Designing a satisfying boiler system requires a lot of thought and doodling on note paper.A handful of creative thoughts:How to avoid temperature overshoot inside?How to defend against short cycling the burner.Control the interior air temperature?Control the coolant temperature?Domestic hot water loop?Engine pre-heat loop? And the reverse? Using 2000 lbs of hot engine as a source of heat after a drive?Generator contribute anything to the system?Where and how to fill the system, catch the noisy air bubbles, room for expansion? Defence against self destruction when it springs a leak?Battery voltage or household voltage?How long can it boondock before charging/plugging in?A great exercise in creative engineering!Happy coaching!Buswarrior
my 12 volt pumps are $400 each and I have 4 of them but I used them from the aqua hot system I replaced .https://www.youtube.com/watch?v=Y-8EWK1Moh0&t=74sthere is a lot involved to do this dave
By all means put in valves to isolate the coach and engine. A hot water loop isn't a bad idea either and rather easily done especially if you can use convection to move water in the hot water heater tank. (May be difficult) Don't go too small on the lines but big solenoid valves ain't cheap.Jim
You've got it.Hotwater heater makes a fine reservoir.Use the power pole or generator to help make heat or redundancy for boiler failure.Good for the solar power dump too.Coolant boilers will only make 160 degrees. The engine will go to 195.Running the domestic hot water supply up to a high temperature and using a tempering/anti-scald device gives you "more" hot water than tempering down the whole supply.Beware of introducing feedback loops to the engine that will overheat it, if all the parts have reached full temperature, and aren't shedding heat from the coolant heading back to the engine... it's all lovely until everything is hot...Study the stock HVAC control strategy, valve in the return...I'd be inclined to have a NC valve, only needs power to facilitate block heating when shut down, and power is available to open when engine running and heating is desired.Also fails safe to protect engine if something goes wrong with it all...And if you are really slick... control all of this from INSIDE the coach. So many busnuts have to go outside and open many bay doors to change their configurations... In the rain, in the cold, on the side of the road, etc etc...Quarter turn valves can have extensions put to their shafts and brought up through the floor into the bottoms of cabinets, under seating, etc...Why does a busnut want to go out there?Happy coaching!Buswarrior
LOL Aqua Hots are great they never need servicing or give problems .I never had a Aqua Hot worked on for less than $700 bucks x's that by 100 he makes some serious bucks