Is a furnace supposed to leak water? Things you might not know!

You simply found that there’s a puddle of water on the floor before your heater. For what reason does this happen? Is it a normal occurrence?

Is a furnace supposed to leak water? Well obviously no. Water leakage from your furnace calls for a fix! But still, it depends on the type of furnace you have.


There are various reasons why your heater could be spilling water. However, the most major reason is a leak from condensation. This is genuinely normal. However, before a causal assurance can be made, the administration expert has to recognize what sort of heater you have. Is it a highly-efficient furnace (condensing) or standard-efficiency furnace (traditional)?

You see that your heater is spilling water and you’re wondering what the issue is. Indeed, the appropriate response relies upon the sort of heater you have: a regular heater or a consolidating heater. In the event that you have a traditional heater, the two probably explanations behind leaking water include:

  • The measure of the pipe is inadequate
  • A defective humidifier
  • In the event that you have a condensing heater, it’s probable spilling because of any of the accompanying issues:
  • A blockage or problem in the condensate framework
  • There’s blockage with the condensate pump
  • A broken humidifier
  • An awful warmth exchanger

How to tell Condensing from Traditional Furnace?

On the off chance that you don’t know how to recognize, it’s anything but difficult to tell. You can decide the sort of heater you have by:

  • Checking what sort of material your fumes pipe is made of
  • Checking the heater’s AFUE rating


Investigate its vent or fumes pipe. On the off chance that the pipe is white plastic (PVC), your heater is a highly-efficient.  Your fumes pipe is the metal or PVC pipe that interfaces with your heater. And it passes through your home’s rooftop or side of the house. This pipe coordinates burnable gases from your home. Then again, a standard-efficiency furnace has metal fume pipes.


Another approach to telling if it’s high proficiency is by its AFUE (Annual Fuel Utilization Efficiency) rating. It measures how effective your heater is. On the off chance that it’s 90% or higher, having cool exhaust and generates condensation, it’s a highly- efficient. Then again, a standard-efficiency furnace does not generate condensation and rates less than 90% AFUE.

Ordinarily, heaters have their AFUE rating imprinted on a yellow energy guide sticker on the unit. But if your unit doesn’t have an AFUE rating on it, it certainly is a very old or conventional unit.

And now, since you comprehend what sort of heater you have, you can jump to the segment beneath that depicts the issues that may make your heater trickle water.

What causes water leak?

On the off chance that you notice water around the base of your heater, you should deal with it immediately. Water harm is not a joke and impacts different regions of your home. It includes the roof, dividers, and ground surface. Mold is an issue also. That is why we should know the common causes behind heater spills. Thus, you will know with such occurrences happen.


Once more, the major cause behind a leaking heater is a leak from condensation. Numerous heaters keep running at high efficiency, which means an AFUE rating of either 90 or above. This sort of heater contains two warmth exchangers that help it produce more warmth.

Moreover, highly efficient heaters concentrate heat from the combustion gases for a longer timeframe than a standard-efficient one. Then it makes the gases cool and condenses after that. The condensation is directed to a draining floor. On the off chance that the reason for the spilling water is condensation, there are some conceivable outcomes:

  • There might have a blockage on your tubing or drainage.
  • There might have a crack on the condensation line.
  • There might be something wrong with your condensate pump.

A standard-efficient heater removes some warmth from the combustion gases and rapidly vents them out the fumes or pipe. On the off chance that you have a condensation leakage this type of furnace, its pipes or vents are not fit. Thus, there is something wrong with the measurement. There ought to be no water cases with a standard-efficient heater.

Other Possibilities

You have to bring in an expert to evaluate what’s happening. On the off chance that the person discounts a condensation leak, there are different potential causes – all are requiring an expert.

There might be an issue with your entire house humidifier.

Another reason behind your heater spilling water is a break or blockage in the humidifier. These devices connect to your pipes framework so as to add dampness to the air. On the off chance that any sort of breakage happens, water will begin trickling around the heater. The same thing happens when they get any blockage.

Moreover, if there you connect your humidifier with your furnace, it could be leaking inside your heater. However, having yearly maintenance on your HVAC framework prevents this from occurring.

There is a blockage in your internal drain system.

If your air conditioner shares the same draining system with your furnace, there might be a problem. Your drain might have a blockage, and thus, it sends the water to the furnace.

Your furnace secondary heat exchanger is faulty.

An issue with the warmth exchanger in your heater could cause water leakage. And sadly, it is one of the most costly repairs. This is the most costly possibility since the only solution is to replace your furnace. Yet, this probability only happens with highly-efficient systems.

Maybe you should install another unit. A professional will most likely guide you on whether this needs to occur.

There might be a problem with the plumbing

Finding your heater spilling water may mean that there is an issue with the pipes and not simply the heater. There really may not be an issue with the parts of the heater, which is something to be thankful for. Be that as it may, the leakage is still an issue that you should be a concern of.

At the point when there’s a blockage on the pipes and it backs up in the drainage system, it is an issue. It appears just as the heater is spilling. And you need you to have someone fix the pipes or replace it.

There is a clog in the Filter

In the event that your heater’s pipe is dirty or has a blockage, it will limit the airflow going through the heater loop. Ordinarily, this makes the loops to solidify. Notwithstanding, at times, it makes water break and pool up around the heater.

Ensure you generally check the state of your heater’s air channel and replace it if it’s filthy.

Your Air Conditioner System is leaking

In mellow atmospheres like California, heaters and air conditioner systems operates during a similar season. At the point when this occurs and your forced air system is running, the condensation container fills. And then, the water trickles onto the heating system.

This causes it to appear as though you have a heater spilling water, yet it’s really the A/C system.

