and my furnace died.It's hot water base board. Well not the whole furnace, just the expansion tank. It has a pressurized bladder in it which also keeps water in the system (it's where the water line comes in). It'll run me about 100 for the part, but because the system was running without water in it, thus not generating heat and running (not burning oil thank god) continuously, I now have to replace a circulator at a cost of about 70. Thank god there are 5 fridays this month, and that I have a kerosene heater.