No, furnaces should not leak—but they do. Water and forced-air furnaces just don’t mix. Furnaces in cold climates often have water flowing through humidifiers in the plenum. These humidifiers can leak. A modern high-efficiency furnace (over 90%) works by condensing steam from the products of combustion; this produces water that must be drained from the furnace. So, again: A furnace can leak and this leads to anything from a routine maintenance chore to a major defect. During a typical home inspection, you use normal controls to operate the furnace. You also open the cabinet ...
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