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Question DetailsAsked on 11/30/2014

can one expansion tank serve two hot water heaters

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I am sure there is some jurisdiction that has banned that, but in general yes - it is commonly done (using one large metal tank located right downstream of the incoming water shutoff valve, pressure regulator, and backflow preventer) in condos and apartment buildings even though each unit may have its own water heater. In areas where each living unit has to have a separated system with backflow preventer between each unit, i don't see how you could get away with that - though not a consideration in a single-family residence with two water heaters, if that is your case.

You have to be sure the tank is adequately sized for the combined expansion volume from all the connected appliances so using the existing one whenn adding a second heaters is not likely to work unless it was oversized in the first place, and you need to be sure that there is no flow-regulating or restricting device between the appliances and the tank.

Answered 5 years ago by LCD

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