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Hi Ollie,
I want to do this with my Prius which has two coolant pumps. I have installed a 1500watt tank heater on the transaxle coolant lines and want to do it on the engine too. 1500 watts is too much. 750 would probably be about right.
I would like to heat up the heater core too so the inside is nice and toasty. That way I can justify the cost as part of my heating bill and the lady of the house is warm and happy too. I just have to hack the pump and install a manual switch.
To keep the heat in I have installed a thermal blanket over the engine and sealed off all gaps with foam tape. After an overnight soak at 5˚C the engine is still at about 12˚ This also helps keep the car warm when you stop to do an errand.
Those 400 watt block heaters were never meant for what we are doing.
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