Expansion tank, suggestions to brand an size.

Discussion in 'Water Heater Forum, Tanks' started by JerryR, Jan 13, 2014.

  1. JerryR

    JerryR Member

    Joined:
    Jul 27, 2011
    Location:
    Florida
    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
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    New England
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  4. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    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.
     
  5. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Last edited: Jan 13, 2014
  6. JerryR

    JerryR Member

    Joined:
    Jul 27, 2011
    Location:
    Florida
    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: Jan 22, 2014
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