How To Install A Tankless Electric Water Heater

How to Install a Tankless Water Heater

Instructions from a professional on how to remove an old water heater tank, prepare the area for installation of a tankless water heater, and finally install the tankless water heater Because it does not store a huge amount of heated water, a tankless water heater, also known as an on-demand water heater, saves money over a traditional water heater. Essentially, it serves to give hot water on demand, so you won’t have to worry about the shower suddenly being chilly. The process of installing a gas tankless water heater consists of mounting the unit, connecting the gas and water lines, and installing a flue.

Therefore, it may not function well in a family where two or three showers may be operating at the same time, as an example.

It is both small and very efficient to use a tankless water heater.

The following skills are required if you opt to conduct the task yourself: shutting off the water to your house (seeHow to Shut Off the Water to Fixtures) and cutting into and connecting new fittings and pipes to your supply pipes (if you have copper pipes, seeCuttingJoining Copper Pipe).

There is also the need for a gas line and an electrical connection to a 120-volt circuit.

It is not necessary to vent an indoor electric tankless water heater to the outdoors because it is contained within the home.

It may either be hooked into a 240-volt outlet or directly attached to a power source such as a generator.

Tankless Water Heater Preparation

Remember to complete all essential preparations before disconnecting and removing your present water heater; you don’t want to be without hot water for a week or two while you wait for any plumbing, electrical, or vent work to be completed. If you are installing a new gas unit, you should determine whether you need to upgrade your gas meter. Because the unit consumes a considerable amount of BTUs, it is possible that your meter does not have the capacity to feed it in addition to the other gas-using appliances in your home.

  1. Request that the gas provider inspect your new unit to ensure that it is receiving the appropriate amount of manifold pressure for it.
  2. It is better to employ a professional plumber to install a new gas line if you need to replace an existing one.
  3. This will save you time and money.
  4. The fact that a tankless water heater generates a significant amount of condensation and pushes air out with a fan necessitates the installation of category II stainless-steel exhaust pipe with firmly sealed silicon joints, as seen in the second video below.
  5. A damper is an excellent addition for those who live in colder climates since it prevents chilly air from re-entering the home.
  6. Floor drains and utility sinks should be used to dispose of the excess liquid.
  7. In addition to gas, a gas unit requires 120-volt electrical power.
  8. You can watch this wonderful video from This Old House, which will provide you with an excellent explanation of the many stages involved in installing a tankless water heater.
  9. He makes the decision to remove and replace his malfunctioning water heater with a tankless water heater, and he guides us through the entire procedure with his hands on assistance.
  10. Codes demand that a subpanel (which may or may not be included with the unit) be erected next to the unit in order to comply.

Connect the wire to the subpanel and then from the subpanel to the unit, starting at the unit. It is essential that the electricity to the water heater’s circuit is turned off at all times while the work is being performed. +Find a Water Heater Installation Specialist in Your Area

Removing the Old Water Heater

In the majority of circumstances, a new tankless water heater will be installed in lieu of an existing storage water heater. In Ron Hazelton’s video above, he refers to our website for the directions, which are as follows: How to Flush or Drain a Water Heater (with Pictures). In order to remove the old water heater, turn off the valves on the two water lines (one for the input and one for the output) that lead into the existing water heater and disconnect them. To remove and detach the water heater’s lines from the water heater, use channel-type pliers or a pipe wrench.

  1. Drain the tank by opening the drain valve located at the bottom.
  2. Don Vandervort writes for HomeTips.
  3. A segment or two of vent pipe should be disconnected and removed.
  4. If you decide to handle it yourself, cut off the circuit at the service panel and check to be that the power has been turned off completely.
  5. If you require assistance with this project, contact a local water heater professional.

Installing a Tankless Water Heater

Tankless units can be fitted flush against the wall (against the drywall or plaster), or they can be inserted into the wall between the studs. Using a stud finder, identify the studs in the wall where you want to install the unit, and then cut a hole between each of them. Attach the item to the wall in accordance with the manufacturer’s recommendations. Water supply pipes should be routed to the water heater. Make certain that the pipe from the water utility is linked to the inlet and that the pipe flowing to the home is connected to the outlet before starting the project.

  1. You might also want to consider installing a pressure-relief valve.
  2. The water valves should be opened, but not those for the power or gas.
  3. Close the water valves and turn off the water.
  4. Replace the filter, turn on the water valves, turn on the electrical power, and turn on the gas valves if necessary.

Finally, test the equipment to ensure that it is in proper functioning condition. Resource Highlighted: Find a Pre-Screened Water Heater Pro in Your AreaCall today for free estimates from pre-screened water heater professionals in your area: 1-866-342-3263

How to Install an Electric Tankless Water Heater + Requirements

This page may contain affiliate links, so please keep that in mind. If you purchase a product or service after clicking on one of these links, we will get a commission at no additional cost to you. See our product review method in further detail, or read our FTC affiliate disclosure for more information. Purchasing an electric tankless water heater is merely the beginning of the process. Additionally, the item must be correctly put in your home. Unless you have excellent plumbing and electrical expertise, you should hire a qualified professional to complete this project for you (even required in some areas).

