Hot water heater making noise

Check valve inside nipple on HOT out....cheap plastic JUNK
As Doug pointed out....replace with BRASS

BUT ----I prefer shutoff valves vs any check valves.
One on each...cold/Bypass/Hot and NO check valves


IF noise is 'hissing' then scale/crud on electric heat element.
Vinegar or CLR soak and then really good flush/rinse
OR just replace element

If you figure out it is the check valve, replace with a BRASS check valve. They have larger orifices than the Plastic check valves and will allow more volume of water and minimize the water noises. The brass has the same size 1/2 inch threads. Doug

donn0128 wrote:
Noise? What sort of noise. Water hammer,hissing, what?

I agree. No description of what noise we're talking about makes an intelligent suggestion impossible.

Wild guesses, now, those are easy and a dime a dozen. So I'll hazard one. Note that this applies ONLY to the cases where the water heater is making a loud roaring noise which is often accompanied by excessive smoke. It is very common for spiders, stink bugs, mud daubers, and similar insects and bugs to get into and clog up the burner tube. When this happens, the solution is simple: clean out the burner tube.

Moved from Forum Technical Support

Noise? What sort of noise. Water hammer,hissing, what?