Or you could install a recirculating pump.
danhMember since 04/16/03
Is it a popping sound when the burner is on? If so thats sedament build up in the tank. Is the heater old? Could be time to replace.
Plugged vents. Check the vent thru the roof for something plugging it. Codes are different in many parts of the country so I'm not sure exactly how...