block heater

noun
an electrically operated immersion heater fitted either to enter the water hose or the water jacket surrounding the cylinder block of a motor to warm the coolant in cold weather.
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The block heater shall be sized properly to carry the correct wattage and
  voltage for the engine chosen by the generator supplier.
Before energizing a block heater, run the engine until warm and refill the
  radiator to purge air from the system.
Replace any leaking coolant gaskets, check block heater and repair any leaks.
My customer wants me to install a receptacle in her free-stall barn for a
  tractor block heater.
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