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Question DetailsAsked on 9/8/2017

my daughter just paid $800. for expansion tank, regulator , & cutoff valve. Sounds like too much

this was on a gas water heater that was making a siren noise

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1 Answer


You did not say if the tank pressure was checked at the end of a firing cycle - could have just been a slightly leaking pressure relief valve, which is undoubtedly (unless the tank was split and leaking a touch) what was making the sound. If that was the case of course the expansion tank might not have solved the situation. They commonly last as long as a heater, but I have seen them go out in 5 years or so too - typically about $100-150 replacement cost.

That certainly, unless in very high cost area like NYC, Boston, SF, CT areas, sounds like it is high by close to 50% - here are links to a number of previous similar questions with some cost ballparks. I would have expected more like $400-500 range - UNLESS she lives in one of the areas where they require a two-stage pressure regulator or integral pressure regulator/backflow preventer which can cost $250-400 just for that item - looks more like a two-hump camel with two stems or domes rather than jut having one dome and adjustment stem.

Answered 3 years ago by LCD

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