How Many Amps Does A Tankless Water Heater Use

How many amps does a tankless water heater draw?

Product Specialist at InyoPools Dennis R. Posted on: February 27th, 2017 wayneb56 – I’m a nerd who likes to play video games. The following is the response from the Century Motors representative. “With a question like this, you really need to know the whole story.” Although we do not manufacture the motor, I believe it is a three-phase induction motor. The amount of torque produced will vary depending on the speed selected. At the lowest speed setting and with an acceptable operating voltage, the torque will be more than sufficient to overcome the seal drag.

Because of the possibility of hand injury, I do not believe anyone would recommend attempting this procedure.

published on 2/26/2017 wayneb56 – I’m a nerd who likes to play video games.

In order to move the water, they must generate a significant amount of torque.

  1. I’ve placed a call into the motor representative.
  2. Reply wayneb56 Posted:2/20/2017 Pump pressure is low, and this is causing problems.
  3. When the basket was removed, the impeller bolt was discovered on the bottom.
  4. When I turn on the motor, should I be able to stop it from spinning simply by holding onto the impeller?
  5. posted on: June 3, 2016 Concretedad is a website dedicated to the promotion of concrete.
  6. Then look for any wear on the impeller shaft and seal plate that could cause your shaft seal to fail.
  7. Reply Concretedad Posted:6/2/2016 Although I have replaced my shaft seal, the pump now tightens up so much on the impeller that it becomes unusable.

is an American businessman and philanthropist who lives in New York City.

It appears that the old metal collar did not come off with the old shaft seal when the old shaft seal was replaced.

Reply danny Posted:4/28/2016 I ordered and received a Hayward 1 1/2 horsepower motor and shaft seal for use with a Hayward pump model number SP 2810X15.

The seal appears to be different from the one I removed.

In order to get to the indents (which, I assume, prevent the seal from spinning), I believe I will have to force the seal past the lower metal in order to get to them.

Reply Product Specialist at InyoPools Dennis R.

Posted:5/26/2015 “Jerry” means “Jerry’s” in this context.

However, while the nick in and of itself would not cause an air leak, it does indicate that the inside of the pump had some sort of problem, such as an acorn or a stone lodged inside.

Check that the cover lid and O-ring are in the proper position.

Then you should double-check all of your suction connections.

The putty was then removed in a sequential manner to determine which connection was causing air to enter the system.

I bought a new lid and gasket and installed them.

Could this be the source of the problem?

ReplyIyopools Posted:4/6/2015 impeller – a rotating device that propels a fluid.

Is the shaft rotating when you move the impeller?

Then, starting from the impeller side, rotate the impeller COUNTER-CLOCKWISE to screw it off the shaft.

Thank you so much!

I’m attempting to remove the impeller from the motor.

However, while holding the bolt, the impeller spins in both directions, making it impossible to unscrew.

Reply Product Specialist at InyoPools Dennis R.

Posted:12/21/2014 Pickles are a type of cucumber.

If you give us a call, we’ll put you in touch with a technician at the pump manufacturer.

Thank you so much for the excellent information and video you’ve provided.

I have an older pump that is entirely made of metal (brass, perhaps?).

I have all of the new seals ready to go, and I’ve already removed the impeller and pump from the dead motor.

I have access to a metal ring/piece on the shaft side of the impeller, and the only thing I can think of to do with it is to force it out with a deep well socket and a hammer.


is an American businessman and philanthropist who lives in New York City.

Depending on how old the pump is, you might want to consider purchasing the additional gaskets and shaft seal as well.

Reply Susan Posted:8/11/2014I’m ordering parts for a Hayward Max Flo II to replace an impeller that’s on its way out, but I’m not sure which diffuser gasket to order.

Part 5110-82 is what I’m looking at right now.

Reply Product Specialist at InyoPools Dennis R.

Posted:8/4/2014 Ken – I’d like to thank you for your time.

Reply Ken Posted:8/2/2014 What kind of corrosive effect would touching the ceramic bearing surfaces have?

