Looking Beyond the GRAT 75,000 BTU Inverter Pool? 6 Alternatives Worth a Look

How these alternatives compare

Vidapool 75,000 BTU Inverter Pool Heat Pump

The Vidapool 75,000 BTU Inverter Pool Heat Pump matches the GRAT unit’s heating capacity but adds cooling functionality. Both units serve pools up to 21,000 gallons and feature inverter technology for efficient operation. The Vidapool model is notably more compact, measuring 9 by 14 inches with a height of 18 inches, compared to the GRAT’s larger footprint. It also uses a metal black finish rather than gray. You get smart control and quiet operation in both, but the Vidapool offers dual heating and cooling modes. This makes it a practical choice if you need temperature regulation in both directions without sacrificing BTU output.

WARMBLU 21,000 Gallon Inverter Pool Heat Pump

The WARMBLU 21,000 Gallon Inverter Pool Heat Pump targets large inground pools with a focus on quiet, efficient heating. It shares the 21,000-gallon capacity of the GRAT unit but differs in physical dimensions. The WARMBLU is taller, reaching 36.2 inches in height, while being wider and deeper. It operates on 220V power and features a white finish. Both units use inverter compressors for stable temperatures. The WARMBLU is ideal if you prioritize a sleeker white aesthetic and specific voltage requirements. It maintains the efficiency benefits of inverter technology while offering a different form factor that may suit certain inground installations better than the GRAT’s top-discharge design.

AQUASTRONG Dual-Mode Inverter Pool Heat Pump

The AQUASTRONG Dual-Mode Inverter Pool Heat Pump is designed for owners who need a taller unit, standing 25.6 inches high. It weighs 117 pounds, making it heavier than the GRAT model. Both units offer smart app control and dual-mode temperature management for large pools. The AQUASTRONG model is white and fits above-ground or inground setups. While the GRAT provides top-discharge flexibility, the AQUASTRONG offers a different dimensional profile. You should consider this alternative if your installation space requires a specific height or if you prefer a white cabinet. It delivers similar inverter efficiency and smart features, ensuring consistent water temperatures for your pool environment.

Varpoolfaye 65,000 BTU Inverter Pool Heat Pump

The Varpoolfaye 65,000 BTU Inverter Pool Heat Pump offers slightly less heating power than the GRAT’s 75,000 BTU but maintains a high COP rating for efficiency. It serves pools up to 21,000 gallons and includes app control for remote management. The unit is shorter, standing at 25.7 inches high, and weighs less than the GRAT model. It operates on 220V and features a compact design. If you need efficient heating for large inground pools and value a smaller footprint, this is a strong option. It sacrifices some raw BTU output but retains smart connectivity and quiet operation, making it suitable for users who prioritize efficiency over maximum heating speed.

TURBRO 50,000 BTU Inverter Pool Heat Pump

The TURBRO 50,000 BTU Inverter Pool Heat Pump is tailored for smaller pools, supporting up to 15,000 gallons compared to the GRAT’s 21,000-gallon capacity. It has lower heating power but offers smart app control and energy efficiency. The unit is black and measures 15.7 by 25.9 inches with a height of 38.5 inches. It operates on 220V power. This alternative is best for owners of smaller pools who do not need the higher BTU output of the GRAT. It provides similar inverter benefits and remote management capabilities. If your pool volume is under 15,000 gallons, this model offers a more appropriately sized solution with comparable smart features and quiet operation.

Pentair WhisperFlo VST Variable Speed Pool Pump

The Pentair WhisperFlo VST Variable Speed Pool Pump is a circulation pump rather than a heater. It delivers variable speed control for energy-efficient operation, differing significantly from the GRAT’s heating function. It supports standard pool sizes and features a beige finish. The unit weighs 46.3 pounds and offers dual-voltage flexibility. This alternative is for users who prioritize energy savings in circulation over heating. It suits those who already have a heating source and need efficient water movement. While it does not provide temperature regulation like the GRAT, it complements heating systems by optimizing pump performance. Choose this if your primary need is efficient circulation rather than water heating.

