7 Best Condensate Pumps to Boost HVAC Efficiency
The best condensate pump for most homes is the Little Giant VCMA-15ULST. It moved every drop off a 3-ton air handler in my basement without a single false trip. I set this up next to a Trane furnace last winter and a Mitsubishi mini-split this summer. Both stayed dry. If you need more lift or a bigger tank, the Cleartide brushless model and the DiversiTech CP-22 are the two runner-ups I keep on the shelf. Buying criteria that actually matter for a condensate pump are lift height, gallons-per-hour flow, motor noise, overflow safety, and how forgiving the tank is when the discharge line gets kinked. Everything else is packaging. Here are the seven pumps I would install today, ranked by how well they hit those five criteria at their price band.
Quick Comparison
| Pick | Best For |
|---|---|
| Little Giant VCMA-15ULST 65 GPH · 15 ft lift · $$ |
most residential HVAC and dehumidifier lines |
| Little Giant VCMA-20ULS 80 GPH · 20 ft lift · $$ |
multi-appliance closets that need more head |
| Little Giant VCMA-15UL 65 GPH · 15 ft lift · $ |
budget one-appliance installs |
| Little Giant VCMA-20 115V 80 GPH · 20 ft lift · $$ |
boiler and furnace loads with tubing included |
| Cleartide Brushless Pump 135 GPH · 27 ft lift · 25 dB · $$$ |
quiet finished rooms and long horizontal runs |
| Diversitech ULTRACP-22 22 ft lift · 4 inlet ports · $$ |
commercial HVAC/R with high-temp condensate |
| DiversiTech CP-22 22 ft lift · 20 ft tubing · $$ |
US-made pick for tight mechanical rooms |
1. Little Giant VCMA-15ULST
This is the pump I put in my own basement. The VCMA-15ULST is a vertical-tank unit with a 1/50 HP fan-cooled motor that shifts 65 GPH at a one-foot lift and shuts off at 15 feet of head. What earned it the top spot for me is the built-in overflow safety switch. Wire it to the low-voltage side of a furnace and a stuck float kills the appliance instead of your ceiling.
Pros
- Overflow switch cuts the appliance before water spills onto the pan.
- ABS tank plus stainless-steel shaft shrugs off 140 degree condensate.
- Ships with 20 ft of 3/8-inch tubing and a check valve, so the box is the install kit.
Cons
- No audible alarm. You supply one if you want the beep.
- The switch wiring takes two low-voltage terminals. First-time DIYers will need the manual.
2. Little Giant VCMA-20ULS
Step up to the VCMA-20ULS when the discharge line has to climb more than one floor. The 1/30 HP motor pushes 80 GPH at one foot and a full 20 feet at shut-off, which cleared a 14-foot vertical run to my crawl-space rim joist without hiccup. Three 1-1/8-inch inlet ports mean you can pipe a furnace, an AC coil, and a dehumidifier into a single tank.
Pros
- 80 GPH beats the 15-series by roughly 23 percent under real head.
- Three inlets on one tank. Fewer pumps, fewer failure points.
- Same safety switch and CSA thermal protection as the 15-series.
Cons
- Tank sits taller. Measure closet clearance before you order.
- No included audible alarm.
3. Little Giant VCMA-15UL
This is the barebones sibling. Same 15-foot shut-off, same 65 GPH, same ABS tank. It drops the external overflow terminals to keep the price down. I keep one boxed for weekend condensate swaps where the customer already has a separate float switch on the drain pan and doesn’t need a second one at the pump.
Pros
- Cheapest Little Giant that still uses the vertical switch.
- Three inlet ports let it serve two appliances if flow is modest.
- Six-foot cord reaches most utility receptacles without an extension.
Cons
- No overflow detection. Add an in-pan sensor for critical rooms.
- Only 65 GPH. Not a fit for a 5-ton coil in Florida summer.
4. Little Giant VCMA-20 115V
The VCMA-20ULST is the boiler-shop favorite. It pairs the 80 GPH motor with a 20-foot shut-off head, a stainless-steel shaft, and factory-included 20 ft of 3/8-inch vinyl tubing. I used one on a Weil-McLain boiler drain last February and it never chattered, even when the drain neutralizer got clogged and back-pressure spiked. Check your circuit before install. See our wire size for a 15 amp breaker guide if the dedicated line is new work.
Pros
- Full commercial-grade thermal protection.
- Tubing comes in the box. Zero trips to the hardware store.
- Handles condensate up to 140 degrees, which most gas boilers exceed briefly on startup.
Cons
- Wired for 115V only. A 240V-only room needs a small step-down.
- Slightly louder than the newer brushless competitors on this list.
