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You do want 100% of your hot water to flow to the heater core within the car and then back to your fuel heater to be reheated - You don't need to be flowing any diesel heated water through the uninsulated electric heater under the car which would waste a good percentage of your heat. Part of the OEM heater's problem is that electric heater under the car radiates nearly as much heat to the outside air under the car as it does to the heater core - Very wastefulDon
You do want 100% of your hot water to flow to the heater core within the car and then back to your fuel heater to be reheated - You don't need to be flowing any diesel heated water through the uninsulated electric heater under the car which would waste a good percentage of your heat. Part of the OEM heater's problem is that electric heater under the car radiates nearly as much heat to the outside air under the car as it does to the heater core - Very wasteful
Don
