2,3 or 5 gallon expansion tank?

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Nate848

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I have a heat pump electric water heater with 65psi and 50 gallon water heater. What size do I need as several people all told me difference sizes?

Thanks
 

breplum

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As I like to say: LMGTFY heard of a search engine?

Techincally, you only need an expansion tank if you have a closed system. In other words, if you have a city water pressure supply, with even a pressure reducing valve (as long as that PRV has built in bypass) then no expansion tank is required.
 

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