I'm wondering way no one has just used a magnetic oil pre-heater on there oil tank, like is available for a truck or car? Or how 'bout this; a finned cooler of any type. Any piece of junk from anything that doesn't leak. (A refrigerator, old power steering pump, old car heater, ect). Place in a metal tank. Fill tank with some anti-freeze solution. Connect your oil line to the cooler. Heat the tank of liquid with a magnetic heater. The heat will transfer to the oil running thru your "cooler". Wala heated oil to your burner.

your welcome