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Thanks for your testing.
To me, 750 watts sound too low even for a four cylinder in a cold climate.
Does your coolant heater also circulate the coolant?
If so you might want to consider how much heat you lose through the night from the radiator fins.
If you're going to be checking under the hood in the mornings anyway, then you might consider putting a couple of large ball-valves on your main radiator hoses . If your heater circuit dumps to the heater-core return line and goes directly back to the radiator ( like some cars do ), then of course you'd have to splice the heater-core return to another area on the engine-side of the ball valves, - not the radiator side.
I just thought I'd throw that idea out there, and I hope it was understandable.
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