wailing water!

well the technician replaced the valve and it still made a noise. so he took out the middle and it still made a noise so then he took out the middle part of the lower valve and so far... we will see if it lasts.
when we go north we will have to have the valves replaced so it can be winterized.
everyone told us it would be the top valve!

Thanks
Looks like a technician job
Esp as the space is very tight behind the water heater

They are inside the nipple that screws into water heater tank.
You disconnect water line at fitting then remove the nipple/check valve assembly.
Replace with new nipple/check valve assembly
OR
Remove the internals getting rid of check valve and install a shut-off valve on line instead

Thanks. How do I know what they look like and where they are?
2006 itasca 29r?
Thanks all

Winnebago uses two check valves - one on the inlet and one on the outlet. One of mine started making noise last winter but the valves are such a bear to get to that I just let it go. Then after about a month it stopped making noise.

Check valve in HOT outlet nipple on water heater tank is cause of noise.

It is a cheapo plastic plunger/spring/o-ring assembly. Mineral build up, weakened spring, o-ring out of position can cause squealing, chattering noises as water flows thru it.

The check valve is used as a cost saving measure (cheaper part/easier to install) vs a shut-off valve in hot outlet line for isolating the water heater. It is there to prevent backflow into water heater when bypassed.

They usually end up clogging up or failing which then ends up restricting/stopping hot water flow out of water heater.

I'm glad my water heater uses 3 shut-off valves....no cheap check valve

We had the same issue with the back flow valve. It was emitting a high shrieking noise when the hot water tap(s)were opened. We replaced it and the problem was solved.

Is it louder at the back of the water heater?
Often times the back flow preventer is noisy. It won't hurt anything - I never did anything about ours and I think it finally got more quiet or I just learned to ignore it!