How to Install a Natural Gas Tankless Water Heater

What You'll Need
Plumbers' wrench
Shut off valve key
Container for water
Tankless hot water heater
Gas supply line
Stainless steel flue

A natural gas tankless water heater saves energy compared to a regular hot water heater since water is not being held and in the tank and energy used to keep it hot. A tankless water heater supplies hot water on demand. They are more expensive initially but with the energy and therefore monetary savings it can be a good option.

Step 1 – Prepare the Supply Lines

You will need a licensed professional to install a larger gas line if your home doesn’t already have one. You also need a licensed electrician to up the voltage supply if needed. Check the exhaust system you are required to have as well. Finally be sure that you are adhering to any building codes that apply before you begin the installation.

Step 2 – Turn off the Water Supply

Turn off the main water line to the house. The main shutoff valve is usually outside the home.

Step 3 – Remove the Existing Hot Water Heater

Remove the water supply line from the heater and drain the water into a container. Unplug an electric heater. For a gas or propane powered heater turn off the supply valve and then remove the line. Remove any mounting bolts. Remove the hot water heater and dispose of it properly.

Step 4 – Decide on the Location of the Tankless Heater

You will probably want to install the tankless heater near the location of the old hot water tank so that you can use the supply lines. If you are having new supply lines run by a professional then you may want to mount it on an exterior wall. Be sure you have clearance around the heater as required by building codes in your area.

Step 5 – Install the Tankless Heater

Remove the heater from the packaging and read the instructions carefully for your particular model. Mount it to the wall with the proper wall mounts.

Step 6 – Install the Flue

Install the right size ventilation and flue for the heater. You may need to install a flue made of stainless steel depending on the heater you purchased.

Step 7 – Connect the Lines

Connect the water supply lines to the tankless water heater. Then connect the gas line and open the valve on the gas line.

Step 8 – Turn on the Water

Now go back to the main water supply valve for the house and turn it back on.

Step 9 – Test the Heater

Light the pilot light, if it is a gas heater. Then turn on hot water in the house and see that you get the temperature of water you expected and within a reasonable time.

Step 10 – Make Adjustments

Using the manual that came with the tankless heater, make any adjustment necessary to the heater to have it function as expected.

When doing any project that includes gas lines or electricity, exercise extreme caution. Don’t hesitate to hire professionals to ensure the safety and functionality of your new tankless hot water heater.