Even before I got to pick up the bus I bid and got a Webasto DBW-2020 heating unit. This unit was designed to heat large Diesel engines in cold climates to keep from having cold starts. The marine industry used these same units for potable hot water via a water to water heat exchanger and zoned heat in large boats. It puts out 80,000 BTUs. In my thoughts "this is a big boat" so why not?. The unit uses a diesel fuel burner to heat a water jacket of antifreeze mixture and pump it out to the engine block. I have found 24V valves in both McMaster Carr and Granger that could open each heat loop circuit as needed on demand. This could be actuated by either a thermostat or a demand switch as for Hot Water at the galley sink for dishes or a shower. Each loop would be actuated by a 24V solenoid double pole double throw so as not to allow back flow of electrons to activate other systems that are not demanding heat. 
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