wguss wrote:
We usually turn on the water heater when we're a few minutes from stopping for the night. It does have the feature of using the engine's hot water to also pre-heat the water in the water heater.
It could certainly be a bad pressure gauge but when I attach the hose for city water or turn on the pump it shows 45 pounds each time. I can turn a valve to add water to the tank and it snaps back to 45 pounds when static pressure returns. I often cycle the water from the pump through the tank to get all the air out of the lines and once again the pressure gauge always reads 45 pounds.
So it does this without hot water turned “on”??
I’d suggest you change your routine until you find out what thing it is that you’re doing that causes this.