Tankless water heaters can produce acidic condensate that needs to be moved reliably and safely. The right compact pump keeps the installation neat while protecting the system and surrounding area.
Below, we focus on small condensate pump options that fit tight spaces, offer dependable lift, and include the features most homeowners and installers actually need.
Best 10 Small Condensate Pump for Tankless Water Heater Picks for 2026
Best For Heavy-Duty Drainage
Superior Pump 97154 Condensate Pump
- 88 GPH capacity with 18 ft. max head
- 1/2-gallon tank plus 20 ft. tubing included
- Safety switch and built-in check valve
Best For: Buyers who need a compact automatic pump with strong lift for tankless water heater condensate.
Best for Compact Installations
Little Giant VCMA-15 Condensate Pump
- Compact footprint for tight utility spaces
- 1/2-gallon tank helps limit frequent cycling
- Stainless steel shaft and ABS housing for durability
Best For: Installations where a compact, reliable condensate pump is needed for a tankless water heater.
Best for Safety Shutoff
- Safety switch helps protect equipment during outages
- High-impact thermoplastic tank for condensate duty
- Works with tankless heaters and other HVAC gear
Best For: Homeowners needing a dependable condensate pump with automatic shutoff protection.
Best for Quiet Operation
Asurity Diversitech ULTRACP-22T Condensate Pump
- 22-foot max lift for flexible drainage routing
- Quiet-running design with vibration isolation
- Built-in overflow protection and indicator lights
Best For: Compact installs that need quiet, reliable condensate removal with easy monitoring.
Best for Overflow Protection
Little Giant VCMA-20ULS Condensate Pump
- Vertical switch saves space in tight mechanical rooms
- Overflow detection adds an extra layer of safety
- 80 GPH capacity with 20-foot shut-off for standard lifts
Best For: Installations that need a compact condensate pump with overflow protection for tankless water heaters and HVAC equipment.
Best for Everyday Use
FUJIWARA Condensate Pump (FUJ—40S)
- Under 18 dB operation for low-noise installs
- Compact mini design for tight spaces
- Probe sensing helps reduce float-related failures
Best For: Quiet condensate removal in compact HVAC-style installations where noise and space are key.
Best for Small Installations
Little Giant VCMA-15ULST Condensate Pump
- Compact vertical switch design for tight spaces
- Overflow detection adds helpful protection
- Includes 20 ft tubing for easier hookup
Best For: Compact condensate drainage setups for tankless water heaters and HVAC equipment.
Little Giant VCMA-15UL Condensate Pump
- Compact vertical switch design for tight spaces
- 65 GPH capacity with 15-foot shut-off
- Built-in check valve and multiple inlets for shared drains
Best For: Homeowners or installers who need a compact pump for a tankless water heater or other HVAC condensate sources.
Best for 230V Installations
Little Giant VCMA-20ULST 230V Condensate Pump
- Automatic switch saves space in tight mechanical rooms
- Includes overflow detection and 20' tubing
- Powerful 1/30 HP, 80 GPH performance
Best For: 230V condensate setups that need a compact, automatic pump with overflow protection.
Best Simple Pick
Little Giant VCMA-20ULST Condensate Pump
- Compact vertical switch saves space in tight installs
- Overflow detection switch adds shutdown/alarm protection
- Includes 20 ft. tubing for easier setup
Best For: Installers and homeowners who want a compact condensate pump with overflow protection for tankless water heater and HVAC condensate removal.
Best For Heavy-Duty Drainage – Superior Pump 97154 Condensate Pump
If you need a small condensate pump for tankless water heater drainage, the Superior Pump 97154 is a practical choice with enough lift to move water to a nearby drain line or utility sink. Its automatic operation, built-in safety switch, and included tubing make it easier to install in HVAC-style applications where dependable condensate removal matters.
Best For: Buyers who want a compact, automatic pump with solid head pressure and a safety shutoff for tankless water heater condensate or similar light-duty drainage.
Pros:
- Moves up to 88 GPH with a max head of 18 ft.
- Includes a 1/2-gallon tank and 20 ft. tubing for easier setup.
- Safety switch adds protection against overflow conditions.
- Built-in check valve helps prevent backflow.
