I have a Hydrotherm A-100 Pulse Boiler and the original gas valve is bad and I'm having a hard time finding a replacement gas valve. The problem is this boiler does not have a pilot, instead it works off of pressure and the gas valve thermocouple is actually a piece of small tubing from the pressure chamber of the boiler to the pressure sensing device on the valve. The original gas valve is a 120Vac Honeywell VR445M1009; we've checked several sites and found replacements for this valve but all are 24 Vac and use a standard thermocouple safety which I cannot use on this boiler since it doesn't have a pilot. The voltage of the valve is not a big problem. Can anyone help us find a valve that uses a pressure safety instead of a standard thermocouple?

I am new to the forum and relatively new to oil heat (coming from the midwest where nat. gas is more common). I currently have a 4 zone boiler with one zone controlling radiant heating for a bathroom over my garage. I have noticed that the floor has turned cold in sections of the bathroom. I suspected air in the tubing. Upon inspection of the rubber tubing in basement, emanating from the boiler, I noticed that 2 of the 6 tubes were cool while the other 4 were hot to touch. The 6 tubes are separated, 3 on each side, by what I think is a mixing valve. The 2 cool tubes are on the same side of the valve. I have tried to purge this zone and also added more water (pressure?) to my boiler. During the purge, there was relatively little to no air being pushed thru the discharge hose. Adding additional water to the boiler did seem to help as the two cool tubes turned relatively warm (slightly above room temp). The bathroom floor has in turn become warmer but far from the warmth my wife requires on a cold New England morning ;). The thermostat is constantly calling for more heat. Any suggestions?