Now is the time to clean out and rebuild your Monitor heaters. Don't wait until the middle of winter! Clean out your storage tank and inline filters. Siphon out any accumillated water in your tank. Don't forget the sump filter. Tanks rust out because of condensation in the bottom of tanks. When you refill use a water emulsifier. one quart of denatured alcohol will do the trick for 200 gal of kerosene.