tm america
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i dont care for the tank type as they have a pump in them and it give one more thing to go bad .they just dont seem to hold up like the screw in type or freeze plug type does.i think thats why the manufactures run freeze plug or screw in type block heaters.screw in type is basically the same kind of heating element used in electric water heaters .allthey heat the whole tank not just whats near the element. all the coolant in the system is connected so any type of heater will heat all the coolant