Re: Hot water heater "knocks" with running water
Posted by not necessarily on June 20, 19100 at 15:00:26:
In response to Re: Hot water heater "knocks" with running water
Murphy you should be more careful in making those assumptions. It's not necesarily build up and it could be dangerous situation.

: : I just moved into a new home, and the hot water heater periodically "knocks" while the water is running. It is very loud and I can hear it in other rooms. This is an older gas heater from Sears (40 gal I think) and that's all I know. Is it about to die on me or is it something like air in the tank? Thanks!

: : Bryan

: your water heater has mineral build up in the bottom. It is not a dangerous condition. sometimes draining it can help but not very often. invest in a new water heater if it is that old, it may be worth the peace and quiet.

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