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Question DetailsAsked on 1/31/2013

Our 50 gal. natural gas water heater, in attic, needs to be replaced. Does it need an expansion tank, as per new code?

House was built 1998. No expansion tank is on the water heater now.
One plumber says we need one, the other says we do not.
What are today's code requirements.

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3 Answers


"Today's code requirements" could differ dramatically, depending on where you live. If you want to be certain, call your local regulators. The company that sends you the gas bill should be able to either give you the correct answer or refer you to the regulating authority.

And do make sure you're using a licensed plumber. Check for someone in your area.

Answered 7 years ago by Oleron


thanks for the reply. We live in NC, Iredell county.
But as you said, I will call the gas company.

Answered 7 years ago by Muetti1911


Generally, if there is any sort of backflow preventer, poressure control valve, or such (basically anything more than an emergency shutoff gate or ball valve) in the water supply line between the street and the water heater, you have to have an expansion tank to absorb the expansion when the water in the heater expands during heating, to eliminate the possibility of a tank explosion or pipes bursting if the temperature/pressure relief valve on the heater fails to open under high pressure.

Answered 6 years ago by LCD

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