The only less efficient and costly way to heat would be a fireplace. Before you can even think about getting heat, the boiler has to raise the water temperature to 212 degrees. 1000 gallons a year is what 38 hundred a year at current oil prices. It's insane to keep that old pig. Take out a loan and rip all of that crap out of your house and replace it with forced hot water. If you go with high efficiency stuff you can even get a tax credit