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Can smell gas when I run my new gas heater
I just converted my steam heating system from oil to gas. I had my old oil burner replaced with a new Carlin EZ-Gas Power Gas Burner, and I kept my old Pensotti R1-4S boiler. The newly installed burner passed inspection, and after fine-tuning, a test showed 88% efficiency. The burner is fed by a gas pipe that extends from a new external line installed by the utility company. The exhaust goes out through a new steel liner in the chimney.
The first time I turned on the heater, after 15-30 minutes I smelled methane at the top of the basement stairwell and in the basement next to the heater, so I turned it off. The heating guy came and did some additional sealing, and now the smell is less distinct (smells more like a mixture of methane and basement smell, instead of just methane like before), but the gas smell is still definitely there. There is no gas smell at all if I leave the heater off. The heating guy says he'll continue sealing it as needed, but I get the impression he's baffled. Any suggestions about where he could be missing the leak, which I could pass on to him? Could it be from the gas pipe that feeds the heater (though it only smells when the heater is running), or could it be due to an exhaust leak (though the methane should all have been burned by that point, right?).