When a tankless water heater creates condensate, a dependable condensate pump is essential to prevent water damage and system shutdowns. This guide highlights five top options designed to handle residential condensate efficiently. They are best suited for homes with tight spaces, basements, or utility closets where a compact, automatic pump is preferred. Each pick is explained with who it’s best for, why it stands out, and a clear caution to consider.
| Product | Best For | Why It Stands Out | Limitations |
|---|---|---|---|
| Little Giant VCMA-15ULST | Small to mid-size installations | Compact footprint; strong motor for 65 GPH | No overflow switch on some variants |
| Little Giant VCMA-20ULS | Higher condensate volumes | 80 GPH capacity; robust 1/30 HP motor | 6-foot cord length may require an extension |
| Aquastrong 1/38 HP 85 GPH | Versatile multi-device setups | 85 GPH and 20 ft lift; compact with multiple inlets | Some models include safety switch as option |
| Asurity ULTRACP-22 | Basements or constrained spaces | 22 ft lift height; 120V automatic operation | Higher lift pump; may be overkill for tiny systems |
| Aquastrong Mini Split Condensate Pump | Mini-split and wall-closet installs | 9.6 GPH with 33 ft head; slim profile | Lower GPH than larger models |
Little Giant VCMA-15ULST 65 GPH Condensate Pump
Best for compact installations with limited space. The VCMA-15ULST uses a vertical switch to minimize footprint while automatically removing condensate from boilers, furnaces, air conditioners, and de-humidifiers. It is thermally protected with a 1/50 HP motor and can handle water up to 140°F (60°C).
- Best for: tight closets or utility spaces where a smaller pump is needed.
- Why chosen: reliable auto operation in a compact form factor.
- Caution: some setups may require an overflow switch accessory; verify fit before install.
Little Giant VCMA-20ULS 80 GPH Condensate Pump
This pump is better for higher condensate volumes without increasing the unit’s footprint. The VCMA-20ULS features a 1/30 HP motor and 80 GPH capacity, with a 6-foot cord for flexible placement. It’s well-suited for larger tankless setups or when multiple condensate lines converge.
- Best for: bigger condensate output or when more headroom is needed.
- Why chosen: solid balance of power and compact size.
- Caution: ensure cord availability reaches the outlet to avoid extension cords in wet areas.
Little Giant VCMA-15UL 65 GPH Pump (No Safety Switch)
This model mirrors the 15ULST design but omits the safety switch. It suits users who have integrated external safety alarms or where a separate overflow strategy is already in place. It uses a 1/50 HP, fan-cooled motor and an ABS tank with a stainless steel shaft.
- Best for: installations with external safety systems already in use.
- Why chosen: compact, predictable performance at a lower feature count.
- Caution: without a built-in safety switch, overflow management relies on the external system.
Aquastrong 9.6 GPH Mini Split Condensate Pump
Designed for mini-split installations and similar setups, this pump provides a quiet 9.6 GPH flow with a maximum head around 33 feet. It includes a safety switch option and a 3.3-foot power cord, offering flexible mounting for tight spaces like wall cassettes or over-ceilings.
- Best for: mini-splits, wall-mounted or tight-space installs.
- Why chosen: compact design with sufficient lift for limited-area systems.
- Caution: lower GPH means slower drainage; ensure it meets your system’s condensate rate.
Asurity by Diversitech ULTRACP-22 120V Condensate Pump
The ULTRACP-22 offers a higher lift height up to 22 feet and automatic operation. It’s suitable for basements or utility spaces where vertical discharge requires significant reach. It handles typical condensate from HVAC systems, including furnaces and dehumidifiers.
- Best for: installations needing substantial vertical discharge.
- Why chosen: strong lift with automatic operation for hands-off drainage.
- Caution: higher lift pumps may be larger than needed for very small setups; confirm space allowances.
Aquastrong 70 GPH 115V Condensate Pump
This pump balances performance and size with 70 GPH flow and up to 16 feet of vertical lift. It includes a safety switch option and a 3.3-foot power cord, making it adaptable for various HVAC configurations, including multiple condensate sources.
- Best for: mid-range condensate loads with flexible installation.
- Why chosen: strong flow for its compact footprint and an accessible safety option.
- Caution: ensure tubing and outlets are compatible with your existing setup to avoid leaks.
Buying Guide: Condensate Pumps For Tankless Water Heaters
- What flow rate do I need? Match GPH to your tankless heater’s condensate output. Bigger homes or higher output units may require 60–85 GPH or more.
- How high must the pump lift condensate? Consider vertical lift. If drainage line runs upward or to a distant location, choose a pump with higher head height (lift).
- Do I need a safety switch? An auto shut-off or external alarm helps prevent overflow. If not built in, plan for an external safety device.
- What power and cord length fit my space? Ensure the power supply matches the pump’s requirements and that the cord length reaches a protected outlet without cords in wet areas.
- Is space a major constraint? For tight closets or basements, select a compact, vertical pump with a small footprint.
- Material and durability considerations? Look for thermally protected motors, corrosion-resistant tanks, and stainless steel shafts for longevity.
- How easy is installation and maintenance? Pumps with removable reservoirs or accessible filter/maintenance points simplify upkeep and reduce downtime.
Frequently Asked Questions
- What is a condensate pump used for with a tankless water heater? It actively removes condensate produced during operation to prevent overflow and damage.
- Do condensate pumps come with safety switches? Some models include built-in safety switches; others require external alarms or switch implementations.
- Can I install any condensate pump for a tankless water heater? Yes, but verify GPH, lift height, and power requirements to match system needs.
- Is a taller lift height always better? Not necessarily; choose a lift height that suits your drainage route. Excessive height may add unnecessary complexity.
- How important is the GPH rating? It correlates with how quickly condensate is removed. If your system produces more condensate, choose a higher GPH pump.
- What maintenance does a condensate pump require? Regularly inspect the reservoir, float switch, and tubing; clean any buildup to maintain efficiency.