Why is My Furnace Leaking?

Is water gathering at the base of your furnace? Don’t panic — help is here. We’ll cover a few of the potential causes of a leak furnace, starting with the most likely.


Why Is My Furnace LeakingIn these cases, the most common culprit is a condensation leak. This type of furnace leak can occur as a result of the condensation you get from the cool exhaust on high-efficiency furnaces. If you’re not your unit is high-efficiency, there’s a quick way to tell: a white plastic vent pipe running into the furnace is a sure sign.

If you do have a high efficiency unit, you should also have a floor drain that helps remove condensation. Check to make sure that you do have a drain and that it isn’t clogged or covered. If it’s not that, you should check for a break in the condensation tubing line.

Other Possible Causes

If you have a metal exhaust pipe running into your furnace instead of a white plastic PVC pipe, you have a standard efficiency unit. These furnaces should not be producing condensation, so you can rule that out. An improperly sized flue pipe is one of the more common reasons for a standard efficiency water leak.

When it comes to high efficiency furnace leaks, condensation isn’t the only possibility. It could be that you have a faulty secondary heat exchanger. If this is the case, do it yourself options are probably out the window. That’s a serious issue that could likely require an overhaul or complete replacement of your Denver heating unit.

The furnace humidifier is another possible culprit. If a humidifier is leaking inside your furnace, it poses a real threat and needs to be dealt with quickly. Internal leaks can lead to expensive damage to your heating equipment.

Once you have ruled out simple issues like condensation drain clogs, your best bet is to call a Denver HVAC specialist for a service check. At Grand Home Services, we have plenty of experience fixing many different causes of water leaks around a furnace. Contact us at 720-365-1187 right away so we can help you get to the bottom of your heating issue.