Do you want to know all about it?


  • Installation requirements for electric tankless water heaters
  • Power needs
  • Water pressure requirements
  • Permits
  • And other considerations
  • Where to install
  • Tools and equipment
  • And a step-by-step guide on how to install a tankless electric water heater yourself
  • Installing recirculation of water in hot water pipes
  • Insulating hot water pipes

Electric Tankless Water Heater Installation Requirements

What are the prerequisites for putting up an electric tankless water heating system?

Electrical Service Requirements

The installation of a whole-house electric tankless water heater is not appropriate for every residence. This is due to the fact that the amp draw of such a system is far too high. Consider the following example: The Stiebel Eltron Tempra 36 Plus requires three separate dedicated 50A double pole breakers, in addition to a minimum 300A main service recommendation. The average home has a total capacity of 200A, to put this in context: That means you may need to replace your existing electrical service panel with larger cables and breakers, or you may need to install a fully new one, which will cost you a couple of thousand dollars in electrical labor.

  • The Stiebel Eltron Tempra 36 Plus is available for purchase on Amazon.
  • When it comes to amperage needs, a point-of-use (POU) electric tankless water heater should not pose a difficulty.
  • What is the best way to ascertain the current size of your home’s electrical system?
  • Alternatively, you might check for a label in your electrical panel.

Water Pressure Requirements

The majority of electric tankless water heaters are capable of operating at pressures ranging from 30 to 150 psi. It is necessary to install a pressure reduction valve upstream of the water heater when the incoming water pressure is more than 150 psi.


As a homeowner, you are often permitted to complete the installation of your own water heater.

For safety inspections, however, you will still need to get a permit in the majority of states. This is also true when it comes to replacing an aging water heater. It is possible that a plumbing inspector may visit your home and go over the installation to ensure that it was done correctly.

Where to Install

It is necessary to locate an adequate wall to which the water heater may be mounted as the first stage. When installing a whole-house water heater, it makes sense to locate it adjacent to the areas where the majority of hot water is consumed. Using this method, you will be able to obtain warm or hot water more quickly when you open a faucet (it doesn’t matter if you use a recirculation pump; further information is provided below). The main cold water line must be accessible at the same time, which means you must have access to it.

The good news is that electric water heaters do not require any additional ventilation.

Just bear in mind that most electric tankless water heaters must be mounted vertically, with the power and water supply connections facing downward, in order to function correctly.

Generally speaking, you should avoid places where there is a lot of crime.

  • Your water heater would be splashed with water or other liquids on a regular basis
  • Nonetheless, It is possible to experience freezing temperatures.

Additionally hazardous are high levels of wetness and humidity. If you do not follow these instructions, your product warranty will most likely be voided. The following are some of the tools and equipment that you may require to correctly install your new electric tankless water heater: You haven’t made a decision on a system yet? Check out our electric tankless water heaters reviews to pick the best one for your needs and budget! You can learn more about how to correctly size an electric tankless water heater by visiting this page.


  • An adjustable wrench, a pipe cutter, a pencil, and a tape measure are also included. A drill and drill bits, a flat head screwdriver, a Phillips head screwdriver, needle nose pliers, a flat head screwdriver, and a Phillips head screwdriver are also included.


  • Screws and anchors (which should be included with the system)
  • Piping, 3″ or 12″ in diameter (for example, copper pipe or stainless steel flex pipe)
  • Valves for shutting down
  • Temperature and pressure relief valve (T P)
  • Pressure reduction valve (PRV)
  • The following items are required: Teflon tape, sand paper, pipe insulation, double pole circuit breakers, wire and ground, recirculation pump with cross-over valve

It is possible that you will require additional soldering tools and materials.

How to Install an Electric Tankless Water Heater Yourself Step by Step

Before you begin, please keep in mind that this step-by-step installation instruction is simply intended to serve as an illustration. The procedures necessary to set up your individual water heater may differ from those listed above. You avoid this, be sure to read the complete product documentation. Furthermore, faulty installation will almost certainly void the warranty, may shorten the system’s lifespan, and may even result in significant physical damage or death if done incorrectly. So if you are unsure of what you are doing, do yourself a favor and get a certified electrician and plumber to complete the installation for you instead.

Additionally, some manufacturers require that their systems be installed by a licensed contractor in order for the guarantee to be valid; otherwise, the warranty would be void immediately.

Disclaimer: It is strongly suggested that this task be completed by a qualified individual. The installation must also be in compliance with all applicable national, state, and municipal electrical and plumbing regulations.