Excellent article, and thank you for the close-ups.

is an American businessman and philanthropist who lives in New York City.

I would take the motor out and inspect it.

Also, if the threads on the impeller are worn and causing it to wobble on the shaft, it should be replaced.

It is approximately 16 years old, according to my estimates.

I was wondering if the impellar had degraded as a result of the materials that passed through it.

Reply Product Specialist at InyoPools Dennis R.

Posted:5/25/2014 1655 medic – I’m also stumped as to what your three metal gaskets are for.

I would also recommend that you replace your motor shaft seal and gaskets if you haven’t already done so.

Reply medic1655 posted:5/24/2016I was unable to get my Hayward Northstar pump to prime up again.

The result was that I ended up with three metal gaskets that I had no idea where they belonged and couldn’t find them on the schematic, and I still didn’t have a prime.

The impeller was stuck on very tightly, and while I was attempting to remove it, a section of the outer edge snapped off.

TY Reply Product Specialist at InyoPools Dennis R.

Posted:6/11/2013 Smitty (pronounced “Smitty”) is a fictional character created by author Smitty.

Check the voltage coming in from your power source.

This is a common occurrence.

Do you have any recommendations?

is an American businessman and philanthropist who lives in New York City.

Furthermore, if your impeller was clogged, you would not have had good flow at first.

If your water was dirty and you ran it through the filter, it is possible that the filter will need to be cleaned several times in order to remove the fine debris from the filter.

It may be necessary to soak your filter with a TSP solution to help clean out the fine residue that has accumulated in the creases of the filter.

I have a larger filter that is more effective.

It is not the filters, as one of them is six months old and still does the same thing.

Reply Product Specialist at InyoPools Dennis R.

Posted:5/10/2013 a decrease in prime – If you are truly losing prime to the point where your pump is no longer able to suck in water – there is no water flow – you may have a leak in your vacuum hose that needs to be addressed.

Check to see that the hose is completely submerged.

Attach the rest of your hoses but do not connect the cleaner.

Your pump’s prime should be maintained once more.

If you are experiencing prime loss right now, you may have a leak in one of the hoses.

ReplyAnonymous Posted on:5/9/2013When I attach the pool vacuum at the skimmer, my Hayward super pump loses its prime and stops working.

What could the source of the problem be?

is an American businessman and philanthropist who lives in New York City.

I would follow the above instructions to remove the motor from the pump housing.

After that, rotate the impeller.

When the bearings fail, the majority of people replace the motor, but they can also be replaced with the proper tooling.

I drained the pool in preparation for the winter.

The motor is also making a lot of noise.

Think it’s a bad bearing or a bad pump seal, or something else?

is an American businessman and philanthropist who lives in New York City.

It sounds like the bolt has been stripped out.

If the bolt or socket is stripped, you may have difficulty reassembling your pump because the bolt or socket will not hold.

Reply mckyd68 Posted:1/3/2013 I’m attempting to disassemble the motor from my Hayward Super pump.

Do you have any suggestions?

Dennis R.

The post was published on August 27, 2012 by kfcrandy.

Check out our guide on how to clean out an impeller.

Finally, check to see that your skimmer and strainer baskets are free of debris.

Will replacing the impeller be the fix I need to regain the pressure I need to filter the water?

Thanks, Randy Product Specialist at InyoPools will respond.

is an American businessman and philanthropist who lives in New York City.

If you have an old pump that hasn’t been pulled in a long time, it may have corroded shut a little bit in the process.

If something is stuck inside, you may be experiencing another problem.

If you need to put this together right away, have a new housing gasket on hand.

I didn’t try to force anything.

Happy Canucks in response 6/9/2012Your page on how to clean the impeller has just saved me from having to buy a new pump.

I was wrong.

Thank you once more!

I’ve had it for 4 years.

Then he had it for 2 days, and now I have it.

Product Specialist at InyoPools will respond.

is an American businessman and philanthropist who lives in New York City.