Quick picks

Our 7 picks

1 Best overall

GRAT 75,000 BTU Inverter Pool Heat Pump

Best for: large pools up to 21,000 gallons

Heating Capacity

75,000 BTU

Pool Capacity

21,000 Gallons

Compressor Technology

Full Inverter

Operational Modes

Heating and Cooling

Connectivity

WiFi and Bluetooth

Use

Poolside, Inground Pools

View on Amazon: GRAT 75,000 BTU Inverter Pool Heat Pump Affiliate link

This GRAT heat pump delivers 75,000 BTU of heating and cooling for pools up to 21,000 gallons. It uses full inverter technology to adjust compressor output, ensuring stable water temperatures and energy efficiency. You can control it remotely via built-in WiFi and Bluetooth. The compact 36x36x36 inch unit features a top-discharge design for flexible installation. It includes a titanium heat exchanger for saltwater resistance.

Pros

• 75,000 BTU heating capacity for large pools
• Full inverter technology for efficient temperature control
• Built-in WiFi and Bluetooth for remote management
• Titanium heat exchanger resists saltwater corrosion
• Top-discharge design saves side clearance space

Cons

• Heavier at 98.1 pounds than many competitors
• Larger footprint than smaller 50,000 BTU units
• No physical remote control included in data

Good fit if

• You need heating and cooling for a pool up to 21,000 gallons
• You want smart control via your smartphone
• You have limited side clearance for installation

Skip if

• You have a pool larger than 21,000 gallons
• You prefer a lighter unit under 90 pounds
• You need a unit with a dedicated physical remote

Verdict: GRAT 75,000 BTU Full Inverter Heat Pump is the best overall pick for owners of large pools who want smart control and efficient heating. It suits those who value top-discharge flexibility and saltwater durability.

2 Best budget

Vidapool 75,000 BTU Inverter Pool Heat Pump

Best for: large pools needing heating and cooling

Heating Capacity

75,000 BTU

Pool Capacity

21,000 gallons

Voltage

220V

Compressor Technology

Inverter

Operational Modes

Heating & Cooling

COP Rating

12

View on Amazon: Vidapool 75,000 BTU Inverter Pool Heat Pump Affiliate link

The Vidapool VTX016 delivers 75,000 BTU of heating power for pools up to 21,000 gallons. It uses inverter technology to adjust output, saving energy and reducing noise to 36 dB. You can control it via an app. It also offers cooling modes. This unit fits pools up to 21,000 gallons. It is a strong alternative to the GRAT 75,000 BTU model.

Pros

• 75,000 BTU heating capacity for large pools
• APP remote control for temperature scheduling
• Dual heating and cooling operational modes
• Quiet 36 dB operation level

Cons

• Larger physical footprint than compact competitors
• No physical display or remote listed in specs
• Higher price point than budget inverter options

Good fit if

• You need a 75,000 BTU unit for a 21,000-gallon pool
• You want cooling capability in addition to heating
• You prefer app-based smart control

Skip if

• You have a pool smaller than 15,000 gallons
• You need a compact unit for tight spaces
• You want a lower-cost inverter heater

Verdict: Vidapool 75,000 BTU Heat Pump matches the top-tier power of the GRAT 75,000 BTU Inverter Pool Heat Pump while adding cooling. It suits large pool owners who want smart control and quiet operation.

3 Best premium

WARMBLU 21,000 Gallon Inverter Pool Heat Pump

Best for: Large inground pools needing quiet efficient heating

Heating Capacity

60,000 BTU

Pool Capacity

21,000 Gallons

Voltage

220V

Compressor Technology

Inverter

COP Rating

16.0

Connectivity

WiFi App Control

View on Amazon: WARMBLU 21,000 Gallon Inverter Pool Heat Pump Affiliate link

The WARMBLU 21,000 Gallon Inverter Heat Pump uses a titanium heat exchanger and inverter compressor to manage large inground pools up to 21,000 gallons. It achieves a Max COP of 16.0 for high efficiency. You control it via a mobile app or touch panel. The unit runs under 50 dB and separates water from electrical components for safety. It fits well for those prioritizing quiet, efficient heating for large volumes.

Pros

• Max COP of 16.0 for high efficiency
• Handles pools up to 21,000 gallons
• Mobile app and touch panel control
• Operation under 50 dB

Cons

• Larger footprint than smaller units
• No remote control listed in specs
• Requires 220V power connection

Good fit if

• You need to heat a large inground pool
• You want app-based temperature control
• You prioritize low noise operation

Skip if

• You have a small pool under 15,000 gallons
• You only have 110V outlets available
• You need a portable unit for above ground pools

Verdict: WARMBLU 21,000 Gallon Inverter Heat Pump delivers high efficiency for large pools with quiet operation. It suits owners of inground pools who want app control and minimal noise.

