I have a Bradfod-white old gas water heater that doesnt seem to keep the water hot enough. The pilot is lit, but it doesnt go into a big flame except when I turn it down, then when it cools off, I can turn the thermostat back to HOT all the way and a big flame comes out to heat the tank.Could this be the thermocoupler ?? I bought a new line (thermocoupler) but not sure how to disconnect the pilot part of the line.Greg Borden Philadelphia PA 8/18/97