It is sufficient to tighten with one’s hand.

Reply Anonymous Is it possible to overtighten the impeller’s connection to the shaft?

How do you tell when you’ve done so? Reply Ian Carucci is a musician from Italy. Posted:5/24/2012 Wow, I was on the verge of buying a new pump until I discovered that I could unclog the propeller in 5 minutes! Thank you very much! Reply

  • 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.

So, how much electricity does a tankless water heater consume? In order to function properly, the average electric tankless water heater requires at least 120 amps. Unfortunately, the overall capacity of the ordinary home is just 200 amps. You’ll have to improve your electrical system to match the increased load demand, which is what it really implies. Not only that, but the increased load would need the installation of a larger, more expensive meter loop and main panel for the residence. Nonetheless, you as the end customer may be responsible for the cost of the wire that connects the neighborhood distribution transformer and the electric meter.

  • You can figure out how many amps your tankless water heater consumes by doing some math on your own.
  • A typical electric tankless water heater may produce power of between 10,000 watts (10 kW) to 40, 000 watts (40, 000 kW) (40 kW).
  • 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.
  • 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).
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.

See also:  How Long Will A Water Heater Last

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?

Rinnai tankless water heaters are, to put it bluntly, among the best in their respective classes. Tankless water heaters, for example, are among the items that the company has proven to be cost-effective and high-efficient time and time again. Water heaters from Rinnai require 120 volts alternating current at 60 Hz and less than three amps.

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?

The majority of the electric tankless hot water heaters that we’ve tested on our site so far have required a dedicated 30-amp, 240-volt circuit breaker to function properly. 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. In most cases, the circuit wiring will consist of a 30-amp double-polebreaker and 10-2 non-metallic (NM) or multi-conductor (MC) cable.

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 ordinary household 30- or 40-gallon water heater consumes around 4500 watts, and, if I’m not mistaken, they are often powered by a 30 A circuit breaker, according to the manufacturer.

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

240 volts may be supplied via a 14/2 cable and a 15 amp double pole breaker, which can power a 3000-watt induction motor.

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?

7500 watts divided by 240 volts equals 31 amps, resulting in the necessity for a 40 amp circuit breaker

Does an electric water heater require a disconnect?

7500 watts divided by 240 volts equals 31 amps, indicating that a 40 amp breaker is required.

Wrapping Up

7500 watts divided by 240 volts equals 31 amps, resulting in the need for a 40 amp breaker.

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

How Many Amps Does a Tankless Water Heater Use

In the event that your heating or air conditioning system requires repair or replacement, we can link you with a dependable and cost-effective specialist in your region. Tankless water heaters are fantastic since they don’t take up much storage space (just a third of a 10-gallon tank), but they’re also great because they save you money on electricity and fuel. Tankless water heaters use less fuel and water than traditional water heaters since they provide hot water on demand. Tankless water heaters, regardless of the type of device you pick (gas or electric), can save you 30 percent to 50 percent on your energy cost by reducing your water usage.

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:

  • Voltage- a large number of manufacturers provide devices that accept 110V, 120V, 208V, 220V, 240V, or 277V. When it comes to amp draw, different electric tankless units have varying demands on their power supply. It doesn’t matter which route you go, you should always make sure that your home can handle the electrical needs of your water heater. Circuit breaker- It is very necessary to have a circuit or circuits that are specifically designed to handle the electric water heater. It may even be necessary to connect the water heater to a separate circuit or circuits in some cases.

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.

It does not rule out the possibility of purchasing an electric tankless water heater. 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?

Because there are several varieties of tankless water heaters to pick from, both gas and electric, it is beneficial to have a general concept of what is available.

  • 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.

  • With the same specifications as the previous unit: 50-degree increase and an exit water temperature of 105 degrees, a 36kW unit rated at 4.9GPM may be used.

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.