  1. Please keep in mind that this step-by-step installation instruction is solely intended to serve as an illustration. Depending on your water heater, the procedures necessary to set it up may differ from the ones listed below. As a result, make sure you thoroughly read the product instructions. Furthermore, poor installation will almost certainly void the warranty, may shorten the system’s lifespan, and may even result in significant physical damage or death if not done correctly. In other words, if you aren’t sure what you’re doing, it is best to employ a professional electrician and plumber to do the installation for you. For the sake of a few hundred dollars, it is not worth the risk to perform the work in question. Additionally, some manufacturers require that their systems be installed by a licensed contractor in order for the guarantee to be valid
  2. Otherwise, the warranty would be voided by default. Last but not least, if you have any issues about the installation, you may reach out to technical assistance. Disclaimer: It is highly suggested that this service be completed by a licensed expert to avoid liability issues. The installation must also be in compliance with all applicable national, state, and municipal electrical and plumbing codes.
  • The installation of a shut-off valve before and after the heater is suggested, as this will allow you to switch off the water supply to the unit for maintenance purposes without having to turn off the water supply to the rest of your home. By the way, this is a good opportunity to put in a pressure reduction valve on the cold water side, just in case the incoming water pressure exceeds a specific threshold value ( read more ). A temperature and pressure relief valve (T P) – which should be fitted on the hot water side – should not be necessary unless specifically required by local or state installation requirements
  • Nonetheless,
  1. Remove any air from the pipes and water heater by opening many hot water faucets for a couple of minutes each time they are used. In the meanwhile, you may inspect all of the connections for leaks. Close all electrical outlets
  2. Attention: Refer to the wiring diagram in the handbook for further information! The following stage is to connect the electrical components, starting with the water heater on one side and ending with the electric panel on the opposite. For information on the proper wire size and circuit breaker numbersize, consult the manufacturer’s instructions. To connect small equipment to a single circuit, one set of 6/2 AWG wire and one ground protected by a 50A double pole breaker, for example, can be used in conjunction with a single set of 6/2 AWG wire. Larger units may necessitate the use of two or three different circuits, as well as heavier wire. Cut each wire set to the required length and stripping thickness, then pass it through the bottom holes in the water heater housing and securely attach it to the corresponding slots on the terminal block (see illustration) (check manufacturer instructions for optimal torque). A ground conductor must be connected between the unit’s grounding busbar and the circuit breaker panel for each circuit. Check all of the electrical connections one more time. Check to make sure that you did not mix up the different wire set combinations. Reinstall the front cover of the system. Make sure all of the circuit breakers are turned on
  3. Your electric tankless water heater should be operational at this point. It may be configured according to your tastes, for example, by altering the water temperature to the appropriate level. Open a hot water supply valve. Wait until the temperature has returned to normal. Check the temperature and make any necessary adjustments
  4. Done
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Installation Video

Do you prefer video? You might find the following information useful: Finally, some further observations:


You can find out more about the price of electric tankless water heaters by visiting this page.

Insulation on Hot Water Pipes

Children should be protected against burns by having low-hanging hot water pipes coming from the water heater properly insulated.

Installing Water Recirculation

When you open the kitchen faucet or another outlet, you will not receive quick hot water, even if you have a tankless water heater (also known as an instantaneous water heater). Due to the fact that hot water left in the pipes would ultimately cool down if it is not used, this is necessary. There is, fortunately, a solution to this problem: A recirculation pump is used to circulate water. A recirculation pump returns the cooled-down water to the heater, where it is heated once more. There are several advantages to doing so:

  • You simply have to wait a few seconds before you can start using the hot water. In addition, because you do not have to flush gallons of cold water down the toilet, virtually no water is wasted.

Only a few seconds are required before you may use the hot water. Because you do not have to flush buckets of cold water down the toilet, almost no water is wasted.

  1. Your home already has a recirculation line (also known as a dedicated return line), or you choose to create one, which is a more expensive option. You should install a cross-over valve at the farthest fixture from your heater if at all possible. The hot water line is connected to the cold water line by this one-way check valve. It opens and closes in response to the temperature of the water. The cold water can then be returned to the heater through the cold water line in this manner.

After reading this, you might be thinking: “A recirculation pump in conjunction with an electric tankless water heater would result in a significant loss of energy as a result of the constant pumping and re-heating.” And you were correct, assuming you didn’t utilize any sort of intelligent control to begin with. It is possible to program the pump to function only at specific times of the day using smart controls. These controls may be as simple as a timer, a button, a motion sensor, or a remote.

  1. Available on, the Laing Recirculation Pump with TimerThermostat is a great addition to any home.
  2. A pump with insufficient flow would fail to activate the water heater if the pump was too tiny.
  3. We welcome any questions or comments you may have on how to install a tankless electric water heater in the comments section below.
  4. She is the head of content production and has completely immersed herself in the home water treatment sector, resulting in her becoming an expert in the field herself.
  5. Find out more about.

