A block heater is an electrical heating element you plug in when needed. If it is below about 10, you leave it in all nite. If it is above, just plug it in about an hour or so before you need it.
It is attached to the engine by removing a frost plug and attaching it in the frost plug's position. The heat element is inside the engine and the the electical hook-up is outside. The heater assembly is held in place by an o ring.
It is the best type of heater I know of. See what others say about my details.- Scott
