How to Install an Electric Tankless Water Heater – Easy Steps

How to Install an Electric Tankless Water Heater

How to Install an Electric Tankless Water Heater

Before starting any job, it is better to know that whether you are capable of doing it or not. You should never rush into a work you know nothing about and it is better not to take part in any task that is out of your skill.

If you are planning to install an electric tankless water heater then you need to be very careful. If you are not an expert or lack any kind of knowledge about it, you should think multiple times before making your mind to do this task. It will be more preferable to hire someone professional in his job.

This could be a matter of life and death if you are naïve in dealing with electric fires that can easily happen to blackout your home. Any accident can happen during the process and no one can take the responsibility except you who’s trying to indulge in some work that is not yours.

But if you are eager to do this on your own, we are here to help you to complete this task in some of the safest ways. All you have to do is to follow each step of this instruction guide carefully and you have to take all preventive measures to avoid any mishap.

Before starting this process you must have answers to these questions because these are the requirements of the installation process.

Is There Enough Power Supply at Your Home?

Before purchasing an electric tankless water heater, make sure that your power supply is compatible with the requirement of the heater. Is your home compatible to install an electric tankless water heater? Because some properties cannot accommodate electric water heaters on their existing circuits.

Do You Have an Idea of Water Pressure?

Do you have some knowledge to read pressure gauges properly? Do you have know-how about water pressure? And do you have a pressure-releasing valve already installed at your home?

If there is no pressure releasing valve installed having water pressure over 150psi, then your home is completely incompatible with an electric tankless water heater. So, it’s better not to buy one.

Do You Have A Permit To Install An Electric Water Heater?

Being a homeowner you can usually install an electric water heater by yourself, otherwise, you will need to do some paperwork for getting permission. A permit is mostly required for a safety inspection. While we are at the installation, check out value tankless heaters.

If you are living on rent then you will have to contact the property owner or landlord. Your electric tankless water heater will be inspected by some officials of your state’s department of building.

This guide will help you to know about the actual standard of tankless water heaters

How to Install An Electric Tankless Water Heater Using Safety Measures

If you’re not confident enough to complete this task by yourself, you should first consider your safety. Doing work that you never did before can cause huge damage to your finance such as medical fees in case of physical damage, fines, and property damage.

So, it is much better to hire a professional to install an electric tankless water heater if you’re not a pro.

Tools & Equipment you need


There could be several tools and equipment required to install a new electric tankless water heater successfully. Here we are mentioning all of them for you:

  • Wrench
  • Pencil
  • Tape measure
  • Needle nose pliers
  • Drill
  • Pipe cutter
  • Measuring Tape
  • Flathead Screwdriver
  • Philips screwdriver


  • Shut off valves
  • Temperature relief valve
  • Pressure relief valve
  • Sandpaper
  • Pipe insulation
  • Teflon tape
  • Mounting screws
  • Anchors
  • Wire + ground
  • Double pole circuit breaker
  • Recirculation pump
  • Piping (Copper/stainless steel flex pipe)

Instruction For Installation

Now as you have all gadgets, tools, and supplies you can start the installation process from now. Here is a complete step by step guide described for you:

Be sure of ample time because this whole process takes 2-3 hours if you are a professional. For someone installing it the first time, it will take a long enough time.

I would highly recommend you to get help from a professional because it’s a very dangerous task for someone who is not sure what is he going to do. It will be better for your safety.

Turn off Circuit Breaker:

This is a life-saving step. Every common person knows that water and electric cables cannot work well together. So turn off all the electric supplies via the circuit breaker.

Shut off the water supply:

It is obvious to turn off the water supply but it would be surprising for you that many people accidentally flooded their homes while doing so and caused huge damage to the property.

Disconnect & Drain old heater:

Unscrew the connection pipes, remove wiring and take out the old wall mounting brackets. Do not damage old wiring and pipes because you will have to replace them and your job will turn from tough to tougher.

Detach front cover:


Carefully remove the front cover while installing the new unit. A screwdriver can help you to do it. Remove all screws and place them somewhere you will find them easily because every screw is important for the proper functioning of the heater.

Remove cover slowly, so you won’t damage the cables connected to the main unit. Do not apply force more than need if you don’t want to break it.

Mount the Unit:

Get help from the instruction guide while mounting the unit. Choose a place that is accessible in case of emergency. Some simple screws will help you in these steps as it is not a difficult step for dexterous people.

Now Connect the Pipes:


After mounting the unit, you have to build hot and cold water connections that will move in and out of the water heater. Mostly these connections are present on the bottom.

A stainless steel flexible pipe will be ideal to do this task for perfectly fitting to the tankless water heater. It will also accommodate flexibility & accessibility in case of high temperature. If somehow this is not available, you can also use PVC or copper for connecting the water supply to the electric tankless water heater.

In most of the instruction guides of the electric water heater, it is mentioned that you should clean the connections on daily basis. For this purpose make sure that these connections are easily detachable.

Install Pressure Valve:

There is no need to install a pressure release valve on the hot water part of the heater unless plumbing authorities ask you to do so. We highly recommend you install a pressure releasing valve on the cold part of the heater for ensuring safety.

Attach flow Valve:

If you are going to do servicing of your electric tankless water heater or trying to make sure that it is working properly, you might need a system that prevents turning off the water supply throughout your home.

It will be better to install a valve that will help you to turn off the flow of water to the heater only without disturbing the entire system of your home.

Bleed The Hot Water:

Before bleeding the hot water system, make sure that you have not switched on the cold water supply and water supply is off. Turn on all the water outlets. Bleeding is a process that helps to remove air from the hot water systems and allows the usage of an electric tankless water heating unit.

Continue this process to work for few minutes then switch off outlets again.

Thoroughly Check All Electrical Connections:

Now carefully look at the electrical connections. Is everything working properly? Are wires connected in the right way? Are wires in their correct terminals?

Never think to skip this process because it is the most important and can be a matter of life and death.

Re-attach Cover:

Now as you have examined the unit, replace the screws you removed from the cover before. Carefully re-attach the cover of the unit.

Turn on Circuit Breaker:

Turn on the switch of your circuit breaker and you’re almost approaching the completion of the process.

Configure the Temperature setting:

After turning on the water heater, configure its temperature settings. If high-power machines are set up to run in a powerful setting, there can be massive burns to a person who might be unsuspecting.

Test Outlets of hot water:

In the end, examine all hot water outlets. Check the suitability of temperature by turning on one outlet at a time. You want your electric water heater to warm water to a certain pleasant level and not scalding hot.

Installation Completed:

The whole installation process is completed now. You went through the safest ways to successfully done this job.

About Zarmish Fakhar

Zarmish has been working as a freelance research writer for 5 years. She is a Zoologist and social media activist as well. She has worked for many reputable newspapers including Dawn. She is a valuable member of Aqua macho as her passion for clean water and eco-friendly products are booming day by day.

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