the burner for a few seconds to start the fire quickly.

For about 30 seconds, press and hold thePilotdial downward, and then flip the dial fromPilottoOn Finalize by placing the plates back over the burner hole and adjusting the water temperature dial to the appropriate temperature.

Important: If the burner does not come to life within a few seconds, repeat the entire process.

How energy-efficient is your residence?

- Heater type, fuel type, capacity, and energy efficiency are all important considerations.

It is critical for every homeowner to be aware of the quantity of amps required by their water heater. Making a decision on a water heater may be a difficult undertaking, especially with so many options available. In any case, after you have gained an understanding of the numerous possibilities discussed below, you will be able to make an educated selection.

## Heater Type: Tank or Tankless

It is critical for every homeowner to be aware of the quantity of amps their water heater requires. Making a decision on a water heater may be difficult, especially with so many options available. In any case, after you have gained an understanding of the numerous possibilities discussed below, you will be able to make an educated choice. Storage water heaters, on average, consume less electricity than tankless water heaters. However, because they are continually heating the water within their tank, they may consume more electricity in total than other types of appliances.

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

Water heaters with storage tanks consume less electricity than water heaters with tankless tanks in general.

Due to the fact that they are continually heating the water within their tank, they may, on average, consume more electricity. Given the tankless heaters only operate when necessary, their overall power consumption may be reduced, depending on the amount of actual use they see.

### How Many Amps Does a Tankless Water Heater Use?

Storage water heaters, on average, consume less electricity than tankless water heaters do. However, because they are continually boiling the water within their tank, they may use more total electricity. Tankless heaters only operate when there is a need, resulting in a lower total power consumption based on the amount of actual use.

## Fuel Type: Electric or Gas

The type of fuel that your water heater burns has an impact on the quantity of electricity it requires to function properly. A water heater will often be powered by electricity or natural gas to operate.

### Electric Water Heaters

These sorts of units are less expensive to purchase than gas-powered units, but they are more expensive to operate. This is due to the fact that electricity is generally more expensive than natural gas on a per-unit basis. The energy consumption of an electric water heater is around $42 per month on average. However, because it may be connected to your home’s electrical system rather than requiring the installation of a gas line, this sort of heater is typically less difficult to install.

### How Many Amps Does an Electric Water Heater Use?

An electric heater with a tank necessitates the installation of a 240-volt dedicated circuit with a 30-amp fuse. The fact that this type of equipment requires a dedicated circuit means that an electrical update for your home could be required. A 120-amp circuit breaker is required for a tankless electric unit. When installing this sort of gadget in an older home, the electrical system will need to be upgraded. When it comes to on-demand water heaters, this improvement represents still another additional price in terms of up-front fees.

### Gas Water Heaters

A dedicated 240-volt circuit with a 30-amp breaker is required for an electric heater with a tank. The fact that this type of equipment requires a dedicated circuit suggests that an electrical update for your home could be essential. A 120-amp breaker is required for a tankless electric unit. This sort of gadget will necessitate the replacement of the electrical system in many older residences. With on-demand water heaters, there is still additional price that must be factored into the upfront costs.

### How Many Amps Does a Gas Water Heater Use?

It will take 30 amps of electricity to power a gas water heater with a tank, which normally does not necessitate any changes to the home’s electrical system–even in older homes with just a total of 100 or 200 amps of service. A tankless device that works on gas will necessitate the use of a 120-amp circuit breaker. Because of the high amperage of this type of breaker, many older homes will require electrical system upgrades in order to support this sort of device.

### Should You Change Your Heater’s Fuel Type?

Depending on who you ask, many people believe that if they currently have an electric water heater, it is difficult to switch to a gas one, or that the opposite is true. This isn’t always the case, of course. If you are interested in altering the sort of equipment you now have, all you need to do is consult with an expert. A large number of electricians and plumbers provide free consultations. Find a company in your neighborhood that performs this and just ask them to conduct an evaluation for you.

Some carriers may even be able to offer you with an estimate of the expenses over the phone, if you ask nicely. When considering whether or not to switch the fuel source for your water heater, ask yourself the following questions:

- In the minds of many, replacing an electric water heater with a gas one or vice versa is an impossibility, whether they currently have an electric water heater or not. In other cases, this is not the case. If you are interested in altering the sort of equipment you now use, all you need to do is consult with an expert. A large number of electricians and plumbers provide free consultations to prospective customers. Identify someone in your region who specializes in this and just ask them to conduct an evaluation. In the event that you are thinking about switching to natural gas, you may contact your local gas company to see whether they provide service in your region. It’s possible that some suppliers will be able to offer you with an estimate of charges over the phone. When considering whether or not to switch the fuel used in your water heater, consider the following questions:

Once you have answered the questions above, you will be able to determine whether or not changing the fuel type of your heater is worth the time, effort, and money required. Changing the fuel type of your heater may necessitate more effort and expense during the installation process, but it may be more cost effective in the long run.

