As Pusher stated, I have to drive for about 100 miles for my hot water heater to be completely heated by the running of the engine. I don't know the full flow from the heater to the radiator and back but, I know that it takes a while for the water to get hot. I don't think that the running of the cab heater will have any effect on the hot water heater getting hot.
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Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny
'13 Ford Edge, InvisiBrake
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