Why do standard-efficient (traditional) furnaces leak water?

For one thing, traditional heaters must not generate of any sort. So in the event that it has water leaking out from it, you ought to have an expert assess the unit right away.  There are two fundamental issues that can make your regular heater leak water:


The metal fumes pipe on your heater intends to gather and vent away from the gases coming from the combustion procedure.

Those gases should leave the fumes pipe and enter the environment before they cool off and turn into water. Thus, there is no room for condensation and water.

However, if the measurement of your pipes does not fit, the travel of the gases going outside becomes slow. That is why the gases cool off and condensate due to slow travel. And this causes leakage. On the off chance that this is your issue, you’ll need an expert to review your unit. Then, replace or update your fumes pipe.


Humidifiers are the devices that help add dampness to the warm air that is blown into your home. Be that as it may, there are possible issues with the humidifier. For example, if there is a blockage in your filter or drainage, it causes leakage to your unit. And instead of leaky humidifier case, homeowners often mistook it for a leaky furnace.

You’ll require an expert to examine the humidifier to perceive what is causing the leak and fix the issue.

Why do highly-efficient (condensing) furnaces leak water?

In contrast to traditional heaters, the condensation unit normally generates water. Unlike the conventional unit, condensation furnaces do not immediately vent combustion gases out of your home. Instead, it pulls much more warmth from those gases before enabling them to vent away into the air.

Furthermore, engrossing more warmth takes additional time. It needs enough time for those gases to chill off and condensate into the water before it leaves the heater. Regularly, highly-efficient heaters dispose of the condensate through its draining system. Thus, if that water winds up on your floor, it means that there might be an issue with your heater.

So what are the factors that can cause your condensation furnace to begin spilling water?


Your highly-efficient heater has a whole framework set up to drain the condensate it produces. Be that as it may, a possible issue can occur with your condensate line or drain.  If it has any blockage, water will start flooding and spilling from the heater and onto the floor.


Another highly-efficient heater requires a condensate pump to move the condensate towards its proper drainage.

A condensate pump is a little white box that connects to the PVC channel pipe. And it pumps water to the drainage.

If ever this condensate pump malfunctions, you’ll see water dribbling or flooding from it. Have an expert supplant this unit on the off chance that you see water spilling from the condensate pump.


This issue is a typical issue with both traditional and modern heaters. Humidifiers are the devices that help add dampness to the warm air that is blown into your home. Be that as it may, there are possible issues with the humidifier. For example, if there is a blockage in your filter or drainage, it causes leakage to your unit. And instead of leaky humidifier case, homeowners often mistook it for a leaky furnace.

You’ll require an expert to examine the humidifier to perceive what is causing the leak and fix the issue.


A condensation heater has 2 or even 3 heat exchangers instead of the single warmth exchanger in a traditional heater. This enables the heater to ingest significantly more warmth from the combustion gases before they leave the framework. Yet, it likewise implies that the warmth retention procedure is much slower.

What’s more, when those hot gases come to the second or third warmth exchanger, they had time to cool off. So the second/third warmth exchangers generate more condensate than the first heat exchanger.

In any case, if the path holding that warmth exchanger breaks, water will leak unto the floor. Tragically, a poor warmth exchanger leads to costly repairs. You ought to have an expert assess the warmth exchanger. That person will offer you proficient guidance on whether you ought to replace some parts of the whole heater.

Breaks are a genuinely regular issue for heaters. There are various reasons they occur- serious or minor. In the event that you return home with your heater spilling water, you’ll need an expert. Be that as it may, it never damages to remain aware and be guided on the various segments of your home.

Things to do when there is a Leak


When you notice water trickling from your heater or pooling up at the base, you have to act quick. Before an expert goes to your home to analyze the issue, it’s imperative to complete a couple of things.

  • In the first place shut the whole framework off. You should see a switch on or by the heater. In the event that you can’t discover this, turn the unit off at the breaker. You’ll have to tidy up all the water from the leak around the base. It’s critical to absorb all water completely, as water harm happens rapidly. On the off chance that you have a lot of water, you have to lease a wet-dry vacuum.
  • Next, check the air filter. In case that it is filthy and there are blockages, you’ll have to purchase another one. It is best if you can tell precisely where the leak is coming from. This will give you a decent sign of what the issue is. Be that as it may, you’re likely going to require proficient assistance.

Ask for a Professional Furnace Repair Services

As a rule, it is anything but a major fix, so there is no need to panic. It could be a couple of various things. In any case, you will require an expert technician to investigate it and resolve the issue for you. Try not to delay. Any issue involving water can rapidly get complicated. Not to mention that it can cause molds if you don’t deal with it immediately.

An expert on this field will most likely rapidly analyze why your heater is spilling water.  Then, the person will let you realize what to do and how to fix it. It’s significant that you contract a respectable organization in your general vicinity that has involvement with HVAC frameworks.

A few organizations lack expertise in AC units, so ensure the organization you contract additionally has experience working with heaters. You can also check surveys online to discover an organization that has a decent reputation of fulfilled clients. You would prefer not to enlist the principal organization you find and wind up spending a lot of poor workmanship.

That is why it is vital that you search for an organization with accreditation with the Better Business Bureau. And an organization that is associated with neighborhood contractors or developers affiliations. A solid nearby reputation is an indication of a great administration.

Final Thoughts

The most ideal approach to stay away from issues with your heater is to maintain it. Then, be watchful for any operational issues. It’s a smart thought to have experts check and maintain your heater every year. This expands the life span of the unit and helps monitor power bills.

In any case, issues are constantly conceivable. On the off chance that you see your heater spilling water, don’t delay to get in touch with an expert technician. Have someone that works with warming and cooling fix in your regions.




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