Cons:
- Not the most compact option if you have very tight installation space.
- Primarily designed for HVAC condensate, so fitment may need checking for tankless installs.
For shoppers comparing a small condensate pump for tankless water heater use, this model stands out for its strong lift, automatic behavior, and included install extras. It’s a sensible pick when you want straightforward performance rather than a specialized ultra-mini pump.
Best for Compact Installations – Little Giant VCMA-15 Condensate Pump
Little Giant 554405 Vcma-15 Series Condensate Pump, 7" Height, 5" Width, 11" Length, 115V
Check Price On AmazonIf you need a small condensate pump for tankless water heater setups where space is tight, the Little Giant VCMA-15 is a straightforward pick. Its compact footprint, 1/2-gallon tank, and 115V operation make it a practical option for moving condensate away from the unit without adding bulk.
Best For: Homeowners and installers who want a compact, no-frills condensate pump for light to moderate tankless water heater condensate removal.
Pros:
- Compact size fits neatly in tight utility spaces
- 1/2-gallon tank helps reduce short cycling
- Snap-action switch supports reliable activation
- Stainless steel shaft and ABS components add durability
Cons:
- Not ideal for high-volume or heavy-duty drainage needs
- Basic feature set compared with newer premium pumps
- May require careful placement for noise-sensitive installs
Overall, this is a sensible small condensate pump for tankless water heater applications when you value simple installation and a compact profile over advanced extras. It covers the core job well for everyday residential use.
Best for Safety Shutoff – ECO-FLO CDSP Condensate Pump
If you need a small condensate pump for tankless water heater setups or other compact HVAC equipment, the ECO-FLO CDSP is a practical utility pump to consider. It’s built to move condensate away reliably and adds a safety switch that can shut equipment down if the pump loses power.
Best For: Homeowners or installers who want a straightforward condensate pump with built-in overflow protection for tankless heaters, furnaces, or dehumidifiers.
Pros:
- Safety switch can automatically shut down equipment during a power failure
- High-impact thermoplastic tank is made for everyday condensate handling
- Versatile enough for tankless water heaters, air conditioners, and dehumidifiers
Cons:
- Not a specialized tankless-only pump, so installation may take a bit of planning
- Manual should be reviewed carefully for setup and maintenance details
For buyers comparing a small condensate pump for tankless water heater installations, this ECO-FLO model stands out more for protection and practicality than for premium extras. It’s a sensible pick when safety shutoff and dependable condensate removal matter most.
Best for Quiet Operation – Asurity Diversitech ULTRACP-22T Condensate Pump
If you need a small condensate pump for tankless water heater installations or other compact HVAC setups, the Diversitech ULTRACP-22T is a practical fit. It offers a 22-foot max lift, included discharge tubing, and simple status indicators, making it easier to route condensate away from tight mechanical spaces.
Best For: Compact installs where low-noise operation, clear pump feedback, and dependable condensate removal matter.
Pros:
- 22-foot max lift gives flexibility for vertical drains
- Status lights and overflow switch help with monitoring and protection
- Rubber feet and vibration isolation support quieter operation
- Includes 20 feet of 3/8" discharge tubing
Cons:
- Designed for HVAC/R condensate, not a dedicated tankless-specific kit
- 120V power may not suit every installation layout
This is a solid choice if you want a small condensate pump for tankless water heater drainage without giving up lift capacity or service-friendly features. It’s especially appealing in tight utility areas where noise control and easy status checks are valuable.
Best for Overflow Protection – Little Giant VCMA-20ULS Condensate Pump
If you need a small condensate pump for tankless water heater condensate management, the Little Giant VCMA-20ULS is a practical, compact option built for automatic removal and overflow protection. Its vertical switch helps save space, while the included check valve, 6-foot cord, and 80 GPH pumping capacity make it a straightforward fit for tight mechanical areas.
Best For: Homeowners and installers who want a compact condensate pump with built-in overflow detection for tankless systems, boilers, or other HVAC equipment.
