Heater

How effective is heater ? is that a standard ~1500w heater ?

Yes it is standard 1500 w heater. I have used it first time yesterday. It was 27F in the hangar. I turned it on and directed the warm air into one of the cowl flaps. I have checked the temp with the infrared touch less thermometer. The engine surfaces were 25F (through the oil check opening) . After approx. 1 hour and air temperature 75F from the heater ductwork outlet the engine surfaces (cylinders, engine block) went up to 45F. After another hour it was almost 60F but the outside temp went up to 37F as well. I don't know the internal temp of the engine but I think that after 3 hours is the oil warm enough to safely start the engine in this weather.