## Capacity

It is only when you have hot water when you need it that a water heater is truly beneficial. Regardless of whether the unit has a tank or not, or whether it is powered by gas or electricity, if it is not the proper size for your household’s water needs, it will not function properly. It is also dependent on the capacity of your heater as to how much power it will demand from it. Storage water heaters, for example, come in a variety of tank sizes ranging from 20 to 80 gallons. The larger the tank, the greater the amount of energy required to heat the water.

- You should increase the size of your water tank by 10 gallons for each new person that lives in your house.
- Your electricity or natural gas utility bill will rise in direct proportion to the amount of power the device consumes at any one moment.
- To put it another way, if you want to be able to take a shower while also doing laundry and running the dishwasher, you must add the flow rates of each of these machines together.
- Using the Tankless Water Heater Sizing Diagram, you may determine which size heater will be most suitable for your needs.
- It may seem enticing to get a unit with the highest capacity available, but doing so may demand more amps than your home is capable of providing.

## Energy Efficiency

According to studies, heating a home’s water accounts for around 18 percent of the overall energy consumed by the residence. The efficiency with which your heater utilizes energy will also have an impact on the number of amps the device consumes. Generally speaking, the more energy-efficient a heater is, the more amps it will require to operate. However, even if a more energy efficient heater may take more amperage to turn on, the unit will be in use for a shorter period of time, resulting in a reduction in total energy expenditures.

In the event that your unit is more than 10 years old, it may be time for you to consider upgrading to a more energy-efficient model.

However, because natural gas is often less expensive than electricity, the two units are typically equal in terms of cost.

Keep an eye out for the Energy Star badge while shopping for a new heater. This mark indicates that the device complies with the Energy Star requirements. These gadgets have a tendency to be more energy efficient, which results in their being more cost effective.

## Conclusion

Having access to hot water when you need it is no more a luxury, but rather a need in today’s day and age. As a result, you must locate a unit that is within your budget, both in terms of up-front fees and ongoing operating expenses. It is also critical to evaluate the total quantity of energy that your water heater will use from your home in order to verify that your electrical system is capable of handling the demand.

## How many amps does an electric hot water heater use?

Asked in the following category: General The most recent update was made on June 30, 2020. A water heater of this sort must be treated as a continuous load, which means that the branch circuit must be estimated at 125 percent of the heater’s rated ampacity in order to be considered safe. 4500/240= 18.75 amps, which can be accommodated by a 20 amp OCPD, but 18.75*125 percent = 23.4 amps, which necessitates a 25 or 30 amp circuit. The use of an electric water heater necessitates the installation of a 240-volt dedicated circuit that serves just the water heater and no other appliances or devices.

Therefore, the issue is, what size circuit breaker do I require for a 40 gallon electric water heater?

Aside from that, how many amps does a 50 gallon electric water heater consume?

I’m wondering how many amps a 6 gallon hot water heater consumes.

## 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.

## 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.

Make a note of how much power your heater requires and include it in your list.

It will assist you in your quest for a proper breaker to manage the situation.

Last but not least, it is necessary to understand which cable type is suitable with the breaker size of your hot water heater. 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: I = P/VI = 3000 watts / 120 volts is the formula.

- You could be thinking that a gadget with a current of 25 amps necessitates the use of a breaker with the same capacity.
- The National Electric Code (NEC) stipulates that you must maintain a continuous load of 125 percent of the maximum continuous load at all times.
- Applying the continuous load rule to the previous example, we get 31.25 amps: 125 percent x 25 amps = 31.25 amps.
- The Square D by Schneider Electric HOM235CP is a highly recommended device for a 35-amp circuit breaker.
- Allowing enough room for your breaker will allow a power surge to occur without triggering the breaker.
- to get a better understanding of how to properly size your water heater wires and breakers!

## 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.

However, I strongly advise utilizing 30-amp breakers because they are a more secure breaker size.

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.

A breaker that is capable of handling a larger amperage than designed does not always imply that it is safer for the heater.

