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Why is Your Furnace Leaking Water?

Alarmed to have found a puddle of water at the base of your furnace? You are not the only one. This is a common problem that many homeowners have faced before. There are multiple causes for furnace leaks. In this article, we will discuss the most common reasons that a furnace may be leaking water.

Reasons for a Leaking Furnace

There are many reasons why your furnace may be leaking. The most common problem is condensation. The puddle at the base of your furnace may simply be a build-up of condensation that has dripped down to create a pool at the bottom. A highly efficient furnace system has more of a chance of creating condensation as it contains two heat exchangers instead of one.

Though this produces more heat, it also gives the gases a chance to cool down and condense. If you have an older, less efficient system, it should not produce condensation, so if this is an issue with your furnace it could be a sign that it contains a flue pipe of the wrong size. You can usually tell if you have this type of system by the material of the piping. If it is metal, it is a less efficient system. If it is plastic, you are likely to have a high efficiency furnace. If you have a condensation pump, something may also have gone wrong with this.

Another reason for water in your furnace could be leaky or clogged pipes. If pipes have been fitted incorrectly and are pushing against one another this may cause pressure and tension at the joins that can lead to cracks and leaks.

If you have a humidifier or an air conditioner, problems with these could be the source of the leak. A problem with the humidifier such as a crack or blockage, or a clogged drain inside an air conditioner can cause such appliances to redirect water to the furnace. This will give the impression that the problem is with the furnace, but it may not be. It is helpful to establish where the problem might be, but if you cannot work it out, a general HVAC company should be able to help you.

Finally, the secondary heat exchanger can also cause problems with leaks. This is an expensive part to replace or repair, so if this turns out to be the problem you might be best to look for an entire new system rather than paying to have this one repaired. But it doesn’t hurt to get a quote for the repair from your local heating company before making that decision.

What to do if Your Furnace is Leaking

If your furnace is leaking, it is important to call a professional in as soon as possible to find out what the problem is and fix it for you. Do not delay or ignore the problem, as an ongoing leak will eventually damage other elements of your furnace system which will lead to more difficult repairs. It can also lead to more extensive damage, spreading to your floors or walls for example. Calling someone in on a scheduled appointment is likely to cost less than an emergency call out later on.

A heating company will be able to provide the help you need. It can be tempting to attempt to fix the problem yourself, but if you lack the expertise you could end up causing more problems that will lead to greater expense further down the line. Put your mind at ease and call someone in to stop the leak and fix any other problems.

Tonna Mechanical is a top HVAC company in Rochester, MN. We are here to ensure that the temperature in every space in your home or office feels just right. If you have having issues with your furnace due to leaking or other heating and cooling issues, please don’t hesitate to call us at 507-216-4610.

  • December 12, 2015
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  • By Patrick Murphy