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Question DetailsAsked on 9/2/2013

Does Fairfax County VA government require installations of hot water heaters with expansion tanks

I need to replace a hot water tank for a rental house. Is the expansion tank a requirement in Fairfax, VA?

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1 Answer


They appear to follow the general plumbing code - here is their page on the matter -

Basically, if you have any type of pump or valve in the water supply line between the street and your hot water heater, to include pressure pumps, backflow preventers, flow regulators which can totally shut off flow, pressure regulators, etc - then you have to have a pressure expansion tank. Basically, almost anything in-line between your house and the street other than a meter without backflow preventer or an manually operated emergency shutoff valve like a ball or gate valve is likely to invoke this requirement.

This is standard plumbing practice, and protects you from broken pipes or unnecessary temperature/pressure relief valve opening and dumping water on your floor because the expansion from the heating water had no place to go, so it bursts pipes or makes valves leak or explodes water heater or potentially furnace, so for your protection.

Answered 7 years ago by LCD

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