## 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.

## How Many Amps Does a Water Heater Use?

As an Amazon Associate, this website receives a commission on eligible sales made via it. For further information, please see this link. Knowing how many amps a water heater consumes is critical if you want to save money on your energy bills. This article concentrates on electric water heaters since they are the most popular type of water heater used in households; however, the formulae may be applied to a variety of other types and designs as well. A 4000 watt water heater operating at 120V consumes around 33.3 amps.

### Water Heater Amp Size Guide

Here is a table showing the most common water heater watt capabilities and how many amps they consume, in case you don’t want to perform any calculations. The same water heater will draw varying amps depending on the voltage, as you can see in the diagram. According on the heater wattage, voltage, and running time, the amps drawn will vary. These power consumption figures are provided just as a point of reference.

Because of variations in manufacturing design, the amount of water used by your water heater may vary. In order to find out how much electricity your water heater consumes, go to the owner’s handbook that was included with your purchase.

Watts | Amps 240V | Amps 120V | Amps 24V | Amps 12V |
---|---|---|---|---|

1000 | 4.1 | 8.3 | 41.6 | 83.3 |

1500 | 6.2 | 12.5 | 62.5 | 125 |

2000 | 8.3 | 16.6 | 83.3 | 166.6 |

3000 | 12.5 | 25 | 125 | 250 |

4000 | 16.6 | 33.3 | 166.6 | 333.3 |

4500 | 18.75 | 37.5 | 187.5 | 375 |

5000 | 20.8 | 41.6 | 208.3 | 416.6 |

The capacity of water heaters is also measured in gallons. The sizes recommended in the following table are based on the number of people who will be using it. The majority of these water heaters have at least 4000 watts of power, with some of the bigger models reaching 5000 watts or higher. As you can see, a 4000 watt water heater will require 416 amps per hour in order to run off of a 12V battery, which is quite a bit. A few ofMighty Max 250ah batteries will be sufficient for the purpose at hand.

These are just for the sake of reference.

For further information, please refer to the owner’s handbook that comes with your device.

Number of Individuals | Size (in Gallons) |
---|---|

1-2 | 30-40 |

2-3 | 40-50 |

3-4 | 50-66 |

5 or more | 66-80 |

Please keep in mind that these size suggestions are just intended to serve as broad guides. Water use varies widely not just from family to household but also from individual to individual, thus take into consideration your particular water consumption when determining what gallon is reasonable. The most accurate approach to determine this is to keep track of how much water each member of your household consumes. Your electricity statement will give you an estimate of the entire amount of energy you have consumed.

### Water Heater Amp Calculation Guide

Always remember that these size suggestions are meant to serve as broad guides, and that they are not binding. Individual water use varies tremendously, not just within a family but also within a single individual, therefore take into consideration your own personal water consumption when determining how many gallons to consume. The most accurate approach to determine this is to keep track of how much water each member of your family consumes. When you receive your electricity bill, you will be able to obtain an indication of how much energy you have used total.

### Can a 240V Water Heater Run on 120V?

Yes, most 240V water heaters may be operated on a 120V power source. The owner’s handbook will provide information on whether or not your vehicle may be towed. Even if it is possible, the amps that are pulled will be different. Let us use the same example as before, a heater with a 4500-watt capacity. The heater consumes 18.75 amps per hour when operating on a 240V system. However, if you were to plug it into a 120V AC outlet, the power consumption would be as follows: 4500 / 120 = 37.5A A 4500 watt water heater consumes 37.5 amps per hour when connected to a 120V system.

Some of these heaters can also be operated at 110 volts, although the amp draw will be larger, despite the fact that the difference between a 110V and a 120V system will be far smaller.

### What Inverter Size Do I Need For a Water Heater?

Yes, the majority of 240V water heaters can be operated on 120V power. The owner’s handbook will provide information on whether or not they can do so. Even if it is possible, the amps that are pulled will be distinct. Take, for example, the same heater from earlier: a 4500-watt unit. The heater consumes 18.75 amps per hour when operating on a 240V system. Although it would use 37.5 amps per hour when connected to a 120V ac outlet, the water heater would draw 4500 watts / 120 = 37.5A when connected to a 120V ac outlet.

The higher the voltage power, the smaller the amount of current drawn is inversely related. It is possible to operate some of these heaters on 110 volts as well, but the amp demand will be greater, albeit the difference compared to running them on a 120V system would be significantly smaller.

### How Many Solar Panels Do I Need to Run a Water Heater?

It is feasible to utilize solar panels in conjunction with a water heater, yes. In order to do so, you will need a huge solar array, in addition to either a battery bank or some type of backup power source. A 4000 watt water heater will require at least 4500 watts of solar electricity, which is equivalent to 12 x 350 watt solar panels. These will occupy a total area of around 210 square feet of floor space. Because there are 5 hours of sunlight each day, there should be enough electricity to keep the heater running throughout the day.

