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Furnace 101: Why is Mine Leaking Water?
Posted On: November 7, 2020
There could be several reasons your furnace is leaking water, but the most likely one is a condensation leak.
Usually, the condensation that comes from a high-efficiency gas furnace gets channeled to a floor drain. The leak could be caused by condensation tubing getting clogged or from breaks in the line. It may also be because the floor drain is clogged.
A standard-efficiency furnace with a metal exhaust pipe should not have any condensation. If it does, that could mean the flue pipe is not the right size. That could let the hot exhaust to cool down and condense inside the pipe, drain back to the furnace, and eventually leak.
Furnace Humidifier Issues
There may also be an issue with the humidifier which must be leaking inside the furnace. Of course, if your HVAC system receives annual checking and maintenance, this is a very unlikely scenario as your service technician would be able to detect this issue early.
If you have overlooked that tune-up, then you should make the call now because if it is, indeed, the problem, that leak could cause a lot of internal damage to your furnace.
Problematic Furnace Secondary Heat Exchanger
If the issue is not furnace condensation or problems with the humidifier, it’s possible that the source of water around your furnace is the secondary heat exchanger. You should really hope that it’s not, though, because if so, it’s going to be an expensive repair and might even require you to replace your furnace completely.
Clogged Internal Drain System
If your air conditioner is still running and it shares an internal drain with the furnace you’re using, then it’s possible that you have an internal drain system plug that is sending water to the furnace.
We cannot accurately diagnose your issue this way, but you should not let this go on for much longer. When your furnace is leaking, that is a clear indication that you have to call in professional help.
Leaks can result in much bigger issues that include damaging parts, not to mention ruining your flooring and walls. It may even lead to mold growth! A seasoned heating and cooling specialists like Twintech Heating and Cooling will be able to quickly find the source of the furnace leak for you and offer effective solutions to your furnace concerns. Do not hesitate to give us a call for any heating and cooling problems!
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See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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