$49 / month O.A.C Including Install
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Why Your Furnace Leaks

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Why Your Furnace Leaks

Posted On: November 24, 2024

Why Your Furnace Leaks

A leaking furnace can be a concerning issue, potentially leading to water damage and system inefficiency. Here's why your furnace might leak and what you can do about it:


1. Condensation Leak

  • Cause: High-efficiency furnaces (with AFUE ratings of 90% or higher) produce condensation during operation. This water typically drains through a condensate line. If the line is clogged, cracked, or improperly installed, water can leak.
  • Solution: Clear clogs in the condensate line, repair or replace damaged lines, and ensure proper installation by a professional.

2. Malfunctioning Condensate Pump

  • Cause: In systems requiring a condensate pump to move water to a drain, a malfunctioning or broken pump can result in leaks.
  • Solution: Test the pump for functionality and replace it if necessary.

3. Humidifier Issues

  • Cause: If your furnace has a built-in humidifier, leaks can occur from clogged lines, damaged seals, or excessive water pressure.
  • Solution: Inspect the humidifier for issues and repair or replace defective components.

4. Clogged Drain or Trap

  • Cause: Over time, debris and dirt can clog the furnace's drain or trap, causing water to back up and leak.
  • Solution: Clean the drain and trap to ensure proper flow.

5. Heat Exchanger Problems

  • Cause: Though rare, a cracked heat exchanger can sometimes lead to water leakage. It can also pose serious safety risks due to the potential release of carbon monoxide.
  • Solution: Contact a professional HVAC technician to inspect and replace the heat exchanger if necessary.

6. Incorrect Vent Pipe Installation

  • Cause: Condensation can form inside improperly installed vent pipes, dripping back into or around the furnace.
  • Solution: Have a professional inspect and correct the vent pipe installation.

7. Air Conditioning System Leaks

  • Cause: If your furnace and air conditioning system share the same housing, a leaking AC unit can appear as though the furnace is the problem.
  • Solution: Inspect the AC unit, including its condensate pan and lines, for leaks.

Preventative Measures:

  • Schedule annual maintenance for your HVAC system.
  • Regularly inspect and clean drain lines and traps.
  • Address any strange noises or performance issues promptly to avoid further complications.

If your furnace is leaking, it's essential to address the issue quickly to prevent water damage or operational inefficiencies. When in doubt, call an HVAC professional to diagnose and fix the problem.



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See What Our Customers Are Saying:

by John from Toronto on Twintech Heating and Cooling

Our furnace bit the dust, and Twintech came out to troubleshoot and diagnose the problem within a couple of hours. Mitch was super helpful, patient, and answered all of our questions. When we decided to get the furnace replaced, the crew was over first thing the next morning and did a fantastic job. Not only did they complete the job in a few hours, but they cleaned up and respected our house as they went, and answered all of our follow-up questions. I've used Twintech for our HVAC needs in the past and will continue to do so. I'd recommend them to anyone, and it feels good to support a local, family-owned business.

by Ryan k on Twintech Heating and Cooling

Dave and the Twintech team were fabulous from day 1 and helped us through the process to identifying a new furnace and AC unit. This was our first time through this process and Dave did a thorough job explaining all the components and was very patience answering all our questions. Dave provided great insights and fair pricing.

The Twintech team did an awesome installation. Very clean and efficient. I would highly recommended their service.

by Louise in Scarborough on Twintech Heating and Cooling

We had a new Amana furnace installed by Twintech and we were very pleased with the installation. It is nice to have a warm house again.

by Private User on Twintech Heating and Cooling

Excellent job. Excellent service. Competitive price. Its rare to find a company with the knowledge and professional results we have experienced with Twintech. The clean and neat installation with attention to detail and drop sheers to respect our property is a clear indication of Twintechs high level of integrity. The 1-1/2 gas line upgrade they did for our pool 3 years ago was awesome. Can't say enough. Thank-you Twintech.

by Private User on Twintech Heating and Cooling

Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.

by Private User on Twintech Heating and Cooling

This is a professional team that's easy to deal with. I would strongly recommend them

by hj.taggart in OSHAWA on Twintech Heating and Cooling

Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
Professional installation, on time and no mess.
Very pleased with their work and would highly recommend the company. Our house is three stories so they spent the time to do all the calculations to make sure we would have great performance on each floor.
Thank you again!

by susieschoeppler in Oshawa on Twintech Heating and Cooling

Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!

by Private User on Twintech Heating and Cooling

Great service and great people to deal with, from sales to installer. I highly recommend this company.

by GR from Oshawa on Twintech Heating and Cooling

Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

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