The Big Draw of Tankless Electric Water Heaters

Tankless water heaters are an energy-efficient choice for households, and some new versions can lower home water-heating expenses by as much as 50%, according to the Environmental Protection Agency. Tankless heaters provide the ease of on-demand heating since they do not require the usage of a storage tank. Water is heated just when it is needed, rather than being heated and kept for hours as is the case with a standard tank. This decreases the amount of energy lost by sitting water and also ensures that you get a warm shower even if you’re the last person in line.

  1. The majority of them may be wall-mounted either inside or outside the residence.
  2. In addition, with today’s tankless systems, you may manage the temperature of the water using a digital controller.
  3. For example, the EcoSmart tankless water heaters from Rheem will change the amount of energy input required based on the amount of hot water that is required at any given time.
  4. Important to keep in mind when installing a gas-fired tankless heater is that the exhaust and air intake must be vented outdoors, independently from all other appliances, which can make installation more difficult.
  5. To give an example, the EHT team recently investigated the possibility of installing a new tankless heater at one of our project houses.
  6. The downstairs apartment appeared to be an excellent option for an EcoSmart Eco-18 unit, which would have been large enough to accommodate two bathrooms and up to three people.
  7. Why?

In order to install the Eco-18 model, two 40-amp breakers were required, and the unit used 75 amps.

If the tankless unit were to turn on at the same time as another high-amp item, like an air conditioner, the lights in the house would begin to flicker and the electrical supply may become too stressed to keep everything running smoothly, according to him.

“Can you tell me how much it would cost to enhance the electricity capacity of my house?” He responded with “thousands,” and then on to complain about municipal permits, city inspectors, and other issues.

Evaluating the Electrical Supply in a Residence Before purchasing a new electric tankless heater, homeowners should consult with an electrician to ensure that the unit will be a good fit with their home’s electrical supply.

According to the amperage of a home’s electrical service, the number of appliances that may be operated at the same time is limited.

Installation of the EcoSmart Eco-18 model necessitates the use of two 40-amp breakers due to its 75-amp demand.

Essentially, an electrical conduit is a pipe that enters a house from either an underground main electric line or an above-ground service.

As a result, many conduits are larger, and a 2-inch conduit may be capable of carrying a 60-amp service.

The electrical capacity of a service wire that is visible may also be determined by looking at it.

(Caution: Do not come into contact with any exposed wires.) Additionally, the amperage rating of the electrical meter may be written on the face or body of the device.

This label may have been given by the manufacturer or affixed by an electrician during installation.

You will have one primary breaker, which will be the largest of the three, and it should have its capacity marked on or adjacent to it.

The most accurate method of determining the amperage rating is to contact with a professional electrician who will examine your electrical meter as well as the labels on your main breaker or fuse box.

Your electrician should analyze all of the information to establish the amperage rating that is most appropriate.

The lowest number represents the electrical service capacity of your home, and this information can assist you in selecting a tankless electric water heater that is appropriate for your home’s electrical service capacity.

Side Note

Tankless Electric Water Heaters with EcoSmart Technology In addition to providing steady and infinite hot water, each EcoSmart tankless electric water heater is equipped with self-modulating technology, which automatically adjusts the amount of energy input required based on the amount of hot water consumed. When compared to a traditional water storage tank, this allows households to save as much as 50% on water heating expenditures per year. As a result, you may set the heaters to a temperature in increments of 1 degree Celsius and then forget about it.

See also:  How Much Water Heater Installation Cost

The integration of all components, as well as the use of fast connections, are intended to make installation and usage easier.

How many amps does a gas tankless water heater use?

Because the ordinary electric tankless water heater requires at least 120 amps to run, it is insufficient for the average household, which has a total capacity of 200 amps. One whole-house tankless water heater has four 7,000-watt components, resulting in a total electrical demand of 28,000watts from the water heater alone. It is necessary to install wiring and a circuit breaker that can withstand at least 120 amps for this load, which will cost several times as much as the electrical service for a traditional tankwater heater.

40-50 amperes Also inquired about was if a gas tankless water heater required a dedicated circuit.

