Most central furnaces don't use or produce water during normal operation, so it can be quite surprising to see water leaking around your furnace. There are a few uncommon problems that can cause liquid to pool on the floor around your furnace. Here are three possible causes for your furnace leaking water.
1. Flue Condensation
In a conventional furnace, condensation may collect in the furnace flue if exhaust gasses cool too quickly.
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