How To Install A Water Heater Expansion Tank

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If you have a tank-type water heater, there is a chance you need to have a water heater expansion tank. When a normal tank-type heater is used, the thermal expansion of the water can stress the plumbing system. An expansion tank can take up the excess water caused by the expansion, reducing the pressure within the plumbing. This goes a long way in protecting the plumbing system from damage.

In many cases, you'll find that the water heater doesn't come with an expansion tank. Therefore, you'll have to figure out how to install one on your own.

Pre-Installation Checks

Before the actual installation starts, there are several things you should first check. These are:

  1. Ensure there's enough space on top of the water heater to install the expansion tank

  2. Ensure the expansion tank has the right capacity to take up the excess pressure in the system

  3. Turn off the water and power supply. For gas heated systems, ensure the gas is turned off too

Turning off the water is necessary since you'll need to disconnect the water inlet. Turning off the power and gas is necessary for you to work safely.

Locate the Cold Water Line

The cold water line is the one that brings water into the heater. It will normally be horizontal to the water heater. It's this pipe that the expansion tank will be connected to.

Position and Fix the Expansion Tank

Place the expansion tank above the water supply. The tank should be placed in a location that will allow the water heater to reach it as well. Mark the locations where the mounting brackets will go and drill the required holes. Finally, using the brackets, secure the expansion tank to the wall.

Connect the Tee

Take a tee fitting and connect it to the supply pipe. Position the fitting in a way that will allow it to be connected to the expansion tank.

Connect the Expansion Tank

Take the expansion tank's connector and join it to the tee fitting. Ensure that you use Teflon tape to make the joint water-tight. Use a wrench to tighten the joint, but don't overdo it or you risk breaking the joint.

Test the System

Turn on the water, power, and gas and see if there are any leaks in the system. Turn on the heater and see if hot water is available. You may need a water heater repair expert to assist if the installation doesn't go as planned. He or she will be able to help you with your water heater installation needs. 


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