Quote:
Originally Posted by fanamingo
My frost plug style heater only pulls about 420 W, and that's plugged directly in the engine block.
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Don't think frost plug style heater can be directly compared to tank heater. Frost plug heater only heats the engine block. Depending on how it's installed, a tank heater can potentially heat the entire cooling system.
The previously cited
pdf published by the manufacturer includes a table of recommended system capacities for the various watt tank heaters. The system should hold at least 26 quarts for a 1500 watt tank heater. (see attached)
It's covered in the links I previously cited, but still possibly worth noting that flow from the tank heater should not be routed through the heater core if the car uses a vacuum operated heater control valve. When you shut the engine off the - vacuum operated heater control valves are normally closed.