Why High-Efficiency Furnaces Leak Water (And How to Fix It)

High-efficiency furnaces (90%+ AFUE) produce condensation as a normal byproduct of operation. However, when the condensate drainage system fails, water leaks can occur.

How High-Efficiency Furnaces Produce Water

Unlike older furnaces, high-efficiency models extract so much heat from combustion gases that water vapor condenses inside the heat exchanger. This condensate must be properly drained away.

Common Causes of Condensate Leaks

1. Clogged Condensate Drain Line

The most common cause. Algae, mold, and debris can block the drain line, causing water to back up and overflow.

2. Frozen Condensate Line

In cold weather, condensate lines can freeze, especially if they run through unheated spaces.

3. Faulty Condensate Pump

If your furnace uses a condensate pump, pump failure will prevent proper drainage.

4. Cracked Condensate Trap

The condensate trap can crack over time, allowing water to leak before reaching the drain.

Professional Solutions

At FurnaceLeak.ca, we specialize in high-efficiency furnace condensate issues:

- Drain line cleaning and clearing

- Condensate pump replacement

- Trap repair or replacement

- Proper drain line insulation

- Preventive maintenance programs

Prevention Tips

- Schedule annual furnace maintenance

- Keep the area around your furnace clean

- Monitor for early warning signs

- Ensure proper drain line slope

Contact us at 604-704-0300 for expert high-efficiency furnace leak repair throughout Metro Vancouver.