Pros:
- Compact vertical switch design helps reduce footprint in cramped installs
- Overflow detection switch can shut equipment down or trigger an alarm
- 80 GPH output and 20-foot shut-off suit typical condensate lifts
- Durable ABS housing, stainless steel shaft, and thermal protection
Cons:
- Wiring is required for the overflow switch function
- Not the quietest or most feature-rich option for premium installs
- Includes no alarm, so extra parts may be needed for full alerts
For buyers comparing a small condensate pump for tankless water heater setups, this model stands out for its space-saving layout and built-in safety controls rather than flashy extras. It’s a solid, dependable choice when you want simple automatic condensate removal with added overflow protection.
Best for Everyday Use – FUJIWARA Condensate Pump (FUJ—40S)
If you need a small condensate pump for tankless water heater setups or other tight-space installs, the FUJIWARA FUJ—40S is a compact option built around low noise, low power draw, and automatic drainage. Its probe-based sensing and 33-foot discharge head make it a practical fit where you want a discreet pump that can move condensate reliably without adding much sound to the room.
Best For: Quiet condensate removal in compact HVAC-style installations where space, noise, and easy hookup matter more than heavy-duty throughput.
Pros:
- Very quiet operation at under 18 dB with just 3W power use
- Compact, mini design that suits tight indoor installations
- Probe induction system helps avoid float-related drainage issues
- 33 ft discharge head gives it useful vertical pumping reach
Cons:
- Best suited to light-duty condensate removal, not high-volume pumping
- Wiring is straightforward, but still requires basic electrical setup
For buyers comparing a small condensate pump for tankless water heater applications, this model stands out most for quiet, space-saving operation rather than raw capacity. It makes sense when you need a discreet automatic pump for a nearby drain line and want to minimize noise and maintenance.
Best for Small Installations – Little Giant VCMA-15ULST Condensate Pump
If you need a small condensate pump for tankless water heater installs or other tight mechanical spaces, the Little Giant VCMA-15ULST is a practical pick. Its vertical switch design keeps the footprint compact, while the included overflow detection switch adds a useful layer of protection for boilers, furnaces, HVAC units, and dehumidifiers.
Best For: Homeowners and installers who want a compact condensate pump with overflow protection for tankless water heater or HVAC applications.
Pros:
- Compact vertical switch design saves space in cramped installs
- Overflow detection switch can shut down equipment or trigger an alarm
- 65 GPH capacity is a solid match for light-duty condensate removal
- Includes 20 feet of vinyl tubing for easier setup
Cons:
- Alarm is not included with the overflow switch
- Basic wiring knowledge is required for installation
- Not ideal for larger or higher-volume drainage setups
Overall, this is a straightforward, space-saving choice if you want a small condensate pump for tankless water heater condensate handling without a bulky footprint. It focuses on compact fit, dependable automatic operation, and basic safety features rather than extra advanced controls.
If you need a small condensate pump for tankless water heater drainage, the Little Giant VCMA-15UL is a practical, low-profile option that can also handle boilers, furnaces, air conditioners, and dehumidifiers. Its vertical float switch helps keep the footprint tight, while the 65 GPH rating and 15-foot shut-off make it a solid fit for light-duty condensate removal in tight mechanical spaces.
Best For: Homeowners or installers looking for a compact pump that can serve a tankless water heater or other HVAC condensate sources in one setup.
Pros:
- Compact vertical switch design saves space in crowded installs
- 65 GPH capacity with a 15-foot shut-off for common condensate runs
- Durable ABS housing and stainless steel shaft for long-term use
- Built-in check valve and multiple inlet openings support shared drain lines
Cons:
- No overflow safety switch included
- Not intended for high-volume pumping applications
- Best suited to standard condensate loads rather than heavy commercial use
For buyers comparing a small condensate pump for tankless water heater setups, this Little Giant model stands out for its compact size and flexible inlet design. It’s a dependable choice when you want simple condensate removal without giving up too much cabinet or floor space.
Best for 230V Installations – Little Giant VCMA-20ULST 230V Condensate Pump
If you need a small condensate pump for tankless water heater setups that use 230V power, the Little Giant VCMA-20ULST is a practical, compact option. It pairs an automatic switch with a high-capacity pump, making it a solid fit for removing condensate from HVAC, boiler, and high-efficiency equipment installations.
Best For: Homes or mechanical rooms that need a compact 230V condensate pump with overflow protection and included tubing.
