Water Not Hot Enough Winnebago Tour

[Tourinusa]

I have 2008 Winnebago Tour. New condition. Water from water heater is just warm in shower. Seems a little hotter in bathroom sink and kitchen sink. Water heater heats to 130 deg, have checked at heater with thermometer. I have checked and cleaned contacts on board in front of water heater. I understand some of these heater models (Atwood GHC 10A-4E) have a mixing valve. If mine does, I can't find it. I have looked on each side, top, and back of heater, and the plumbing diagram at Winnebago site shows none.

We are in Florida now and OK, but winter is coming. Mama is very concerned. Which means I am concerned also. Help....

[ClayL]

Winnebago uses a one valve winterizing set up. If the diverter valve leaks, cold water mixes with the hot and drops the temperature. That happened to me.

Another possibility is that the outside shower valves are on and the shower head valve is closed. That will allow a cold water cross feed. That also happened to me.

On some models Winnebago uses a mixing valve on the water heater to add some cold water to the hot water. If it is defective the output water temp can be low. I think when a mixing valve is used the water heater water temp is quite a bit higher than the 140 degree (plus or minus a few degrees) setting on the water heaters without one.

Below is a diagram I drew of the water heater and diverter valve on my coach. I do not have the diverter valve.

[Tourinusa]

Clay,

Thanks for the quick reply.

I had checked that the outside shower valves were both closed. Sounds like I need to find the two check valves, take out, check and clean if needed. Thinking now about the valves, I will turn on shower, then lightly tap the valves, just on possibility of breaking some trash loose. Then proceed to the disassembly procedure.

Thanks very much again. Glenn