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Thread: Expansion tank, suggestions to brand an size.

  1. #1
    DIY Senior Member JerryR's Avatar
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    Default Expansion tank, suggestions to brand an size.

    I will be replacing my 17 year old AO Smith, 50 gallon electric water heater. The current installation does not have an expansion tank but current code requires one.

    This is a closed system w/backflow.

    Static water pressure is 70 PSI
    I plan on installing a 6 year, GE 50 gallon medium height electric WH from Home Depot
    Typical cold water temp is 65dF winter and 80 dF summer
    I plan on setting water heater temp to 140dF and using a mixing valve set to 120dF

    What tank to use. Amtrol 2 gallon, Amtrol 4.4 gallon or Watts DET-5, 2.1 gallon?

    JR
    JR

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    Retired Defense Industry Engineer jadnashua's Avatar
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    http://www.watts.com/pages/support/sizing_DET.asp is a good expansion tank sizer. As to which brand is best, I'll leave that to the pros.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    In the Trades Gary Swart's Avatar
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    I would also suggest a pressure regulator valve. 70 psi is a bit too much pressure, especially if there are higher spikes. As far a expansion tank brands, I suppose there are differences in opinions on this, but I have a Watts that has been working just fine for several years. As I recall, HD carried 2 sizes, and there was a chart on the boxes to guide the buyer on sizing. I don't think the size is overly critical. Just balance at air pressure with the water pressure. Another reason to lower the water pressure.

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    Forum Admin, Expert Plumber Terry's Avatar
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    I think 70 PSI is fine. The smaller tank, around 2.2 gallons.
    We've been pulling out GE tanks that haven't lasted very long. I'm used to the Rheem and Bradford White which seem to last a lot longer. I don't think I would want one in my home.

    http://www.terrylove.com/forums/show...ave-failed-Why
    Last edited by Terry; 01-13-2014 at 10:34 PM.

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    DIY Senior Member JerryR's Avatar
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    Quote Originally Posted by JerryR View Post
    I will be replacing my 17 year old AO Smith, 50 gallon electric water heater. The current installation does not have an expansion tank but current code requires one.

    This is a closed system w/backflow.

    Static water pressure is 70 PSI
    I plan on installing a 6 year, GE 50 gallon medium height electric WH from Home Depot
    Typical cold water temp is 65dF winter and 80 dF summer
    I plan on setting water heater temp to 140dF and using a mixing valve set to 120dF

    What tank to use. Amtrol 2 gallon, Amtrol 4.4 gallon or Watts DET-5, 2.1 gallon?

    JR
    UPDATE:

    I went with a 6 year GE 50 gallon electric WH from HD and a Watts DET5 2 gallon expansion tank. I used the Honeywell AM1 mixing valve from my old home.

    I've had good luck with the 6Yr 50 gallon GE electric heaters from HD. Reading reviews, the gas versions seem to be more problem prone. Time will tell.

    It took longer to drain the old heater than install the new one.

    JR
    Last edited by JerryR; 01-22-2014 at 08:08 AM.
    JR

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