Drain & Condensate Pumps

Drain and condensate pumps for air conditioners, high-efficiency furnaces, dehumidifiers and below-grade fixtures, with barb, FIP, rubber slip and garden hose connections.

A condensate pump moves water that has nowhere to fall. A high-efficiency furnace or an AC coil produces condensate continuously while running, and where there is no gravity drain within reach the pump lifts it to one.

Two ratings decide the model: lift height and gallons per hour. Lift is the vertical distance from the pump to the discharge point, and capacity falls as lift rises — a pump rated 20 feet delivers far less flow at 18 feet than at 3. Size from the actual rise, not the maximum on the box.

Furnace condensate is acidic, around pH 3, and will corrode a standard pump and eat cast iron drain line over time. High-efficiency installations need a pump rated for it and usually a neutralizer upstream.

The safety switch is the part that matters most: wired to the equipment, it shuts the appliance down if the reservoir overfills, which turns a pump failure into a no-heat call instead of a ceiling repair.

Brands include Liberty Pumps, Saniflo and Zoeller.