Wabasto Furnace

[CC_Guy]

Webasto, except for select Marathons, uses engine coolant.

AquaHot does not use engine coolant for domestic hot water heating. It has a closed loop with a reservoir for it's own coolant. An AH may, almost always will, be equipped with a separate engine preheat loop that does use engine coolant. This loop will also heat the domestic hot water as well.

I've had both and prefer the separate Webasto and hot water heaters. It allows more implementation flexibility and potential for more hot water storage.