We burn through about 900 gallons a year, 2100 sq ft house in Missouri, about $1800ish. We use it for heat and hot water. I'd verify that it was only $2200 through the propane company that services the tank, how many gallons was that? Propane prices fluctuate greatly, and sometimes it pays to prepay for all the propane you need for the winter in the summer. Prices tend to spike in the middle of winter because of demand.
Also you might have to pay rent on the tank, and then you also might have to contend with a leak someday as well. Just things to think about.