Why Is There Water Underneath the Furnace?

If there is water pooling around the furnace, it could be a sign that something is wrong inside the furnace. The issue could be one of many problems, such as:

  1. Condensation

A condensation problem is the most common cause of water underneath and around the furnace. Both high-efficiency and standard-efficiency furnaces can experience condensation issues, but they stem from different causes. High-efficiency furnaces, also called condensing furnaces, produce condensation that is supposed to be channeled into a floor drain. If it is pooling instead, the tubing or drain could have become clogged. The tubing might also have a crack in it.

A standard-efficiency furnace is not supposed to produce any condensation. If it is producing condensation that means the flue pipe may not be properly sized and it should be corrected as soon as possible.

  1. Faulty Exchanger

Another possibility in a condensing furnace is that the secondary heat exchanger is faulty. This type of furnace usually has two or three heat exchangers instead of one like standard furnaces. If the secondary heat exchanger has a crack, water can drip out onto the floor. This problem could result in the need for a total furnace replacement.

  1. Humidifier

Some furnaces have a humidifier inside that adds moisture to the warm air blown throughout the house. This humidifier could be leaking, letting the water pool on the floor beneath it. This issue can usually be caught early on during furnace maintenance.

Don’t dismiss water pooling around the bottom of the furnace. No matter if the furnace is high efficiency or standard efficiency, it could mean there’s a serious problem that should be repaired right away. Make sure to schedule annual furnace maintenance with Diamond Heating and Cooling to catch these issues early or call us at 208-608-5050 if water is present.

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