Unless the manufacturer specifies otherwise, there is no requirement for a separate circuit.

According to, “demand (or tankless) water heaters can be 24 percent to 34 percent more energy efficient than typical storage tank water heaters for residences that consume 41 gallons or less of hot water daily.” With the longer they are in operation, tankless water heaters (ifgas-fired) will save homeowners over $100 per year in energy costs.

How many amps does a tankless water heater draw?

Because the ordinary electric tankless water heater requires at least 120 amps to run, it is insufficient for the average household, which has a total capacity of 200 amps. Because of this, you will need to improve your electrical system in order to meet the increased load demand, which might cost you up to $1,500 in total. A typical tanklessinstallation needs a 40-50 amp circuit breaker for each wire. Also I’d want to know if a tankless water heater requires a dedicated circuit. According to the installation handbook for the tankless water heater that has been selected, an adedicated circuit will be required for use with the unit.

Furthermore, how much electricity does a tankless water heater consume?

For the most part, most residences in the United States have an electric service that is between 100 and 150 amps.

It may seem self-evident that electric-powered tankless water heaters will not function unless they are connected to an electrical source. Natural gas and propane tankless water heaters, on the other hand, are reliant on power and will not function unless there is electricity available.

Water Heater Amps

Making sure that your water heater has the appropriate amperage avoids your home’s electrical system from getting overwhelmed. Get quotations from as many as three professionals! Enter your zip code below to get matched with top-rated professionals in your area. Because there are so many various types of water heaters on the market, it can be difficult to determine how many amps your water heater requires. Your home’s electrical system might soon become overwhelmed if you don’t have enough amperage available.

If you’re thinking about upgrading your water heater, there are a few things to consider when determining how many amps your new water heater will require.

What is the Standard Amperage for an Electric Water Heater?

The majority of electric water heaters operate at 240 volts and 18.8 amps, with a heating element rated at 4,500 watts. A gas water heater consumes less amps than an electric water heater—about 12 amps at 115 volts. The typical home container heater has a 40-gallon tank and is powered by a 30-amp circuit breaker, according to the manufacturer. The actual amount of amperage consumed by water heaters varies across models and is dependent on important factors such as the kind of water heater being used, the type of fuel required, and the capacity of the water heater.

Water Heater Types: Tank vs Tankless

Goffkein may be found at Water heaters are classified into two categories: tank and tankless. The most common type of tank water heater, also known as a storage or container heater, has tanks that physically retain water and heat it on a continuous basis. Coils are built into tankless water heaters, and they heat the water on demand while you’re using it. While tankless water heaters often consume more energy and draw more current than their tank counterparts, they consume less power throughout their lifespan since they only operate when water is required.

Due to the fact that this breaker size is relatively common, it is unlikely that you will need to improve your electrical system in order to manage the required amount of electricity when installing a tank of this size.

If your property is older, you will almost certainly require the services of a professional electrician to improve your system and increase the amount of amperage accessible in your home.

Fuel Type: Electric vs Gas Water Heaters

  • An electric water heater (with a tank) necessitates the installation of a 240-volt circuit with a 30-amp circuit breaker. a 120-amp circuit breaker is required for a tankless electric water heater
  • A gas water heater with a tank requires 30 amps, but a tankless gas water heater necessitates the use of a 120-amp circuit breaker.

Water heaters can be powered by electricity or natural gas, depending on the model. Electric water heaters are often less expensive than gas water heaters, however the expense of maintaining an electric water heater is higher. For a new electric water heater, whether it is a tank or a tankless one, you will almost certainly need to modify your electrical system. Gas water heaters are directly connected to a gas line, which means that they are often more expensive to install at the outset of the project.

In contrast, unless you live in a very old home with limited power capabilities, you will almost never have to alter your electrical system to accommodate a natural gas water heater.

