It sounds like the water control valve is stuck, or not working. I think that model is vacuum controlled. Find the valve, ( follow the heater hoses) and check for vac. At the hose on the valve. Either vac. Closes the valve, or no vac.. But you should be able to see the valve move. If all else fails, disconnect the heater lines, and hook them together.
Sunday, January 17th, 2010 AT 8:10 PM