Water Heater, T&P Valve, Expansion Tank

Water Heater Maintenance Video

This video outlines a key component to water heater maintenance that is often overlooked, the expansion tank.

What does the expansion tank do?

The expansion tank will allow expanding water (water expands when it heats) a place to go.

Do you need one?

You need an expansion tank if you are on a water system with a back-flow preventer (a one way valve). If you are on city water and do not have a back-flow preventer you probably do not need an expansion tank. The city water system can absorb the expansion. Same with a well system.

Water Heater Maintenance on your expansion tank

Your expansion tank will have an outlet to connect up a pressure gauge. You can test the pressure at this port. It should match what your water pressure is set for. Watch the video for more details.

What problems you may have when your expansion tank fails?

If the expanding water has no place to go it could leak out of your system through the T&P valve.. If you expansion tank fails you can have leaks from the T&P relief valve, drippy faucets and faucet washers that wear out faster.

Water Heater Maintenance

7 thoughts on “Water Heater Maintenance Video

  1. This is a great tool. We are selling more and more properties that share common walls and everyone asks about these tanks. I’m going to post this on my own blog. Great info guys.

  2. I need some quick advice! I’m having a new water heater installed on Friday, 3/13/2020. I never had an expansion tank on the 21 year old heater and am about to be charged $333.82 to have one installed. Do I really need one if I never had one before? I don’t want to pay $333.82. The same a new Gas Stop Valve Replacement 1/2-IN (drip leg). Do I really need a new one if it “wasn’t broke” before? I’m about to be charged $349.10 for this and don’t want to if I don’t need to. Please advise! Please hurry! Thanks,
    Wade Classen

  3. I enjoyed and learned about importance of expansion tank for water heater.
    (Water Heater Maintenance Video)
    Thank you.
    Could you please provide step by step instructions on below.
    For boiler.
    Boiler expansion tank and pressure relief valve troubleshooting and replacement on oil boiler. How to determine which is bad if water dripping (very little bit) from boiler pressure relief valve. Is it tank or pressure relief valve?
    Pls include
    1. how to check water pressure for boiler (as it may be different than hot water heater tank) so I can adjust on 4.5 gallon expansion tank air.
    2. How to diagnosis if boiler relief valve is leaking whether its expansion tank or relief valve.

    For indirect hot water tank
    3. I have indirect hot water tank , do you need expansion tank if I have pressure relief valve installed on indirect hot water tank? If yes how to install.

  4. This video was very helpful! My expansion tank was leaking from the air pressure side and I had no clue as to why. I know now my tank has failed. I will try to replace this A.S.A.P. Or call my plumber. Either way I know more now than I did before. Thank you!

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