Leaking Furnace: What You Need To Know

Water damage is one of the most common household disasters, and a leaking furnace can quickly turn into a major headache for homeowners. A leak can cause structural damage to your home and lead to mold and mildew growth that poses serious health risks. 

If you notice water leaking from your furnace, it’s crucial to address it promptly to avoid costly repairs and potential health hazards.

In this blog, we’ll explore the common causes of water leaking from furnaces and provide practical tips on how to fix and prevent leaks. 

How Does My Gas Furnace Work?

Before diving into why your furnace might be leaking, first let’s understand how it works. When the indoor temperature drops below the thermostat’s set point, the thermostat signals the furnace to start the heating cycle. This process involves turning the ignition switch on, opening the gas valve, and creating combustion in the draft fan. 

The combustion warms the heat exchanger, and flue gases are released outside through the exhaust pipe. A blower fan then pushes cool air from inside your home past the heat exchanger, warming the air before it’s distributed through your home’s ventilation system.

Why Is My High-Efficiency Furnace Leaking Water?

The gas furnace does not actually produce water. However, a high-efficiency furnace (90% efficiency or higher) includes a secondary heat exchanger where the exhaust gases condense into water vapor. This condensation needs to be adequately drained. Otherwise, you might find water leaking from your furnace.

Several components in a high-efficiency furnace can cause water leaks if they malfunction:

• Condensate Drain Hose: This hose can become clogged with debris, leading to a backup and water leakage.
• Inducer Assembly: Cracks in the inducer assembly can cause water to leak out of the furnace.
• Condensate Drain Line: Loose connections or clogs in this line can prevent proper drainage, causing leaks.
• Condensate Trap: Not all furnaces have this, but a clogged condensate trap can cause overflow and leaks.
• Condensate Pump: Water can back up and leak if this pump fails. Most pumps last 3-5 years before needing replacement.

Why Is My Standard-Efficiency Furnace Leaking Water?

Unlike a high-efficiency furnace, standard efficiency furnaces (80% efficiency) do not have secondary heat exchangers. Thus, if you have a standard-efficiency furnace and notice water leaking, the source is likely another appliance. 

Some of the most common culprits include:

• Air Conditioner: AC units generate water and can leak due to a damaged drain pan, frozen evaporator coil, or clogged drain line.
• Water Heater: Leaks can occur from a cracked tank, loose drain valve, or faulty T&P valve.
• Humidifier: Built-in humidifiers can leak if the water lines crack or clog.

Is a Furnace Leaking Water Dangerous?

While a leaking furnace might not pose an immediate danger, it can lead to serious problems if left unresolved. Water can cause rust and damage the furnace’s components, reducing efficiency and leading to breakdowns. 

Rust on the heat exchanger is particularly dangerous, as it can lead to carbon monoxide leaks. Water can also damage electrical components, potentially causing the furnace to stop working.

What Should I Do If I Have a Leaking Furnace?

If you discover water leaking from your furnace, follow these steps:

• Turn Off the Furnace: To prevent further water leakage, turn off the furnace at the thermostat or use the furnace switch.
• Clean Up the Water: Use towels or a wet vac to remove standing water.
• Inspect the Furnace: If you’re comfortable, unscrew the front panel and clean up any water inside.
• Call a Professional: Contact an HVAC technician to diagnose and fix the issue. Delaying repairs can lead to more severe problems.

How Can I Prevent My Furnace from Leaking Water in the Future?

Preventing leaks involves regular maintenance and proactive steps:

• Schedule Routine Maintenance: Have an HVAC professional inspect and tune up your furnace annually. They can identify and address potential issues before they become major problems.
• Keep Drain Lines Clear: Regularly check and clean the condensate drain lines to prevent clogs.
• Inspect Components: Periodically inspect the condensate pump, drain hose, and other components for signs of wear or damage.

How Restoration 1 Can Help

When facing a furnace leak, professional assistance can make a significant difference. Restoration 1 specializes in water damage restoration and cleanup, ensuring your home is protected from further damage. 

Our certified experts are trained to handle all types of water damage, from minor leaks to major flooding, through the following services:

• Water Damage Restoration: Immediate response to mitigate and repair water damage.
• Water Extraction and Drying: Efficient removal of water and thorough drying to prevent mold growth.
• Sewage Cleanup: Safe and effective cleanup of contaminated water.
• Storm Recovery: Comprehensive restoration services following severe weather events.

Water damage from furnace leaks can escalate quickly, leading to significant property damage and health risks. By acting promptly and seeking professional help, you can protect your home and ensure a swift recovery. 

Restoration 1 of Cary offers expert water damage restoration services, helping you address furnace leaks and prevent future issues. Don’t wait until a small leak turns into a major problem. 

Contact us today to schedule a free consultation.