- The greater the number of daylight hours, the longer you can keep the heater running.
- If the heater is not in use for as long as possible, the amount of solar power required will be significantly reduced.
- A refrigerator, air conditioner, and other appliances may be powered by a solar array with a capacity of 4000 watts.
- The second disadvantage is that you will be unable to use the heater if it rains or if the sky becomes overcast.
- As previously demonstrated in the calculations, a number of huge batteries are required to power the whole system.
- As a result of these considerations, a smaller water heater or a solar water heater is preferable for an off-grid setup.

### Are Solar Water Heaters Worth It?

It is preferable to utilize a solar water heater rather than operating water heaters off of solar panels as an option. This should not be mistaken with ordinary electric water heaters that are powered by solar panels or batteries, since they are designed only for the purpose of water heating. Solar water heaters are similar in appearance to solar panels and are mounted on roofs. Built-built collectors attract sunlight into the heater, where it is transformed into energy, which is then utilized to heat the water in the system.

- There are two types of solar water heaters: electric and solar thermal.
- An active direct system transfers hot water to showers and faucets by a direct connection.
- It is necessary to use convection to heat water in passive solar water heaters because they do not have any built-in pumps to do so.
- In a thermosyphon system, water is heated by metallic plates, which are then conveyed from the valves to the faucets through the system.

Passive solar water heaters are less expensive than active solar water heaters since they do not require the installation of sophisticated mechanisms, yet active systems are more efficient. In either case, they are more convenient to operate than a traditional water heater and consume less energy.

### Conclusion

It is preferable to utilize a solar water heater rather than operating water heaters off of solar panels. Contrary to normal electric water heaters that operate on solar panels or batteries, this kind is solely intended for the purpose of providing hot water. On the outside, solar water heaters seem similar to solar panels, and they are mounted on roofs. Light is drawn into the heater by built-in collectors which are then transformed into energy, which is then utilized to heat the water. Unlike other gadgets or appliances, these devices are solely capable of heating water and not supplying energy.

- The hot water is transferred to showers and faucets using an active direct system.
- Thermal convection is used to heat water in passive solar systems, which do not have any built-in pumps to circulate the water.
- Thermal transfer occurs when water is heated by metallic plates and then transferred from the valves to the faucets.
- However, they are both more convenient to operate than a traditional water heater and consume less energy.

## How many amps does a tankless water heater draw?

As an Amazon Associate, I may get a commission on eligible purchases made by you at no additional cost to you. izzysmarthomeguide.com will direct you to Amazon for all of the goods that are recommended on the site. Tankless water heaters have received a great deal of attention in recent years, mostly due to its capacity to offer you with an almost limitless supply of hot water at all times. But, at the same time, you must be fully informed of the qualifications, which include how many amps does an agas tankless water heater use.

- When a tank water heater with 4,500-watt elements is operated on 10 wires and a 30-amp circuit breaker, the overall electrical load is 28,000 watts
- When a whole-house tankless water heater is operated on four, 7,000-watt elements, the total electrical load is 28,000. This load necessitates the installation of cable and a circuit breaker capable of handling at least 120 amps, at a cost that is several times more than that of providing electrical service to a traditional tank water heater.

It takes 10 wires and a 30-amp circuit breaker to operate a tank water heater with 4,500-watt elements; yet, a whole-house tankless water heater with four 7,000-watt elements consumes 28,000 watts in total, with no additional wiring or circuit breakers required. It is necessary to install wiring and a circuit breaker capable of handling at least 120 amps, which will incur a cost that is several times greater than that of providing electrical service to a traditional tank water heater.

