Tankless Water Heater Installation: Easy To How Guide

Tankless Water Heater Installation: Easy To How Guide

Congratulations on the purchase of your new Tankless water heater unit. Whether you have been using a tank storage water heater before or using a water heater is an entirely new experience for you, there is no doubt that you will enjoy the additional luxury a tankless unit brings.

If you are a DIY enthusiast you might want to install your tankless water heater by yourself. A quick word of caution though, the installation process of a tankless unit is not exactly straightforward. It is not your typical DIY project and you might want to leave it to the experts.

Installing the water heater on your own comes with some downsides. It might void the warranty. That’s not to mention the fact that you might have to replace some gas supply lines or switch your power supply to a higher voltage in case of an electric heater which might be beyond your technical ability. Be sure to consider all of these factors before you proceed.

However, if you have sufficient technical knowledge to carry on, here are some few guidelines for installation.

Step one: shut off the incoming water supply to your house.

Step 2: if there is an old water heater, disconnect it from the supply line. To avoid leaving a mess when you do this you should put a bucket beneath the hose to catch any water left in the line. You should also disconnect the old water heater from the power source.

If you are using a gas powered unit, start by shutting off the gas supply first by closing the valve. You can simply unplug an electric unit from the power outlet it was connected to. With these done you can remove the old water heater form its position.

Note: Be sure to dispose of your old water heater according to the regulations in your area.

Step 3: unbox your new tankless water heater and fit it with all the hardware according to the instruction manual. Determine the best location to place the new heater. Ensure that your new unit gets all the required space and clearance as specified in the local building code of your state.

Step 4: follow the manufacturer’s instruction for mounting the water heater on the wall. Ensure that it is well fitted and its weight is properly supported

Step 5: Hook up all necessary connections to the unit. For gas units, you will have to install ventilation ducts to the unit. Typically, you will need special stainless steel flue or a larger flue for a tankless water heater. Hook up the water supply line to your unit followed by the power source. This is simpler for an electric heater since you simply have to plug it into the wall. For a gas-powered unit, you will need to connect the gas supply line to the new heater.

Test your unit: check all your fittings and connections and be sure that everything is properly in place. Once you have made sure of these, power on your unit and test if everything is working perfectly.


As mentioned, it is important that you have some technical knowledge before taking up an installation project for a tankless water heater. Otherwise, it is best left in the hands of an expert. Also, since installation instruction might vary slightly for different manufacturers, you should consult your usual manual for assistance at all time.


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