How to Install a Tankless Electric Water Heater: A 10-Step Guide

An Overview of the Process of Installing or Replacing an Electric Water Heater

  • Step 1: Turn off the circuit breaker and shut off the water supply. Step 2: Turn off the water heater. Step 3: Take off the front cover. Step 4: Install the water heater. Step 5: Join the pipes together. Install the flow and pressure valves in the next step. Burning the hot water system is step 7. In Step 8, you will inspect the electrical components. Activate the circuit breaker (Step 9)
  • Tenth step: check the temperature and outlets

Some problems with water heaters can be repaired. For those who have an old or outdated water heater, it may be necessary to replace it. Although it is possible for a water heater to survive for up to 20 years, the majority of them only last 10 years. If you plan to install a tankless electric water heater yourself, it’s critical that you understand what you’re getting yourself into before you begin. This Might Also Be of Interest to You: Installing or replacing a gas water heater is a simple process.

If you arrive at a job site without the proper tools or a clear grasp of the tasks at hand, it’s likely that you’ll run into problems that will cost you both time and money. This tankless electric water heater installation guide will walk you through every step of the process from beginning to end.

1. Switch Off Circuit Breaker and Water Supply

Immediately before to beginning the job, it is critical that the circuit breaker be turned off in order to guarantee that the electric wires are not powered on while you are working. At this time, you should also switch off the water supply to your home unless you want to risk flooding your home while attempting to replace your present water heater with a new one. Always keep in mind that flooding may cost tens of thousands of dollars in damage, which is why doing the first item on this list is the most critical.

2. Drain Your Old Heater Before Disconnecting It

It is critical that you turn off the circuit breaker before you begin working on the project to guarantee that the electric wires are not energized while you are doing your task. At this time, you should also switch off the water supply to your home unless you want to risk flooding your home while attempting to replace your existing water heater with a new one. Keep in mind that flooding may result in thousands of dollars in damage, which is why the first item on this list is the most crucial of the whole list.

3. Remove the Front Cover

The front cover of the new tankless unit should be carefully removed with a screwdriver before the unit can be installed. Once all of the screws have been removed, store them in a safe location where they will not be misplaced. It is vital to use all of these screws in order for your water heater to perform correctly. Take into consideration the possibility that wires will be connected between the cover and the device. Carefully unplug the cables before removing the lid completely.

4. Mount the Water Heater

Following that, the device will need to be attached to a wall. Make certain that the water heater is not installed in a cluttered or disorganized location of your house or business. Having said that, it’s critical that you have quick access to the unit in the case of an accident or other emergency. Mounting the water heater is straightforward and may be accomplished using a combination of screws and the mount that comes with the unit. Follow the installation instructions that came with your item.

5. Connect Any Pipes

Upon completion of the installation, you will need to connect the pipes that will deliver hot water throughout your home. These are the connectors that will be used to bring water into and out of your water heater. They should be positioned at the bottom of the unit, if possible. When you receive your device, it is possible that you may be given an installation diagram, which you should look to in order to establish where the connections should be made. Stainless steel is the ideal sort of pipe material for a tankless water heater since it is corrosion resistant.

Copper and PVC piping are suitable alternatives to stainless steel piping if you do not have access to stainless steel pipes.

Many instruction manuals recommend that you clean your equipment on a regular basis. Additional Related Articles:

  • How Much Does It Cost to Repair or Replace Your Water Heater
  • How Much Does It Cost to Install a Water Heater
  • How to Check the Element in a Water Heater
  • Don’t Forget to Flush Your Toilet! The following is a 6-Step Guide for Flushing Your Gas or Electric Water Heater: How Do I Turn On My Water Heater
  • I’m Sick of Cold Water? Instructions for Increasing The Temperature of Your Water Heater

6. Install Flow and Pressure Valves

As soon as all of the connections have been completed, it’s time to install the flow and pressure control valves. Flow valves are straightforward to install. In the event that repairs are required, you may simply cut off the water supply to the heater rather than having to shut off water throughout the rest of your property. Pressure valves are only required if and when the local plumbing authority specifies that they are needed. The pressure release valve should be put on the side of the electric water heater that is closest to the “hot water.” To ensure optimum safety, you might also install one on the other side of the heater from the heater.

7. Bleed the Hot Water System

The flow and pressure valves must be installed once the connections have been completed. Valve installation is a breeze with a flow valve. In the event that repairs are required, you may simply cut off the water supply to the heater rather than having to shut off water throughout the rest of your house. It is only necessary to install pressure valves if the local plumbing authority mandates that they be done so. Installation of the pressure release valve on the “hot water” side of a tankless water heater is strongly recommended.

8. Inspect Electrical Connections Before Attaching Cover

It is critical that you take the time to verify the electrical connections to your water heater in order to protect your own safety as well as the safety of everyone else in your family. Check to see that the connections are correctly connected and that the terminals have been placed in the proper locations. After that, the cover should be reattached using all of the screws that were previously used. The installation process is practically complete once the unit’s cover has been properly put on top of the device.

9. Switch Circuit Breaker On

It is safe to turn on the circuit breaker now that you are no longer need to perform any maintenance on the heater directly.

