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I'm looking at replacing my oil fired steam boiler -- a Burnham 7-series from the late 90's -- and since I have natural gas to my hot water heater, I'm inclined to go with a gas-fired boiler. Is that a good idea? I spoke to a salesman from an Oil company and (might want to sit down before you fall over from shock) he said that gas powered steam is less efficient because the most efficient gas boiler is about 80 or 802% efficient whereas the top of the line Burnham Oil powered boiler is 85 or 86% efficient.
It seems to me that gas is so much less expensive per BTU that the efficiency loss will be made up, but I have no way to even calculate that or make a reasonable guess. Am I off base here?
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