Tankless Heater Size (in kW) | Electrical Current (in Amps) |

10 kW | 42 amps |

11 kW | 46 amps |

12 kW | 50 amps |

13 kW | 54 amps |

14 kW | 58 amps |

15 kW | 63 amps |

16 kW | 67 amps |

17 kW | 71 amps |

18 kW | 75 amps |

19 kW | 79 amps |

20 kW | 83 amps |

21 kW | 88 amps |

22 kW | 92 amps |

23 kW | 96 amps |

24 kW | 100 amps |

25 kW | 104 amps |

26 kW | 108 amps |

27 kW | 113 amps |

28 kW | 117 amps |

29 kW | 121 amps |

30 kW | 125 amps |

31 kW | 129 amps |

32 kW | 133 amps |

33 kW | 138 amps |

34 kW | 142 amps |

35 kW | 146 amps |

36 kW | 150 amps |

37 kW | 154 amps |

38 kW | 158 amps |

39 kW | 163 amps |

40 kW | 167 amps |

HVAC Metrix (Heating, Ventilation, and Air Conditioning) The SEER equation is (1 EER100 percent + 42 EER75 percent + 45 EER50 percent + 12 EER250 percent)/100EER = BTUcooling/WHSPF = BTUheating/WCOP = Q (useful heat)/WCOP = Q (useful heat)/WCOP = Q (useful heat)/WCOP = Q (useful heat) (input work) Air conditioning capacity (ACH) = CFM x 60/Area x Heightceiling CFM x h = 4.5 times the total heat (BTU/hr) (std.

- air) Temperature Sensitive Heat (BTU/hr) = 1.1 times the CFM times the time (std.
- air) 1 horsepower is equal to 746 watts.
- o, you might be thinking, how can I determine whether or not my home’s electrical system need an upgrade, right?
- Just so you’re aware, if you’re intending to replace your conventional water heater with a tankless equivalent in your existing house, the installation costs will be significantly more than they would have been if you’d chosen to build the tankless heater from scratch.
- What would be the result of this?
- Low voltage or rapid voltage reductions, on the other hand, are likely to result in dimming or flickering lights, as well as a variety of other issues.

Trust me, I’ve encountered issues such as flashing lights in the past, and after conducting a root cause study, I discovered that connecting 28-kW tankless units in houses with 150-amp services to 10-kW transformers was a clerical error on my part.

## Gas Tankless vs. Electric Tankless: Which model requires up-gradation of a home electric system?

To put it another way, it ALL DEPENDS. But, I’m confident that you aren’t here to accept this response, are you? Let’s conduct some further study and delve a little deeper into the subject. Simply said, based on my knowledge and experience, I can state that a gas tankless system does not often necessitate the upgrade of a home’s electric system, as an electric tankless system does. I believe this is true. Also important to note is that the majority of the gas tankless water heaters that we’ve examined on this blog have earned the Energy Star certification, and many of them are even eligible for federal tax incentives.

## How many amps does a Rinnai tankless water heater use?

To be quite honest, Rinnai tankless water heaters are among the finest in their respective categories. The firm has proven its mettle time and time again by supplying cost-effective, high-efficiency goods, such as tankless water heaters, to its customers. Rinnai Tankless Water Heaters require 120 volts alternating current at 60 hertz and less than three amps to operate.

## Are tankless water heaters 110 or 220?

Tankless water heaters are available in both 110V and 220V types, so you’ll be able to pick one that suits your needs. As a result, you may select the one that is most compatible with your household electrical requirements. Most of the power consumed by the tiny tankless heaters, such as those used at the point of use or beneath the sink, is 110V. The powerful tankless heaters designed for commercial use, on the other hand, require significantly higher voltages to operate.

## How many amps is a 50-gallon water heater?

A common electric tankless water heater operates at a maximum power of 4500 watts. Many of you may not be aware that 4500 watts is equal to 18.75 amps in a 240-volt electric circuit, which is something that many of us take for granted.

## Are most hot water heaters 220?

The majority of electric hot water heaters operate on alternating current (AC) voltages ranging from 220 to 250 volts. When purchasing a tankless water heater for your house that operates on 220 volts, you should be aware that this voltage in a home necessitates the installation of a double circuit breaker rated for the amperage demand of the hot water heater.

## How many BTUsdo I need for atankless water heater?

Due to the significant amount of gas required to heat the water to an appropriate temperature (usually between 150,000 and 200,000BTUs), an average home would require an upgrade in the size of the gas line to accommodate this requirement.

## How many amps does an electric hot water heater use?

In order to heat the water to a proper temperature, the units consume a significant amount of gas, often between 150,000 and 200,000BTUs, which simply implies that an ordinary home would require an upgrade in the size of the gas line.

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

To be honest, the normal household 30- or 40-gallon water heater consumes around 4500 watts, and if my memory serves me correctly, they are often powered by a 30 A circuit breaker.

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

The breaker is designed for 30 amps because this is an entirely resistive load (5500 watts at 240 voltage equals 23 amps), and the wire is 10 AWG because this is a completely resistive load.

Using your example, the elements are strapped for 4500 watts, which results in 18.75 amps of permanent draw. Permanent draw loads should be designed at 80 percent of breaker capacity, therefore a 20 amp breaker is only capable of delivering 16 amps of permanent draw.