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10. Check Temperature and Test Outlets

Once the water heater has been switched on, you’ll want to adjust the temperature settings on the system. Because these units may get extremely hot when used at their maximum settings, it is suggested that you avoid using them in order to reduce the possibility of burns. This is also a good time to check every hot water outlet in your home, including taps, showers, dishwashers, and laundry washers, to ensure that the temperature is proper and that the water warms up quickly. Turning down the temperature settings may be necessary if the water is becoming too hot to handle.

How To Install an Electric Tankless Water Heater ️ UPDATED 2020

Anyone who has done any type of DIY knows that the most important guideline is to plan ahead of time. You should never get into a job without fully comprehending what it entails. In addition, you should avoid tackling any jobs that are outside of your specific skill set and experience. Are you considering the installation of an electric tankless water heater? Take precautions. BeVERYcareful. If you are not already familiar with the process, you should think carefully before attempting to install your own electric tankless water heater.

  • Rather of doing it yourself, get a professional to do it for you.
  • For starters, no one loves electric fires, but this is a pretty simple method to get one going in no time at all.
  • Please conduct your study, and if you feel that this work is too difficult, enlist the assistance of a professional.
  • However, if you want to proceed in a safe manner, please see the following installation advice.

Let’s start with the most fundamental of the first few stages. Despite the fact that they are not the most interesting, they are unquestionably the most important. For installation in a residential premise, the following are some of the specifications:

Can You Provide the Power?

Consider the following scenario: you walk outside and buy an electric tankless water heating equipment. That’s fantastic. You’ve made a purchase. Did you do any research on it? Have you checked to see if your current property is compatible with it? This occurs thousands of times per day. A consumer acquires an electric tankless water heater but does not care to find out if their home is compatible with it before making the purchase. Some households are unable to generate even half of the electricity necessary to run an electric tankless heater.

Always double-check the specifications before making a purchase, and make certain that everything you buy will meet those specifications.

Do You Know Your Water Pressure?

Does your knowledge of pressure gauge reading make you feel confident in your abilities? Do you know how strong your water pressure is? And, if your water pressure is higher than 150 psi, do you have a pressure release valve installed in your home to protect you? If this is the case, an electric tankless water heater will not work in your house, and you should not waste your money on one. Pressure ranges for most electric tankless water heaters are between 30 to 150 pounds per square inch, although they are rarely higher than that.

Are You Permitted to Install an Electric Tankless Water Heater?

Are you aware that you may be required to obtain a permit? **I mean, obviously, if you’re a renter, you should certainly get in touch with your property manager. Was it ever brought to your attention that you will almost certainly need to have your new electric water heater examined by a representative from your state’s Department of Buildings? When you own your home and the area surrounding it, there should be no problems; all that is required is a little bureaucracy and paper pushing on your part.

For example, in Chicago, a new construction project needs a building permission, but anybody replacing an old heater on a like-for-like basis does not necessitate a building permit.

To protect your own personal safety, please make sure that if you are not comfortable performing such chores or have never done so before, you always hire a professional to complete them for you.

In order to install a tankless electric water heater, you’ll need to have the following equipment and materials on hand and understand how to operate them properly:

  • A drill and drill bits, a Phillips screwdriver, a flat head screwdriver, pliers, a pipe cutter, and an adjustable wrench are all necessary tools. For the new heater, you’ll need screws and anchors to secure it in place (these will be provided with it). Flex pipe made of copper or stainless steel
  • A shut-off valve, a T P (temperature and pressure) valve, sealing tape, and pipe insulation are all required. Electrical circuit breakers with two poles
  • Grounding wire

Instructions for Tankless Water Heater Installation

OK. For those of you who are ready to get started, we’ve included a step-by-step guide that you may refer to for guidance. Make certain that you have enough time. In the average home, it would take a qualified craftsman 2 or 3 hours to install a tankless water heater with a tank. However, for someone who has never done this before, it is preferable to leave more time. We’ll take a look at the procedures that must be followed in order to safely install the new tankless heater. First and foremost, this film is well worth your time.

Installation Instructions for a Tankless Water Heater |Ask This Old House In all seriousness, I’d want to underline how hazardous this activity may be if you aren’t familiar with what you’re getting yourself into.

Again, we recommend that if you are unclear of how to go about such an assignment safely, you call and employ a professional who is knowledgeable in the field.

Turn off all circuit breakers.

Taking this action might very well save your life. The combination of water and live electric lines is, I believe, universally recognized as being undesirable.

Turn off the water supply.

It appears to be self-evident, doesn’t it? However, you’d be amazed at how many individuals flood their houses as a result of undertaking home improvement work. This technique might potentially save you tens of thousands of dollars in damage to your property.

Drain and disconnect the old heater.

In order to remove the old wall mounting brackets, you must first detach the connecting pipes, then remove the wire and last remove the wiring harness. Take care not to damage any of the existing pipes or wiring, or you’ll have to replace them as well, making an already difficult process even more difficult. When removing the front cover of the new unit that you will be installing, exercise extreme caution. This may be accomplished with the use of an appropriate screwdriver. Remove all of the screws from the front of the device and store them somewhere safe so that you don’t lose track of where you put them.

