image of an hvac technician repairing a furnace that is leaking

We purchase home appliances thinking they won’t break. However, this isn’t how it is, and problems can happen at any time. They might even arise when you least expect them. For instance, you might find that your furnace is leaking water when you come home one day. The bad news is that this scenario has a high chance of happening. There are several causes to a furnace leaking water, with some major reasons and some minor. Whatever it is, you need to resolve it right away.

Why Is My Furnace Leaking on the Floor?

There are several reasons that cause a leaking furnace. The kind of furnace you have is a huge factor in this, especially if you have a high-efficiency system instead of a conventional one. Read on to learn about the usual culprits behind furnace leaks.

Condensation Or Clog In The Furnace

A highly-efficient furnace has a cool exhaust that may generate condensation. It is a natural byproduct of fuel combustion. It is drained via a PVC pipe that empties into the furnace room’s floor drain.

However, it can frequently get clogged. This results in the water backing up and leaking out of the furnace, which can be a major issue.

Conventional furnaces shouldn’t naturally leak water. If you have a furnace that’s over 15 years old, the leak might be because of an incorrectly-sized pipe that’s causing the water to back up the furnace.

Whatever the case is, the problem needs to be repaired right away. It is highly recommended that you contact a qualified HVAC repair team because it is a complex issue.

Broken Furnace Condensation Line or Condensate Pump

As previously mentioned, condensation is a natural byproduct of high-efficiency furnaces. The moisture is typically drained via the condensate line. However, if it gets damaged or broken, a leak could happen.

Furnaces nowadays are equipped with condensation pumps. It works exactly as it’s called, pumping out the moisture from the furnace. This way, your furnace remains dry. If it develops a problem, leaks and other issues might occur.

Problems with the Humidifier of the Furnace

The furnace’s humidifier is the issue in many cases. Homeowners add this component to help make their homes more comfortable during the cold season when the air is very dry.
It needs water to work. However, the humidifier might develop issues as time passes, causing it to leak water. For instance, the device might develop cracks. Often, the water leaks back into the furnace and creates an even more complicated situation.

You might think you can handle this problem with a DIY repair. However, humidifiers are sensitive equipment that needs a skilled and qualified professional who can conduct thorough inspection and repairs when needed. Although it is typically checked as part of your system’s yearly maintenance, ask your technician to inspect this component first when making a problem diagnosis.

The Air Conditioner Might Be the Culprit

You might not suspect it, but the problem could be caused by the air conditioner. If the climate in your area makes you use the furnace and the air conditioner over the same period, it could be the AC that’s causing the leak.

Air conditioners absorb the water in the air and condense it. The water is drained outside through a pan. However, a leak or a clog can make it seem as if the furnace is causing the issue when it is, in fact, the air conditioner.

Again, it is a good idea to ask your HVAC technician to inspect both your furnace and air conditioner to find the cause of the leak. Your equipment will have a longer lifespan when you let a professional repair it. It will also free you from any stress.

Should I Replace My Furnace Filter?

image of a furnace filter replacement

Yes, you should replace your furnace filter. It is recommended that you check your furnace filter once a month and replace it as needed. However, this won’t fix the leak as it isn’t the root of the problem. Change the filters once repairs are done and before turning your furnace back on. This will ensure that your furnace has a smooth operation for a longer time.

What Do I Do When I Notice a Furnace Leak?

image of a furnace repair

Call your local, trusted HVAC professional to fix the leak as soon as possible. Leaks can create massive problems, such as damaging furnace components and your home’s floors and walls. It can also cause mold to grow, which is a problem you wouldn’t want in your home.

However, there are several preparations you need to do before a professional HVAC technician visits your home.

First, switch off the entire system by using the switch next to the furnace. You can use the breaker to disconnect the furnace if there isn’t a switch. Mop up the water that might have pooled around the base of the furnace. Check if you have a clogged or dirty air filter as well. Replace it when necessary. Finally, wait for the professional HVAC tech to arrive!


A furnace leak isn’t the end of the world. The first step towards a stress-free solution is to hire a professional HVAC tech to inspect the issue. Look for a company specializing in HVAC systems with a good reputation in your area. This way, you can be sure that the problem will be repaired in no time.

Call Tower Energy For All Of Your HVAC Requirements

Tower Energy LogoFor all your heating and cooling service needs in Hartford County, Connecticut, call Tower Energy. Our company has professionally certified technicians who can do high-quality furnace maintenance, boiler repairs, AC installations, and more! All our friendly techs are equipped with extensive knowledge and years of experience to conduct correct HVAC services at all times.

Rest assured, we have one of the most affordable HVAC service rates in the area. Our tune-ups can increase your energy efficiency, comfort, and indoor air quality while lowering your heating and cooling bills. We can also recommend the best HVAC repair and replacement solutions within your needs and budget. All our work is backed by a guarantee because your satisfaction is our priority. Give Tower Energy a call today to schedule a service appointment. We offer free, in-home estimates.

Contact us now or call us at (860) 677-7347 to find out more.