## What size breaker do I need for a 3000-watt water heater?

The breaker is designed for 30 amps since this is an entirely resistive load (5500 watts at 240 volts equals 23 amps), and the wire is 10 AWG. Permanent draw loads should be designed at 80 percent of the breaker capacity, in your example, if the elements are strapped for 4500 watts, the draw is 18.75 amps. A 20 amp breaker is restricted to 16 amps.

## What size breaker do I need for a 7500-watt heater?

7500 watts divided by 240 volts equals 31 amps, requiring a 40 amp circuit breaker.

## What size breaker do I need for a 5500-watt water heater?

According to the calculations, a 5500-watt water heater is well within the safe maximum for a 30 amp breaker and a 10-gauge electrical cable. When the temperature of a circuit breaker exceeds its rating, the circuit breaker trips. A 30 amp breaker with a 10 gauge wire has an 80 percent safe maximum of 24 amps, which is equivalent to 24 amps. 24 amps multiplied by 240 volts equals a safe maximum of 5760 watts.

## Does an electric water heater require a disconnect?

An electric water heater does not require any type of disconnect other than a circuit breaker at the main panel or sub panel, nor does it require to be visible, according to the National Electrical Code (NEC).

## Wrapping Up

First and foremost, I’d want to express my gratitude for remaining with us to the very end. Second, I would like to bring your attention to the fact that I, along with my core team, have attempted to answer some of the frequently asked questions, such as how many amps does a tankless water heater draw, in the most accurate and thorough manner that we were able. I hope you find this information useful. And, if you were pleased with our efforts and would like to express your gratitude to us, all you need to do is forward this information to those who could benefit from it.

- Will Vinegar cause harm to a hot water heater if used? This article will cover all of the basics of tankless water heaters. Is it possible to run out of hot water while using a tankless water heater? I’m not sure what size tankless water heater I need. Is it worthwhile to invest in a tankless water heater? Will a single tankless water heater be sufficient for my home? The advantages and disadvantages of tankless water heaters
- How long does it take for a tankless water heater to pay for itself to become profitable?

## How Many Amps Does A Tankless Water Heater Use? (42-167 Amps)

Electric tankless heaters heat water solely with electricity and do not need any other fuel. As we all know, boiling water is a time-consuming and difficult operation. As a result, electric tankless water heaters demand a large amount of electricity current, measured in amps. Tankless water heaters consume a certain amount of electricity. Tankless heaters may draw anywhere from 42 amps to 167 amps, depending on their size. We can compute exactly how many amps a tankless water heater consumes since we understand two important factors:

- The total amount of power, measured in watts. Voltage and power input for electric tankless water heaters can range from 10,000W (10 kW) to 40,000W (40 kW)
- And temperature. All electric tankless water heaters run on a 240-volt circuit in order to limit the amount of electricity consumed.

In order to compute the using the electric power equation (P = IV), we must first express the I (or electric current) in the following way: (amps) = P(watts)/ (volts) (volts) Example: Consider the following scenario: a 30 kW tankless water heater is connected to a 240-volt circuit. In what range of amps does a 30 kW tankless water heater operate at? The electrical power equation is used in the following manner: It is calculated as follows: I(amps)=30,000W/240V = 125 amps A heater of this nature consumes 125 amps (you need several 20-amp or 30-amp breakers for installation).

## How Many Amps Do 10-40 kW Electric Tankless Water Heaters Draw?

All of these estimates are based on the assumption that the heater is powered by a 240-volt circuit.

Tankless Heater Size (in kW) | Electrical Current (in Amps) |

10 kW | 42 amps |

11 kW | 46 amps |

12 kW | 50 amps |

13 kW | 54 amps |

14 kW | 58 amps |

15 kW | 63 amps |

16 kW | 67 amps |

17 kW | 71 amps |

18 kW | 75 amps |

19 kW | 79 amps |

20 kW | 83 amps |

21 kW | 88 amps |

22 kW | 92 amps |

23 kW | 96 amps |

24 kW | 100 amps |

25 kW | 104 amps |

26 kW | 108 amps |

27 kW | 113 amps |

28 kW | 117 amps |

29 kW | 121 amps |

30 kW | 125 amps |

31 kW | 129 amps |

32 kW | 133 amps |

33 kW | 138 amps |

34 kW | 142 amps |

35 kW | 146 amps |

36 kW | 150 amps |

37 kW | 154 amps |

38 kW | 158 amps |

39 kW | 163 amps |

40 kW | 167 amps |

You can correctly determine how many amps your tankless hot water heater consumes by using this amp draw table. After that, you can figure up how many amp breakers you’ll need for the installation process. For those looking for a tankless water heater, you can see our list of the best tankless water heaters right here.