  1. Pulling the top off the heater should be done cautiously since there may be a few connections attached to the main unit, particularly if your heater includes an LCD screen.
  2. This is something you do not want to break.
  3. Make certain that it is in an accessible location that will not be obscured by other goods in storage and that it is easily accessible in an emergency.
  4. This phase should not be too tough for those with good dexterity.
  5. Because most electric tankless water heaters are one-way only, and their connections are often located on the bottom, they are typically located on the bottom.
  6. However, if this option is not accessible to you while installing your heater, it is still feasible to connect the main water supply to the electric tankless water heater using PVC (if it is adequate and can withstand high temperatures) or copper.
  7. If you have used PVC or copper, for example, make certain that the quality of your work and the smoothness of the edges are taken into mind to prevent damage to any threads from occurring.

If you want to do this, we recommend installing an electric heater-specific shutoff valve, rather than a valve that shuts off water flow throughout the whole house at once.

Install pressure valve (if required)

In most cases, you will not be required to install a pressure release valve on the “hot water” side of your tankless electric water heater unless your local plumbing authorities specifically request it. In order to secure your safety and the safety of your family, we highly advise you to install a pressure release valve on the cold side of your heating unit.

Bleed the hot water system.

You should now have the device installed and linked, and you should be good to go. However, make certain that you have not yet turned on the cold-water supply and that the mains water has not been turned on. It is now necessary to bleed your hot water distribution system. Go around your house and turn on all of the hot water faucets. This procedure eliminates any air from your hot water system and prepares it for usage with the tankless electric heating system. Continue this procedure for a few minutes, and then turn off all of the electrical outlets in the house.

Check electrical connections.

Consider taking a long, hard look at your electrical connections. Is the wiring in place and in good condition? Are they seated at the proper terminals? Do you think everything is operating as it should? This step must not be skipped since it might mean the difference between life and death. As soon as you have finished completely inspecting your electric tankless water heating unit, reinstall the screws that you removed from the unit’s cover and gently reattach the cover to the heating unit.

Turn on circuit breakers.

We’re almost there! Put your circuit breakers back in the on position and get ready for action.

Check temperature settings.

After the electric heater is turned on, you will customize it in this section. Be extremely cautious when using these devices since they are extremely strong, and operating them at their maximum capacity can result in severe burns to anybody who comes into contact with them. Finally, make sure that all of your hot water outlets are working properly. Each one should be run separately to ensure that the water temperature is appropriate for your purposes. However, you don’t want everything to be searing hot, and you also want your electric tankless water heater to be able to heat the water to a temperature that’s comfortable.

  1. Lastly, to summarize It is feasible to complete the installation as a do-it-yourself effort.
  2. Tankless heaters are fantastic because they prevent the possibility of a tank bursting into flames.
  3. You should refer to and check your instruction manual at every stage of the installation process while installing an electric tankless water heater.
  4. Don’t make the same mistake that thousands of individuals in the United States do every year.
  5. It has the potential to be the most helpful device in your home, as well as the most cost-effective if it is set up correctly and adjusted to meet your specific needs.

In addition, while selecting electric tankless water heaters, be sure to constantly double-check that the heater you are purchasing is suitable with your residence. Some households are unable to provide even half of the electricity necessary to run one of these machines.


Before commencing the installation procedure, please make sure that you have a copy of the manufacturer’s handbook on your computer. PDF versions of the documents may be obtained by clicking on the following links:

  • Installation manuals for tankless electric water heaters from AO Smith, EcoSmart, Rheem, and Rinnai are available online. Installation Instructions for the Stiebel Eltron Tankless Electric Water Heater

How To Install An Electric Tankless Water Heater

Cabins benefit greatly from tankless water heaters. When compared to typical tank water heaters, they are substantially more compact and energy efficient, which makes them extremely popular outside of the United States. They are also ideal for vacation homes and cabins for many of the same reasons they are popular in the United States. Listed below are a few advantages associated with tankless water heaters:

  • Small footprint and wall-mountability
  • Endless hot water
  • Immediate hot water (no waiting for the tank of water to heat up)
  • More energy-efficient water heating and reduced energy consumption

The following are some of the limitations of a tankless water heater:

  • Large immediate energy needs (electric or gas)
  • High initial cost of the unit/installation
  • Heating constraints dependent on flow and incoming water temperature (which might be substantial)
  • Large total energy requirements.

We were primarily concerned about conserving space. Getting rid of the old, floor standing tank water heater freed up the space we needed to install a new furnace in our little utility room. We were able to get a new furnace in by removing the old, floor standing tank water heater. The modest size and space savings of a wall-mounted tankless water heater are very remarkable — they essentially take up the same amount of space as a suitcase. And, while the space savings are significant, the most significant advantage we have discovered since switching to tankless water heating is the instantaneous, ready-to-use hot water that is there when we arrive.

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Tankless water heaters combined with cabins are a marriage made in heaven!