Other Factors That Influence Water Heater Amperage

Because the tank size varies, the overall quantity of power consumed by your water heater is determined by its capacity. Larger tanks will necessitate the use of more power in order to heat all of the water contained inside them. In order to accommodate a single person or a small family (no more than three people), a small 50- to 60-gallon storage tank is sufficient, while a larger 80-gallon tank may accommodate three to four people. In general, you should increase the size of your tank by 10 gallons for every additional person that lives in your home.

The higher the flow rate, the greater the amount of power required by your system.

Energy Efficiency

The energy efficiency of certain units is higher than that of others. The energy efficiency of electric water heaters is generally superior to the energy efficiency of natural gas water heaters. In most cases, tankless water heaters are more energy efficient than traditional tank-type water heaters. Additionally, energy-efficient machines that do not operate continuously, as well as newer ones, will consume fewer amps. The energy efficiency of your water heater is likely to be lower than that of newer models if it’s more than a decade old.

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.

In a similar vein, what size circuit breaker do I require for a 40 gallon electric water heater?

As a result, how many amps does a 50-gallon electric water heater consume?

I’m wondering how many amps a 6 gallon hot water heater consumes. Amps: 16.7 Amps

What Size Breaker for Electric Tankless Water Heater?

Isn’t it frustrating and time-consuming when you buy a breaker and an appliance, only to discover that they don’t work together? It can be difficult and time-consuming to figure out what size circuit breaker to utilize for an Electric Tankless Water Heater (ETWH) at times. It’s also time-consuming because you’ll have to purchase a circuit breaker for each terminal/heating element you use. So, in order to determine the appropriate breaker size, you must first determine the wattage, voltage, and amps of your water heater.

Picking the Perfect Breaker Size

Now, the most dependable and precise approach for determining the proper breaker size for a water heater is to consult the instructions that came with your electric tankless water heater. In addition, you can see the sort of wiring that it has, which is comparable to the amount of breakers that are required for the equipment in question. Is it a 3 x 50 (which implies that there are three heating elements protected by three 50-amp circuit breakers) or a 4 x 40 (which means that there are four 40-amp circuit breakers) circuit breaker?

Keep in mind that the more the number of breakers and the higher the amperage they provide, the greater the electrical current.

If, on the other hand, you are unable to locate the manufacturer’s instructions, you may always resort to the mathematician’s technique.

2. Use the Power formula

Make use of the power equation, P= I x V, from which we may get the following formula to determine the amp size: I= P x V (where I equals amps, P equals watts, and V equals Volts). Because the normal voltage for an ETWH is already 240 Volts, you’ll just need to determine the amount of power input or watts required by your device, which may be found on the device’s specifications sheet or on the water heater itself, to complete your installation. Following the collection of all of the necessary factors for a tankless water heater breaker size, you may proceed to the calculation.

  1. Consider the following scenario: a heating element requires 7600 watts from a 240-Volt circuit.
  2. Although it is possible to use the precise amperage as the breaker size, doing so is not recommended.
  3. If you don’t do this, you run the danger of having an accident since there will be no protection against a power surge.
  4. This safety measure is required because 100 percent continuous loads create heat that is potentially harmful enough to spark a fire at the circuit breaker’s wire connections.
  5. To get the breaker size, multiply 1.25, or 125 percent, by the rated amp of your device, which in this example is 31.7 amps, to obtain the breaker size.
  6. For example, for a safe maximum continuous load on our sample heating element, the breaker you should purchase is 40 amps.

Some water heaters have numerous heating elements, as I previously said, necessitating the use of multiple circuit breakers for each heating element. Take into consideration various heating components, as well as the main heating element.

Electric Tankless Water Heater: How It Works

In addition to the electric water heater breaker size, you may be interested in learning more about how this machine operates, its advantages and disadvantages, and its total power. If you have an old tank water heater, you may already be familiar with the mechanics of a water heater. Tankless and traditional water heaters are not that dissimilar in terms of performance, but there is a significant difference in the amount of electricity they consume. In contrast to conventional heaters, which contain the hot water within as it boils, the ETWH uses electrical components to heat the water that is contained inside the pipelines.