## Electric Water Heaters

The address is PE-208 Fairways Dr., Vicksburg, MS 39183. Dr. Ray Franco, PhD The majority of electric hot water heaters are built to work with 240 VAC power. Heating elements of 4,500 watts are the de facto standard size, which equates to 18.8 amps and 12.8 ohms when measured in amperes. Despite the fact that most electric hot water heaters include both an upper and a lower heating element, they are often configured for non-simultaneous operation rather than simultaneous operation. In other words, only one of the two heating components is “on” at any given moment (see link below).

- According to the National Electrical Code, the smallest size wire necessary for this load is AWG10 (American Wire Gage), with a circuit breaker of either 25 or 30 amps.
- The heating components are encircled by a body of water.
- Each heating element has a thermostat that may be adjusted (the typical temperature range is 120 °F to 160 °F).
- In addition, all electric water heaters must be equipped with a temperature/pressure relief valve that activates when the water temperature reaches 210 degrees Fahrenheit and/or the pressure reaches 150 pounds per square inch.
- For Temperature and Pressure Relief Valves, the ANSI Z21.22 Standard is applicable.

## 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. Circuit breakers and wiring for electrical safety are specified in the National Electrical Code, which defines rules for their sizing and installation.

- 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.
- This indicates that the breaker only provides power to the water heater and does not provide power to other appliances.
- On occasion, I’ll come upon a 4500-watt water heater that has a 20-amp circuitbreaker.
- 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. 240-volt circuit breakers are required for a water heater that has a 4500-watt heating element. A 10/2 wire is required for this water heater. With a smaller 12/2 cable and a 20 amp circuit breaker, the 3800-watt heating element may be connected to the rest of the system.

## 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 and 30 amps. When determining the appropriate size based on the power needs, it is also necessary to consider the wire gauge size.

Element Watts | Breaker Size 120v | Breaker Size 220v | Wire Gauge |
---|---|---|---|

1500 | 15 amp | 15 amp | 14 |

2000 | 20 amp | 15 amp | 14 |

2500 | 30 amp | 15 amp | 14 |

3000 | 30 amp | 15 amp | 12 |

3500 | NA | 20 amp | 12 |

4000 | NA | 25 amp | 10 |

4500 | NA | 30 amp | 10 |

5000 | NA | 30 amp | 10 |

5500 | NA | 40 amp | 8 |

## 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 the breaker sizes. 4500 divided by 240 equals 18.75 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.
- As a result, multiply 18.75 by 125 percent to account for the fact that a water heater operates on a continuous load.
- When we round that value down to the next tenth, we obtain 25 amp.
- It is commonly utilized because the minimum rating of 220 volts is greater than the 25 amp rating of the 25 amp breaker.
- 20.45 amps multiplied by 125 percent equals 25.568 amps, which is rounded to 30 amps.
- After all, it’s closer to 18.75 than 18.75.
- 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.

## 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.

If you want to make changes to your home in order to accommodate electric, gas, or tankless water heating systems, you should consult with a specialist.

Before beginning any job, you should contact with a competent expert and verify that all necessary permits have been obtained.

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.

## How Many Amps Does a Tankless Water Heater Use

This decision is influenced by your geographic location as well as the utility costs in your neighborhood. Although gas water heaters are often more expensive to purchase up front, they are typically less expensive to operate over time. However, electric water heaters are more energy efficient than gas water heaters, which is a plus. When compared to electricity, gas is 40 percent less expensive. As a result, using gas would be more cost-effective. Electric water heaters, on the other hand, are more cost-effective when you consider the time savings over time.

Consider hiring an expert if you plan on making changes to your home to accommodate electric, natural gas, or tankless water heaters.

Before beginning any job, it is recommended that you speak with a competent expert and check local permission requirements.

HomeInspectionInsider.com is also a participant in affiliate marketing programs with other web sites that promote home inspection services.

## How many amps do tankless water heaters need?

Before you can decide between a gas tankless water heater and an electric tankless water heater, you must first gather all of your information. In certain cases, a gas type may be more suitable for your household, whilst an electric tankless unit may be the best option for your home in other cases. Due to the fact that gas-fired devices run on gas (propane or natural gas), it goes without saying that their amperage requirements differ from those of electric-powered equipment. Continue reading for more information.

