Today I wired everything together and let the thermostat control the hydronic heating. So far, it is working great. It is quick to heat the coach and is fairly quiet. I checked the amp hours usage on our monitor and it was 1.9amp hrs with everything running- very pleased with that. Right now it is in the 50's and when the hydronic heat turns on, it heats up quickly and it takes some time for the thermostat to demand heat again. Might have something to do with the residual heat in the registers.
Right now I'm running on shore power with the water heater on 110v. I have it setup so that I can run off 110v, gas, and/or Espar. This weekend we are to have temps below freezing, so that will help out my testing. I'm anxious to try running it off the Espar alone.
Next I plan to add a small register in the outside water compartment. With the setup, the hot water circulates thru the cold water pipes keeping everything warm. I'm hoping this will also provide heat for the drains.