One of the challenges of showering in the camper is adjusting the water temperature for your shower. It seems that we always end up wasting a lot of water trying to set the temperature. At four (navy) showers per gray water tank, we can’t afford wasting water adjusting the temperature. There is an easy solution. And it works great for washing dishes. And it saves on propane. And it is easy – you can do it too.
Buy a meat thermometer. The kind with an alarm. With an extra long probe wire – ours is 6 foot. Then find your hot water heater. In our case it is located under the passenger side dinette, next to the furnace. It conveniently shares a door with the storage compartment next to it (easy access to the bypass valves for winterizing).
Insert the probe into the Styrofoam jacket of the water heater where the hot water pipe exits the tank. Then run the probe wire to a convenient location to mount the display. We mounted the display on the back of the clothes cabinet above the passenger side dinette. Buying a longer probe wire makes it easier to find a good spot
Now all we have to do is set the alarm for the temperature we desire and turn on the water heater. When the alarm goes off we turn off the water heater and take a shower (or do the dishes), turning on only the hot water. No need to waste water mixing to get the correct temperature. If we are both taking shower, we will check the water temperature between showers and turn the water heater back on to bring back up to temperature if needed. Somewhere around 108 to 112 degrees seems to work well for us.