Pros:
- Automatic vertical switch helps save space and manage condensate hands-free
- Includes overflow detection switch and 20 feet of vinyl tubing
- Strong 1/30 HP motor moves up to 80 GPH with thermal protection
- Built for 230V systems with CSA certification for U.S. and Canada
Cons:
- Requires 230V power and will not plug into standard 115V outlets
- Overflow switch wiring may be more involved for DIY users
- Overkill for very light-duty condensate applications
This is a good choice if your small condensate pump for tankless water heater needs come with a 230V electrical setup and you want overflow protection built in. It’s compact, capable, and better suited to higher-demand installs than basic mini pumps.
Best Simple Pick – Little Giant VCMA-20ULST Condensate Pump
If you need a small condensate pump for tankless water heater setups, the Little Giant VCMA-20ULST is a practical choice for moving condensate automatically and keeping the installation footprint compact. Its vertical float switch helps save space, while the included overflow detection switch adds an extra layer of protection for utility closets, mechanical rooms, and tight retrofit jobs.
Best For: Homeowners or installers who want a compact condensate pump with built-in overflow detection for boiler, furnace, HVAC, or tankless water heater condensate management.
Pros:
- Compact vertical switch design helps it fit in tight spaces
- Overflow detection switch can shut down equipment or trigger an alarm
- Includes 20 feet of vinyl tubing for easier installation
- Thermally protected 1/30 HP motor is built for continuous condensate removal
Cons:
- Alarm is not included with the overflow switch
- Basic wiring knowledge is required for setup
- Not ideal if you need a higher-capacity pump for long lift runs
Overall, this is a solid pick if your priority is dependable condensate removal in a compact package rather than maximum pumping power. For a small condensate pump for tankless water heater installations, the VCMA-20ULST stands out most for its overflow protection, included tubing, and space-saving design.
How We Picked the Best Small Condensate Pump for Tankless Water Heater
For a Small Condensate Pump for Tankless Water Heater use, the most important factors are dependable automatic operation, enough lift for the drain run, compact sizing, and a safety switch or overflow protection where possible. We also looked for pumps that are widely used in HVAC-style condensate applications, since tankless units create a similar low-volume drainage need.
We favored models with clear flow ratings, practical tubing support, and voltage options that match common residential setups. Quiet operation and simple maintenance also matter, especially when the pump will be installed near living spaces.
Quick Comparison
If you need the smallest footprint, look at compact units in the VCMA-15 class and similar mini pumps. If your drain line has more vertical rise, choose a higher-lift option such as an 80 GPH model. For added peace of mind, a built-in safety switch is usually worth prioritizing over a bare-bones design.
In general, lower-flow pumps are best for short runs and lighter condensate loads, while higher-flow pumps suit longer discharge paths or installations with more margin. Matching the pump to the actual drain route is more important than simply choosing the highest number on the box.
Key Buying Factors for a Small Condensate Pump for Tankless Water Heater
Lift Height
Check the maximum lift height first. If the pump cannot overcome the vertical distance to your drain, it will cycle too often or fail to clear water properly. Leave extra headroom beyond the measured rise.
Flow Rate
Most tankless water heater condensate loads are modest, so a compact pump does not need extreme output. A balanced flow rate is ideal: enough capacity to keep up during normal operation without being oversized for a tight install.
Safety Features
A safety switch can shut the system down or signal a problem before overflow occurs. That feature is especially valuable when the pump serves equipment in a finished basement, utility closet, or other sensitive area.
Noise, Size, and Power
Smaller housings are easier to place near the heater, and quieter pumps are better for indoor installs. Also confirm voltage compatibility; many residential models run on 115V, while some applications may call for 230V.
Who Should Buy Which Small Condensate Pump for Tankless Water Heater?
If you want the simplest choice for a straightforward setup, a compact 115V pump with a safety switch is the safest starting point. If your drain must travel farther or higher, choose a higher-lift model with a stronger flow rating. If space is extremely limited, prioritize the most compact footprint even if it means a slightly smaller reservoir.
For installers and homeowners alike, the best Small Condensate Pump for Tankless Water Heater use is the one that matches the drain height, fits the location cleanly, and includes the protection level you want for long-term reliability.
