Why is My Furnace Leaking Water?

Is your furnace leaking water?

There are a couple of things that can cause a furnace to leak water.

If you have a high-efficiency furnace, the #1 cause of furnace water leaks are condensation leaks. You might be asking, “what causes a condensation leak?”.

Most likely your condensation leak is caused by:

  • Clogged condensation drain
  • Clogged condensation tubing
  • Condensation line break
  • Condensation pump issue (if you have one)

You’ll need an HVAC contractor to diagnose the actual issue.

Why Does My High-Efficiency Furnace Create Condensation

High-efficiency furnaces have 2 heat exchangers, which allow the furnace to extract heat from gasses for longer periods of time. As gases cool, they release a tremendous amount of heat as they change their state from gas to liquid (creating condensation). One of the main products of combustion of natural gas is water. That condensation then travels out of your home through a condensation drain.

How do to tell if your furnace is a high-efficiency furnace?

  • The yellow energy tag on the front of your furnace lists the furnace as 90% of higher AFUE.
  • If the yellow energy tag is missing, you will need your furnace model &/or serial # to search on the manufacturer’s website & obtain the efficiency ratings.
  • The flue pipe is white PVC instead of metal.

What if my furnace isn’t a high-efficiency furnace?

Most likely the cause is an incorrect flue pipe size, but you will need to contact a technician to diagnose your problem.

Do you need a professional HVAC contractor in the Loveland/Fort Collins area? Contact Epic Heating and Air Conditioning for all your furnace and AC needs.


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