Hi,
I use the reiff 150 watt, with a timer. I did look at the ez heat but went with the reiff. I definitly wanted the oil to be warmed as well as heating the engine. For heating away from power I made a multifuel stove preheat setup similiar to the alaskan preheater , called the northern companion. Of course an insulated cowl cover and prop /spinner cover helps the preheating .