S.B.
Our heating and water heater are on propane... i don't know if the costs are similar but here in Kansas we pay about 500 dollars to have the tank filled and have to fill it about 3 - 4 times/year depending on how good we are about conserving. The cost is cheaper in the summer, so we try to have it filled in August even if it isn't empty to get us through the first part of the winter.