How to Install Tankless Water Heater in Bathroom

Last Updated on September 4, 2021 by Michael

How to Install Tankless Water Heater in Bathroom

People are looking for the best water heating solutions for getting hot water in the bathrooms. There are many water heaters that you can install.

However, the best water heater provides energy-saving and water-saving features. That is why the tankless water heater is a popular choice.

The ones with the tank consume more energy and waste a lot of water. So, buying the perfect heater is the start.

Which one to buy and how to install it is another thing. Therefore, you need to know about all the steps for your DIY task. We will guide you about all the things that you need to know.


What is a water heater without a tank?

The electric tankless water heater is the best way to use on-demand hot water. It instantly heats the water without wasting any. Also, it comes with no boiler.

There is no tank for collecting water. The water heater without a tank heats water using flow sensors whenever the water flows through it.

Thus, it only heats when you need hot water using faucets or other appliances. A copper heat exchanger heats water for the bathrooms or the kitchen.

You might be thinking of the benefits of a tank that collects hot water. However, you will benefit more from using one that has no tank.

How to Install Water Heater in Bathroom

Step by Step Guide for installing water heater without a tank

When you want to install a tankless water heater yourself, you need to know all the steps. Also, you will require the right tools and supplies.

So, we will guide you step by step on how to install one.

There is some electrical work that you will have to do first. Many companies offer it to do it for you. However, if you do it yourself, you can save some money.


Tools and supplies that you need

Using the right tools and supplies lets you install the tankless electrical water heater successfully. You can buy these from stores or online shops. The following is the list of tools and supplies.


Step 1: Preparation

One of the daunting tasks is installing a tankless hot water heater on your own. However, this DIY project can become easy if you know what you are doing.

A tankless electric water heater requires a supply of power. Also, it needs an exhaust system. First, read the manual that comes with the water heater without a tank that you have.

Check if you have all the utensils that the manual tells. The package of the water heater will contain most of the tools and supplies that you require.

However, if you feel uncomfortable doing the task, you can always call for professional help.


Step 2: Remove any old water heater

Most of the homes have old water heaters that need repairs. It is why people buy new heating units. Therefore, if you have any faulty one, you can remove it before installing the new one.

First of all, turn off the water supply. Disconnect the old heater unit from the water supply. If it has a tank, empty it first. There will be some water remaining in the supply line.

You can use a bucket to collect any remaining water. The next step is to remove the older unit from the heating source.

Also, disconnect all the power supply lines before removing them. If it is an electric heater, unplug it and shut off the gas supply valve. After this step, you can remove it from the brackets and take it down.


Step 3: Mounting the water heater on the wall

Before you mount the new water heater to a wall, read the instructions given in the manual. Use the hardware that it recommends.

When you mount the electric tankless water heater, make sure it is stable. Check all the support so that it will not fall. It is time to connect it with the waterline.

Also, it might be that you require installing a new one. You can use the hanger brackets that make the pipe remain in its place. Make sure that the water pipes do not touch the walls.

Now, solder all joints of the pipe if required. If you are installing a gas heater, you can run the CSST supply line.

First, shut off the gas line. After shutting the gas line, connect the CSST line with the water heater.

Also, make sure there are no gas leakages after connecting it with the gas line. Always use a gas sniffer to run leakage tests. If there is no gas leakage, you can turn on the gas and light its pilot.

Use the screwdriver or an adjustable wrench to tighten all nuts and bolts. When you install an electric tankless water heater, follow these instructions.

After you connect it with the water lines, connect its plug into the power supply. Power it on and check for hot water through the faucet or bathroom showers. It takes time for the electric heater to heat water when it operates for the first time.

So, be patient. An electric tankless water heater needs three separate and assigned 50A pole breakers.

Thus, you need 200A electrical capacity for the home where you install it. If you do not have the electrical capacity, you can upgrade the electrical panel with the recommended wires and breakers.



Buying the best capacity for the tankless water heater depends on your demand for hot water. The best place for it to install is the bathrooms.

These provide you on-demand hot water and conserve energy. The tools and supplies that you need are available online and at the stores. So, you can check for its permit and install it yourself at home.

Always read the instructions and make sure you have all the tools and supplies.

Remember to shut off the water and gas supply line before installing any water heater in the bathroom. That concludes How to Install Tankless Water Heater in Bathroom.


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