Hot water heater making noise

old guy wrote:
it's the check valve, it is partly plugged

I would bet this is it. Our 2007 Laredo 29RL did that and the check valve fixed it.

This is a bug with this type of water heater. I've had the water heater, mixing valve and check valve replaced, and it still makes the same humming sound when drawing hot water. Ours is in the back of our coach, so the only time we really hear it is when in the rear bath, I've just resolved to live with it and have read on forums others do the same.

outdoorsneed wrote:
May be the wire is heated and short circuited.

?????? explain

May be the wire is heated and short circuited.

it's the check valve, it is partly plugged

x2 for the check valve, probably piece of dirt caught in valve. Just put your finger on the valve to feel if there is any vibrations to go along with the humming.
If you suddenly don't have any hot water flow, then the valve has probably failed. A simple inexpensive repair replace.

Ken

Thanks Scott
It does sound like a buzz. I'll just keep an eye on it for now.

Is it kind of a soft buzz? My last one did that and it was the check valve on the output. I ignored it and eventually it went away.