If you have the Aqua Hot turned on there should be not be a problem. The Aqua Hot will maintain the liquid in the boiler at a much higher temperature than what the what the wall thermostats in the coach are set for. I forget what Roger said but it's well over 100*F. That happens whether there is domestic water present or not.
My only concern in that situation would be that if the Aqua Hot were set to operate on electric, that there was some way of knowing if the electrical supply failed. Otherwise, I think I would set it to Diesel. A few nights of running the Aqua Hot would be very cheap insurance whether on electric or Diesel.
Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, Sold - Retired From RV'ing, Linux Mint