Tankless Water Heaters vs. Traditional Tank Water Heaters:

Space savings, unlimited hot water, fewer operating costs, and no tank heating delays are some of the benefits of a tankless water heater, which comes at the expense of a higher initial cost and hot water flow constraints.

Tankless Water Heater (On Demand)

  • Small footprint and little space requirements
  • Instant hot water after a time of inactivity – simply switch it on and use it
  • It’s just necessary to pay for what you consume (plus a pilot if you’re using gas)
  • Unit life expectancy is 20 years or more. Purchase and installation will be more expensive. When in use, they generate a significant amount of energy (40 – 180 amps for electric units and large flows for gas machines)
  • Flow (usage) restrictions dependent on the temperature of the source water

Traditional Tank Water Heater (Storage)

  • Large size and space requirements
  • Complete tank must be heated before hot water is provided after a period of non-use – switch on and wait for the entire tank to be heated
  • Large size and space requirements
  • Pay for the full tank to be heated (and reheated)
  • Unit life expectancy is 10–15 years
  • Unit purchase and installation costs are low. When compared to tankless operation, there is a reduction in energy consumption. No matter what the supply temperature is, the temperature remains stable throughout the full tank volume.

Electric vs. Gas Tankless Water Heater Comparison

In most cases, on-demand tankless water heaters are available with one of two fuel options: either natural gas (natural gas or propane) or electricity. When deciding between natural gas and electricity, it is important to consider the prices, performance, installation, and maintenance needs of each.

Electric Tankless Water Heater

  • It is necessary to have one to three 240v 40-60 amp circuits. This system does not require combustion air ducting, exhaust venting, or a gas supply. Install the wiring for the 240v power supply circuit anyplace it is possible
  • Installing less complicated and expensive systems (such as electrical circuits and pipes) In most cases, more efficient (usually 95 percent)
  • When compared to natural gas, electricity is often more costly. It is possible that the heating capacity adjustment range will be restricted to 100° – 140°. Almost completely maintenance-free (save for the replacement of the intake screen).

Gas Tankless Water Heater

  • It is necessary to have a gas supply, combustion air, exhaust venting, and a 120v circuit. It is not necessary to use 240v high amperage circuits. Install at a location where combustion air, exhaust venting, and a 120v circuit can be accommodated. Installing more sophisticated and costly systems (gas line installation, combustion/exhaust venting installation, plumbing installation)
  • Less efficient (usually less than 85 percent efficient)
  • When compared to electricity, gas is often less costly. It is possible to have a greater range of heating capacity adjustment (100° – 180°)
  • Some upkeep is necessary (burner, pilot, venting)
  • Some maintenance is required.

Selecting the Correct Size Tankless Water Heater

It is critical to select the appropriate size water heater. This is especially true with tankless water heaters, which lack a reserve (tank) and are thus obliged to heat the water flowing through them in “real time.” Consequently, tankless water heaters are limited in their ability to heat water as it travels through the unit and are consequently restricted in their ability to heat water as it passes through the unit. Larger units are required for higher flow requirements (large residences, several bathrooms (showers), high flow showers, and so on) as well as for cooler supply water (cold climes, winter use).

  • The majority of manufacturers provide charts to assist you in selecting the appropriate size unit.
  • Installation of these devices, particularly gas ones, might be prohibitively costly.
  • The next sections will walk you through the process of installing my electric tankless water heater.
  • As a result of the possible hazard associated with dealing with high voltage, high amperage circuits, you should not try the electrical aspect of this project unless you are properly qualified.
  • First and first, safety must be prioritized.

Before doing any electrical work, be certain that the main breaker panel is turned off. Consult applicable federal, state, and local statutes. If you have any doubts or are not comfortable with this sort of electrical work, you should consult a competent electrician.

OVERVIEW | How we installed an electric tankless water heater in our cabin utility room – costs, logistics and gas vs. electric comparison.


SUPPLIES LIST | How we installed an electric tankless water heater in our cabin utility room – costs, logistics and gas vs. electric comparison.

Consider the distance between the electrical supply and the plumbing connections, as well as the accessibility for temperature adjustment and maintenance. Consider the distance in plumbing between the heater and the end-of-pipe fittings. Long plumbing runs will result in a greater lag time between the opening of the faucet and the delivery of hot water. Plan the location of the tankless water heater, taking into consideration the convenience of access to the unit, the simplicity of piping, the distance to the end use (the longer the distance, the longer the lag time for hot water), and the ease of wiring.

  • Assemble water heater, supplies and tools
  • Collect the following: a water heater, plumbing supplies, electrical supplies, and tools Electrical work on a water heater is best done using hand tools.

  • Mount water heater
  • Position the heater on the wall in the chosen installation position and note the locations of the mounting holes on the wall. Connect the heater to the wall with the bolts that came with it or other suitable fasteners. Unless otherwise specified by the manufacturer, the unit must be installed in the upright position. When choosing a mounting site for a water heater cabinet, provide at least 6 inches around the cabinet for service and space for the cabinet door opening. Install the device upright, in a dry location that is protected from cold temperatures, and away from children.

