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Have a question on gas supply. Seems my small Utica cast iron boiler 50,000 btu input and my Bradford White tank water heater 40,000 BTU input will no longer run at the same time. Both are fed with 1/2 black pipe dropped from overhead 3/4 black pipe less than 15 feet or so from the outside meter.
Both units were installed at same time about 10 years ago and have been working fine all these years. This morning we turned on the dishwasher and as it uses up hot water the water heater fires normally (standing pilot). However when the boiler tries to fire (ignition system) it will start and run for a few seconds and stop, refire and stop, etc etc. Hearing this constant start/stop I went down to the boiler to see what was going on. Hot water heater was firing normally and boiler was doing the on/off thing fairly rapidly. Boiler seems to me to be starving for gas?
So I turned the hot water tank thermostat down to "Vacation" setting which killed the burner and the boiler started right up and ran fine. I let the boiler run for a few minutes and then tried turning up the temp on the hot water heater again and I get this scary "whummmppp" and little flash out of the bottom of the hot water heater as it lights off and again the boiler goes screwy.
As it is only 20 degrees out right now I shut the gas off to the hot water heater to let the boiler run.
One more note: A few weeks ago we moved the location of our gas stove so I shut the gas off at the exterior meter while the pipes were relocated. The stove is downstream from the boiler hot water heater drops. Both boiler and water heater have drip/sediment extensions near the gas valves. Could I have loosened some dirt in the line which is goofing up the gas valves somehow on the hot water heater/boiler. Any ideas on where to start? Who do I call to check/fix this? Boiler guy or plumber?