The short answer
A condensate pump collects water from a furnace, air handler or dehumidifier and pumps it up to a drain. Choose one whose maximum lift beats the height and run of your tubing, and wire its overflow safety switch to shut off the equipment if the pump fails.
Pumps we cover
- Little Giant VCMA-15ULS: 65 GPH at 1 ft, 15 ft shutoff, overflow switch.
- Little Giant VCMA-20ULS: 20 ft lift for attics and long runs.
- Diversitech ULTRACP-22: 22 ft lift, condensate to 160°F.
Upkeep
Algae and slime cause most failures. Clean the tank, float and check valve about every six months.
SafetyHigh-efficiency furnace condensate is acidic; use a pump rated for it, and have a technician wire the safety switch if you're unsure.
Products mentioned
Questions readers ask
What does the S in VCMA-15ULS mean?
It includes the overflow safety switch.
How often should I clean a condensate pump?
About every six months.