Boilers are still used to heat many of the homes in the United States today. They're reliable and efficient, and because they use natural gas or propane, they're money savers in areas where the price of electricity is high. Boilers, like furnaces, have a tendency to smell bad when something goes wrong. While you shouldn't rely on your nose alone, the type of odor you detect from the boiler can give you a hint as to what the problem is.
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