Our boat uses a Webasto hydronic heater when we're not underway, or during the first 20-30 minutes after startup. Once we get up to operating temp, I throw a switch that changes from "system heat" to "engine heat". The engine coolant circulates through the same radiators as the diesel fired heat, so there aren't any "extra" outlets to work around and the amount of heat from each register is (somewhat) regulated by switching the fan to either low, high, or off.
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