Proheat Supplied Marine Hot Water Tank

[Stormcloud]

I am in the process of installing the ProHeat for radiant heat in the bus, and have that system figured out.

I will use a another loop for hot water through a marine heat-exchanger type water heater. I have a second pump to flow heated antifreeze through to the heat exchanger of the water heater but the pump should shut off when the potable water reaches 140F.

What is the preferred method to control the pump? Thermostat on the waterheater tank?
What works for you?

Thanks for the advice.

Mark

[Zeroclearance]

Google >>  Honeywell  Aquastat.