  • Different manufacturers provide extras and premium features in each ETWH that they produce under their own brand.
  • It is straightforward.
  • Once the flow is stopped, the heat elements also come to a halt in their functions.
  • The wattage of the heater (which can range between 10 kW and 40 kW) can be found in the handbook.
  • Many people opt for this type of heater because it provides them with the convenience of having an endless supply of hot water.
  • On the other side, there are disadvantages such as the need for additional equipment, the high cost of maintenance, and the inconsistency of water temperatures.

Is Your Main Breaker Panel Suitable for Your Water Heater

Electric tankless water heater installation requirements include a large main breaker panel for safety reasons, as a result of the several circuit breakers supplying each heating element. So, before you go out and buy a whole new heating equipment, ask yourself: “Do I really need to change my panelboard?” Given the rapid advancement of technology in recent years, 100-amp panels are enough for powering major appliances such as dishwashers and air conditioners. The most recent ETWH available today is incapable of operating at so low an amp.

  • Assume you have three breakers rated at 40-50 amps each, each of which is powering three heating components.
  • 125 percent of the heater’s continuous load might be calculated to determine the size of your primary breaker panel if you do not know how to do so.
  • It is important to note that electric tankless boilers can consume anywhere from 10,000 to 40,000 watts.
  • Therefore: In this case, I=30,000W x 240VI = 125 Amps.
  • It is important to note that a standard 200-amp breaker panel should not be able to manage more than 160 amps at a time.

To be safe, it’s important to talk with your reputable contractor and have him examine the total power input of your ETWH and other electrical equipment before making any decisions. After that, you’ll be able to determine the optimal panel size.


When it comes to determining what size breaker to utilize for an electric tankless water heater, responsibility and meticulous calculations play a significant role. Before you install this heating device, you should pay close attention to the size of your fail-safe device or devices, which will protect your home from electrical and fire accidents in the event of an electrical or fire disaster. The best course of action is to consult with a licensed electrician to identify the most appropriate breaker amp size.

See also:  How Do You Install A Tankless Water Heater

Last but not least, determine the continuous load by multiplying 125 percent by the final amperage received.

How Many Amps Does Water Heater Use?

It is likely that the water heater in your home is one of the most vital but least thought about pieces of equipment in your residence. When shopping for a new water heater, one factor to consider is the amount of electricity the new unit would consume. The amperage is critical in ensuring that you do not overload the electrical system of your present house. The normal amperage for an electric water heater is 18.8 amps at 240 volts and 4500 watts, according to the manufacturer. With 115Volts, the typical use of a gas water heater is less than 12 Amps (US and Canada).

  • In your home, a water heater is most likely one of the most vital yet least thought-about pieces of equipment. Consider the amperage that the new water heater will draw while making your decision on a water heater. The amperage is critical in ensuring that you do not overload the electrical system of your existing residence. 240Volts and 4500W are the typical amperage for an electric water heater, which is 18.8 Amps. When operating at 115V, the typical consumption of a gas water heater is less than 12 Amps (US and Canada). A heater’s specific amperage consumption is determined by a variety of factors, including but not limited to:

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 possible to use a water heater in one of two ways: with a tank that holds water that is continually heated or with coils that heat water as needed. Tank heaters are often referred to as storage heaters or container heaters. These pieces of equipment are the oldest and most conventional types of equipment available. Tankless heaters are also referred to as on-demand heaters in some circles. These units have a more recent design. Storage water heaters, on average, consume less electricity than tankless water heaters.

Given the tankless heaters only operate when necessary, their overall power consumption may be reduced, depending on the amount of actual use they get.

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?

On average, an on-demand heater consumes 120 amps of electricity to operate, which is significantly greater than the consumption of typical heaters, which consume just 30 amps. Many older homes only have 100 to 200 amps of available power, necessitating the installation of a professional electrician to improve the electrical system. During this upgrade, an electrician may recommend that you have a subpanel of circuit breakers installed in your home in order to improve the overall amount of amperage that is available.