## How many amps does a gas tankless water heater use?

If you decide to go with a gas model, you’ll need to think about the venting needs as well as the condition of the existing gas line. Some manufacturers provide gas venting “kits,” which you must purchase in order to complete a correct installation. When it comes to amperage requirements, gas-fired tankless water heaters require just a bare minimum of an electrical connection. When purchasing a model, it is important to review the installation requirements for that model.

## How many amps do electric tankless water heaters require?

Given that tankless water heaters only use fuel while you are actively utilizing the hot water, it stands to reason that you will use less fuel and energy overall.

A conventional electric tankless water heater requires at least 120amps to operate, with a total capacity of 200amps for a typical family of four people. If you decide to go with electric tankless water heaters, you should consider the following considerations:

- Given that tankless water heaters only use fuel while you are actively utilizing the hot water, it stands to reason that you will use less fuel and energy. To operate, a normal electric tankless water heater requires at least 120amps of power, with a total capacity of 200amps for a typical home. If you opt to use electric tankless water heaters, you should consider the following points:

The fact that you’ll need to modify your electrical system to accommodate a higher load demand makes reasonable, and you’ll likely find yourself out $1,500 in your pocket rather shortly. Not to mention that special equipment for electric tankless water heaters needs to be placed at the meter base in order for them to work. Increase the budget by $2,000, which makes the electric tankless water heaters appear to be more costly than the standard electric water heaters on the market. For electric tankless water heaters, the breaker size and wire gauge must conform with the municipal, state, provincial, and national electrical codes that apply in your jurisdiction.

- It is important to remember that the wiring must be sturdy enough to ensure a voltage drop of less than 3% while the system is under load.
- Recently released types of classic tank-style water heaters have excelled with their efficiency, achieving an impressive 0.94 energy factor on average.
- If you already have a large number of electrical equipment in your house, it is likely that you will want a more extensive electrical service than you already have.
- All that is required is an update to the electrical service, which should not be done before consulting with a competent electrician for a price.

## Can we get an example for a better understanding?

The fact that you’ll need to improve your electrical system to accommodate a greater load demand makes obvious, and you’ll likely find yourself spending $1,500 in no time at all. In addition, it should be noted that electric tankless water heater installation at the meter base necessitates the installation of certain equipment. To make the electric tankless water heaters appear more expensive than the standard electric tank water heaters, add an additional $2,000 to your budget. When it comes to electric tankless water heaters, the breaker size and wire gauge should be in accordance with the local, state, provincial, and national electrical codes in your area.

It is important to remember that the wiring must be sturdy enough to ensure a voltage drop of less than 3 percent while the system is under stress.

Recent types of classic tank-style water heaters have excelled with their capabilities, achieving a remarkable energy factor of 0.94 in their operation.

You may find yourself in need of an electrical service that is more extensive than you already have if your home already has a large number of electrical gadgets.

The fact that you have a tankless water heater does not rule out purchasing one. To update the electrical service, all that is required is a consultation with a licensed electrician who will provide an estimate.

- A 24kW electric device with a 3.3GPM power output and a temperature increase of 50 degrees Celsius. The temperature of the groundwater is 55 degrees, but the maximum temperature at 3.3GPM will be 105 degrees.

According to the manufacturer, the machine requires a minimum of a 300-amp power supply. It is essential to provide 240V power at 100amps and to install two 60-amp circuit breakers as well as two lines of no.6 copper wire in order to complete the project. We should point you that the device will not be a light load, even when connected to a 300-amp service panel.

- Approximately 300 amps is recommended by the manufacturer for this item. It is essential to provide 240V power at 100 amps and to install two 60-amp circuit breakers as well as two lines of no.6 copper wire. The device will not be a light burden, even when connected to a 300-amp service panel, and we should emphasize this point.

4.9gallon capacity may be achieved by using 150 amps of 240-voltage power, three lines of no.6 copper wire, and three 60-amp breakers. Before installing a tankless water heater in an older home, it is necessary to improve the electrical supply to the home. Not all improvements are pricey, but many of them are time-consuming and take a toll on your wallet’s resources.

## One last thought

When it comes to amperage needs, different kinds of electric tankless water heaters will have varying requirements. Before making an order for an electrical device, be sure that the amperage specifications are correct. In the case of gas models, the amperage needs aren’t as critical as they are in the case of electric ones, but you should still look into the venting possibilities. It is, without a doubt, a lot of labor in both circumstances! We are confident in our ability to link you with a reputable service in your region that can repair, replace, or maintain your heating and air conditioning systems.