Larry, in reference to your diagram in Post #9. Is this the way Kitfox recommends you plumb the coolant lines? (i.e. in parallel to the main coolant radiator).
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Michael
The Rotax diagram that I modified (in post #9) reflects the way my build manual instruction say to plumb the cabin heater. I've never seen a diagram published by Kitfox that shows the cabin heat exchanger included.
Larry Olson Kitfox Series 6 - 1st Flight Oct 2021
Tri-gear, smooth cowl
912 ULS