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

Heaters that run on gas are typically 25 to 50 percent more expensive than heaters that run on electricity, according to industry standards. However, because they are less expensive to operate, they are more likely to make up for the price difference over the long term. For the ordinary household, a gas water heater will cost around $30 per month on average. Due to the fact that gas units must be connected to a gas line, there may be an additional cost associated with installing such a device for the first time.

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:

  • Is the gasoline type you’re looking for available in your area? What will be the cost of the installation
  • Will the installation necessitate the acquisition of a permit
  • Will you be required to improve the overall amperage of your home? When you switch to this new gasoline type, how much will your monthly payment be?

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.


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.

  1. You should increase the size of your water tank by 10 gallons for each new person that lives in your house.
  2. Your electricity or natural gas utility bill will rise in direct proportion to the amount of power the device consumes at any one moment.
  3. 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.
  4. Using the Tankless Water Heater Sizing Diagram, you may determine which size heater will be most suitable for your needs.
  5. 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.


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.

Electrical Requirements – EcoSmart

It is important to ensure that your house has adequate electrical capacity for your selected model, or that you have made a note of any changes that may be necessary, prior to purchasing an EcoSmart electric tankless water heater. A licensed expert must install your system in order to assure your safety and verify that you are eligible for the limited lifetime warranty. Please see the table below for information on electrical needs.

Model Recommended Breaker Maximum Amperage @240V Recommended Household Electric Service Recommended Minimum Wire Gauge
ECO 36 4 x 40 Amps DP 150 Amps 300 Amps 4×8 AWG
ECO 27 3 x 40 Amps DP 112.5 Amps 200 Amps 3×8 AWG
ECO 24 3 x 40 Amps DP 100 Amps 200 Amps 3×8 AWG
ECO 18 2 x 40 Amps DP 75 Amps 150 Amps 2×8 AWG
ECO 11 1 x 60 Amps DP 57 Amps 125 Amps 1×6 AWG
ECO 8 1 x 40 Amps DP 33 Amps 100 Amps 1×8 AWG
POU 6 1 x 30 Amps 29 Amps 100 Amps 1×10 AWG
POU 3.5 1 x 30 Amps 29 Amps 100 Amps 1×10 AWG

Electric Point Of Use Tankless Water Heaters

Potential Problems with the Installation of Electric Point of Use Water Heaters Point-of-use water heater installation is sometimes complicated by the lack of available power in the bathroom, which is typically provided only by a coded 15A circuit located somewhere near the wash basin. It’s frequently difficult to bring it down to the level of the sink since there are usually tiles, granite, or some other obstruction in the way. If we are successful in getting the power beneath the sink, we will only have a maximum of 15Aamps, which is not too much.

There isn’t much left over to power a hair dryer, for example, which uses around 1500 Watts of electricity.

We would want at least 40Amps, if not more, in order to quickly heat water.

Our neighborhood has a tiered power pricing system; the lowest cost is 12 cents per kilowatt-hour and the highest rate is 50 cents per kilowatt-hour.

A normal house has a 100A electrical service flowing into it from the outside.

In today’s society, this is not nearly enough to meet our needs.

In other words, the electricity is sent straight from the power pole to the residence.

The cost is not covered by the local utility provider.

As an electrical firm, we used to do service improvements on a regular basis.

The air conditioner consumes around 30Amps, and your cooktop consumes another 30Amps, resulting in the eventual trip of the main breaker.

In the home, there is one location where code 20Amp circuit breakers are installed, and that is the garbage disposal in the kitchen, which does not get used very often.

We have come across a number of folks who have purchased those lovely luxury spas without realizing that they require a lot of electricity to function, sometimes as much as 50Amps, which is a pain.

Then they discover that it is prohibitively expensive to obtain an additional 50Amps, which they do not already possess. Just a few weeks ago, I had a customer with a similar situation, and it cost $2500 to get electricity to the spa.

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