06ViewH,
Thanks. You said that you were able to raise the temperature of the water. What temperature do you think most RV hot water heaters are pre-set to? I assume you keep you system running all the time, but if you were to turn it on in a cold coach, how long till you start getting some serious heat out? Sorry for all the questions, but I am looking to build something similar to heat my bathroom that doesn't have heat....but is right next to the hot water heater. I have a new residential hydronic heater core (just a length of copper tubing with aluminum fins on the outside) that I was thinking of using for this application.
Steve