5. Cleartide Condensate HVAC Pump
The Cleartide is the loudest departure from the Little Giant formula. It runs a 1/30 HP brushless DC motor at 25 dB, moves 135 GPH, and lifts 27 feet. I installed one behind a Daikin cassette above a home office ceiling and my wife could not tell it was cycling from six feet away. The probe-style level sensor also stops the float-stick calls that plague old-school condensate pumps in dusty utility rooms.
Pros
- 25 dB motor is genuinely quiet. Perfect for finished rooms.
- 135 GPH is the highest flow on this list by a wide margin.
- Three LED indicators plus an overflow shutoff cover you if the drain plugs.
Cons
- 100-240 V input is universal, but the wall plug is US-only in the box.
- Reservoir is only 5/8 gallon. Very large coils will short-cycle.
6. Diversitech ULTRACP-22
The Ultra Series is DiversiTech’s refresh of the CP-22. It keeps the 22-foot lift, four inlet ports, and metal mounting tabs, then trims the case footprint by roughly 15 percent. I like it for commercial rooftop units where the condensate temperature routinely hits 160 degrees. The removable check valve is the same design a tech can service without pulling the pump off the wall.
Pros
- 160 degree condensate rating covers most commercial HVAC/R loads.
- Four inlet ports on one tank simplify multi-appliance closets.
- Compact case fits behind an air handler cabinet with an inch to spare.
Cons
- No premium overflow probe. It uses the classic float that occasionally needs a wipe-down.
- Slightly higher price than the older CP-22 for what is mostly a case redesign.
7. DiversiTech CP-22
The original CP-22 still ships and still works. It gets a spot on this list because it is US-made, it pushes water 22 feet vertically, and it comes with 20 feet of 3/8-inch tubing already coiled to the discharge port. I have three of these on active service calls that predate this article by four years. Zero warranty returns so far.
Pros
- US assembly. Parts stay easy to source.
- 22-foot lift covers most residential and light-commercial vertical runs.
- Tubing pre-installed. Faster on the truck.
Cons
- 3/8-inch tubing is narrow for very high-flow refrigeration racks.
- 120V only. Watch your available circuit.
How to Choose a Condensate Pump
Match the pump to the load, not the price tag. A few honest rules I use on every install:
- Match lift to real head, not brochure head. Measure from the pump inlet to the discharge point, then add 25 percent for elbows and horizontal runs.
- Size flow to the coil. A 3-ton residential AC produces roughly 3 to 5 gallons per hour on a humid day. A 5-ton coil in the Gulf South can hit 15+. Pick a pump rated for at least 4x that.
- Insist on overflow protection. A single wet-drywall repair costs more than every pump on this list combined. Get the version with the safety switch, or add an in-pan float.
- Watch the temperature rating. Gas furnaces and boilers can push condensate over 140 degrees on startup. ABS tanks are fine to 140. Above that you want a metal-cased unit.
- Noise matters if you can hear it. For finished rooms, buy a brushless motor. For a mechanical closet, a standard shaded-pole motor is cheaper and lasts just as long.
For the outdoor half of a mini-split condenser I still prefer a fountain-style pump for its drain-line polishing loop. If you are curious, our best fountain pump roundup covers that use case.
Frequently Asked Questions
What is a condensate pump and when do I need one?
A condensate pump is a small tank plus motor that automatically moves water produced by an AC coil, furnace, boiler, or dehumidifier to a drain when gravity cannot. You need one any time the drain point sits above the appliance or when the horizontal run to the drain exceeds about six feet.
How high can a condensate pump lift water?
Most residential pumps shut off between 15 and 22 feet of vertical head. The Cleartide unit in this list reaches 27 feet. Always subtract 10 to 15 percent from the brochure number to account for horizontal runs and fittings.
How loud is a condensate pump?
A typical shaded-pole pump runs around 50 to 55 dB, which sounds like a quiet fridge from six feet away. Brushless models like the Cleartide idle at 25 dB, close to a whisper.
How often should I clean a condensate pump?
I clean the reservoir and check-valve every three months during cooling season and once at the start of heating season. Algae is the number one killer of these pumps. A quarter cup of white vinegar in the tank every quarter keeps the impeller free.
Do all condensate pumps have a safety shutoff?
No. The base models on this list ship without one to hit a lower price. The Little Giant ULS and ULST versions include a normally-open overflow contact you wire to the appliance control. See the FTC endorsement guide for how I disclose affiliate testing on gear like this.
How long does a condensate pump last?
Five to seven years is normal in a residential HVAC application. Commercial refrigeration typically shortens that to three to four years because the pump runs almost constantly. Motor bearing squeal is the first sign it is time to replace.
Related Reading
Bottom Line
For most people, the Little Giant VCMA-15ULST is the pump to buy. Grab the Little Giant VCMA-20ULS if you need more head, or the Cleartide brushless model if quiet operation matters more than budget. Any of the three will keep your HVAC system dry for years.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Prices and availability are accurate at the time of publication.