Popping noise in pipe

Mallard1123

I just bought a new house and redid the bathroom. When I turn the hot water on there is a popping noise in the pipes for the first 20 seconds and then it stops. It does not do this at all with the cold water. what could be causing this? The noise sounds like an igniter trying to light something, but it is not an igniter in my heater.

joecaption

Where not there to hear it it, but when calcium builds up the the bottom of a water heater it pops loose when it gets heated. It will sond like a popcorn popper if it's really bad.
A water heater needs to have a hose connect to the bottom of it about every 6 months to drain off some of the solids that build up on the bottom.
I'd bet that 99 % of home owners have never drained off the soilds since they have owned the house.

Mallard1123

I just installed a brand new hot water heater two weeks ago. This only does it in my bathroom.

TheEplumber

Sounds like pipe expansion- especially on the hot water side or the drain expanding due to hw. The pipe is rubbing on wood as it expands- just a guess

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plumberinlaw

Yup, thermal expansion.

Mallard1123

Ok thanks