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hitachi369
Embrace Your Rights
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join:2001-10-03
Cincinnati, OH
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hitachi369 to Nightfall

Premium Member

to Nightfall

Re: Knocking hot water heater

How far is the room from the hot water heater? If it is far enough away the pipes could be cold. When the hot water turns on the pipes the pipes expand, and then cool back down. Causing a contraction in the pipes, causing it to knock, just like a hot car that cools down and pings.

Nightfall
My Goal Is To Deny Yours
MVM
join:2001-08-03
Grand Rapids, MI

Nightfall

MVM

said by hitachi369:

How far is the room from the hot water heater? If it is far enough away the pipes could be cold. When the hot water turns on the pipes the pipes expand, and then cool back down. Causing a contraction in the pipes, causing it to knock, just like a hot car that cools down and pings.
I doubt it could be the cold, never had this problem until about 8 years after we owned the house.