  • Plan and Attach Water Connections
    • Water connections should be planned and attached. Before going, make sure you are familiar with the local, state, and federal codes. For servicing (inlet filter screen cleaning), the majority of units require frequent water supply line separation
    • Thus, they should be plumbed with an attachment that is simple to disconnect and reconnect. This is accomplished through the use of flexible stainless steel connectors. These are the same connectors that are used to connect water softeners and other types of water heaters together. I utilized a Falcon Stainless Mega-Flow Super Water-Flex line that was 3/4 inch in diameter. The use of flexible connections for this arm of the water connection also makes the plumbing process for this arm more simpler. Flexible stainless supply water connection and outlet tubing with a detach connector for easy installation and maintenance. The connection for the outlet (hot water) should also have a detach connection to enable for servicing or replacement to be performed. I made use of a brass connection in conjunction with stiff copper tubing. It will be necessary to use Teflon thread tape or paste on all NPT (normal pipe thread) connections. It is not necessary and should not be done to thread treat coupling connections since doing so might limit the compression of the device and prevent correct seating of the brass interface, which can result in leaks. Make as many sweat (solder) connections as possible prior to assembling the plumbing so that the water heater does not suffer any heat damage. This is especially important if the connections are close to the unit connection. When connecting the unit fittings, use a second wrench to tighten them down. When connecting the unit’s inlet and outlet fittings, take care not to cause rotational damage to the unit’s plumbing by using two wrenches to make the connections between the two fittings. Water should be turned on and checked for leaks once all connections have been completed. Prior to making any electrical connections, check for and repair any leaks.

  • Plan and Connect the Electrical Circuits
  • Make sure that the main breaker panel is turned off before beginning any electrical work! Consult state and local statutes and regulations. If you have any doubts, you should consult with a certified electrician who can complete the task. It is necessary to install one to three double pole (240 volt) 40 or 50 amp circuits for your water heater, depending on the type and model of the unit. AWG6 copper wire was necessary for two 50 amp 240 volt circuits in my unit, and for these circuits, I needed two double pole 50 amp breakers (check codes to see whether GFIC protection is required), as well as two double pole 50 amp breakers.

    • Check the wire requirements for your item to ensure that it meets the specific circuit requirements.
    • Take measurements, cut, and connect the conduit circuits that go from your unit to the breaker panel, using the appropriate size conduit (3/4′′ in my instance).
    • According on the length and intricacy of the conduit run, you may find it significantly easier to run the conductors (wires) through the conduit in a sequential fashion as you link the conduits together.
    • Circuits for the Stiebel Eltron unit’s electrical system.
    • Connect the wires to the connections on the unit that correspond to their functions.
    • It is recommended that the connections are labeled with “L1” and “L2” (Live 1, Live 2) or something similar, with the ground connection denoted by a ground symbol ().

    Keep in mind that this is two pole wiring, and that each active conductor is considered “hot.” The grounding system for this item is comprised of a single conductor that is attached to the grounding connector.

  • Close Unit Cover, Turn On Electricity and Power Up Unit
  • Close the water heater lid and secure it with the cabinet screw. Power breakers should be activated. Check the unit’s display to ensure that the power and functioning are correct. Open the hot water faucet to flush the system of any remaining air. Adjust the temperature setting on the unit’s control to the level you wish. Check that the unit is working and that hot water is coming out of the faucet. Temperature should be adjusted as needed.

    IMAGE GALLERY | How we installed an electric tankless water heater in our cabin utility room – costs, logistics and gas vs. electric comparison.

    Plan the location of the tankless water heater, taking into consideration the convenience of access to the unit, the simplicity of piping, the distance to the end use (the longer the distance, the longer the lag time for hot water), and the ease of wiring. Hand tools for the installation of a tankless water heater in the plumbing and electrical systems. Electrical work on a water heater is best done using hand tools. Install the device upright and in a safe, dry location on a wall that is easily accessible.

    • Flexible stainless supply water connection and outlet tubing with a detach connector for easy installation and maintenance.
    • This item requires two 240v, 50 amp circuits to function properly!
    • a copper conductor conduit for the water heater, which has six copper conductors.
    • In this photo, you can see the conductor connections within the device, which has two 240v 50amp circuits.

    FOLLOW UP | How we installed an electric tankless water heater in our cabin utility room – costs, logistics and gas vs. electric comparison.

    08/06/2016 Since installing the Stiebel Eltron Tempra 24 plus in our central Minnesota cabin about two years ago, we have been really pleased with its performance. Despite the fact that our cabin has just one bathroom and that the piping for the shower is 3/4 inch and the shower head is set up for maximum flow, the demand for a shower may be quite strong at times. It has been our experience that setting the unit to around 130° in the winter and approximately 120° in the summer produces ideally hot showers and supplies us with all of the hot water we require.

    As a result of its location in our warm mechanical room, our reservoir tank’s water ultimately warms up to the temperature of the room in which it is housed.

    The ultimate result is a change in the temperature of hot water coming out of the faucet.

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