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Thread: 2 Gallon Expansion Tanks...Hot water VS Well expansion tank

  1. #1
    DIY Junior Member Its.me.again's Avatar
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    Default 2 Gallon Expansion Tanks...Hot water VS Well expansion tank

    Can anyone solve this mystery for me? When it comes to putting a 2 gallon thermal expansion tank on a hot water heater, can a person opt to use a 2 gallon well pressure expansion tank?

    What is the difference between these expansion tanks?

    I will use the following example that Lowes sells the 2 gallon hot water tank expansion tank for $40.00 and the 2 Gallon well pump expansion tank for $50.00. These are the "LPT2" series tanks.

    I wonder if most people complain that typical hot water expansion tanks experience bladder failure in 3 years? Do you think that the well style expansion tank has a stronger internal bladder and will last longer?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    They should be the same tank, because a 2 gallon "well pump expansion tank" would be absolutely useless for a pump system, (and well pumps do NOT have an expansion problem in the first place).
    Licensed residential and commercial plumber

  3. #3
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by hj View Post
    ...a 2 gallon "well pump expansion tank" would be absolutely useless for a pump system...
    A 2 gallon pressure tank on a well pump would be fine for a sprinkler system that is matched to the GPM of the pump so that it doesn't cycle. Also would work with a CSV.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    WH expansion tanks are designed to be installed on the cold water supply and won't work well on the hot side - the bladder dies earlier. Both a well tank and a WH would normally only have cold water feeding them, so, it's likely either should work. A well tank bladder would probably see MUCH more expansion/contraction of the volume of water, and to survive a decent service life, the bladder may be more robust to take the regular large excursions as the pump cycles. A WH, depending on its size, may only need to accommodate a cup or so from expansion, a well tank much more.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    In the Trades Gary Swart's Avatar
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    Interesting you found a thermal expansion tank at Lowe's. My Lowe's doesn't even know what they are. That aside, I have had my expansion tank in place for 5 years and it is still just fine.

  6. #6
    DIY Senior Member zl700's Avatar
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    Quote Originally Posted by hj View Post
    They should be the same tank, because a 2 gallon "well pump expansion tank" would be absolutely useless for a pump system, (and well pumps do NOT have an expansion problem in the first place).
    Unless its on a variable speed constant pressure well system or a jet pump booster system and then 2-gallon well tanks are the norm.
    If Payback is so important to you, why are you not driving a Toyota Corolla?

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