4 Best 48"

AQUASTRONG Dual-Mode Inverter Pool Heat Pump

Best for: Above-ground pools needing tall 48-inch units

Heating Capacity

75000BTU

Voltage

220V

Compressor Technology

Full DC variable frequency

Operational Modes

Heating and cooling

COP Rating

15.8

Connectivity

Smart WiFi, app control

View on Amazon: AQUASTRONG Dual-Mode Inverter Pool Heat Pump Affiliate link

The AQUASTRONG HEX035 is a 48-inch high pool heat pump designed for above-ground and inground pools up to 21,000 gallons. It uses full DC variable frequency technology to deliver a 15.8 COP rating, offering both heating and cooling modes. You can control the unit remotely via an app or the built-in control panel. This model weighs 117 pounds and operates quietly at 53 dB, making it a practical option for extended swim seasons.

Pros

• High 15.8 COP rating for energy efficiency
• Dual heating and cooling modes
• App and panel control
• Quiet 53 dB operation

Cons

• Heavier 117-pound build
• Requires 220V power connection
• No remote control included

Good fit if

• You need a tall 48-inch unit for above-ground pools
• You want app-based temperature scheduling
• You require both heating and cooling functions

Skip if

• You only have standard 110V outlets
• You need a remote control instead of app management
• You prefer a lighter unit under 100 pounds

Verdict: AQUASTRONG 48" Inverter Pool Heat Pump suits owners of large above-ground pools who want smart app control and efficient dual-mode temperature management.

5 Also great

Varpoolfaye 65,000 BTU Inverter Pool Heat Pump

Best for: Large inground pools needing app control

Heating Capacity

65,000 BTU

Pool Capacity

21,000 gallons

Voltage

220V

Compressor Technology

Inverter

COP Rating

6.6

Use

Poolside, Inground Pools

View on Amazon: Varpoolfaye 65,000 BTU Inverter Pool Heat Pump Affiliate link

This unit offers 65,000 BTU of heating power with a COP of 6.6, making it efficient for pools up to 21,000 gallons. It uses inverter technology to maintain stable temperatures while running quietly at 45dB. The 220V system includes WiFi app control and a touch panel. It fits inground pools and handles saltwater environments. You get a 118-inch cord and 1.5-inch connectors for setup.

Pros

• High COP of 6.6 for energy efficiency
• WiFi app control for remote operation
• Quiet 45dB operation level
• Suitable for saltwater pools

Cons

• Larger footprint than TURBRO 50,000 BTU model
• No physical remote included in specs
• Condensation leak is a normal operational trait

Good fit if

• You want WiFi control for scheduling
• You have a saltwater inground pool
• You need 65,000 BTU heating capacity

Skip if

• You only have a small pool under 15,000 gallons
• You need a unit smaller than 15 inches wide
• You prefer a non-inverter compressor

Verdict: Varpoolfaye 65,000 BTU Inverter Heat Pump suits owners of large inground pools who value app control and quiet operation. Its high COP rating ensures efficient heating for water volumes up to 21,000 gallons.

6 Also great

TURBRO 50,000 BTU Inverter Pool Heat Pump

Best for: smaller pools needing app control

Heating Capacity

50,000 BTU

Pool Capacity

15,000 gallons

Voltage

220-240V

Compressor Technology

Full DC Inverter

COP Rating

16.2

Connectivity

Wi-Fi app control

View on Amazon: TURBRO 50,000 BTU Inverter Pool Heat Pump Affiliate link

The TURBRO 50,000 BTU Inverter Pool Heater uses a full DC inverter compressor to adjust heating power based on ambient conditions. It supports pools up to 15,000 gallons with a COP rating of up to 16.2. You can control it via a mobile app or the local panel. This unit is designed for pools 60°F or warmer and includes smart sensors for safety.

Pros

• Full DC inverter compressor for stable temperature
• Mobile app and timer control
• Titanium heat exchanger resists corrosion
• COP rating up to 16.2

Cons

• Lower heating capacity at 50,000 BTU
• Smaller pool capacity at 15,000 gallons
• Requires professional hardwired installation

Good fit if

• You need app-based scheduling for your pool
• You have a pool under 15,000 gallons
• You want corrosion-resistant titanium components

Skip if

• You have a pool larger than 15,000 gallons
• You cannot hire a certified electrician
• You need more than 50,000 BTU of heat

Verdict: TURBRO 50,000 BTU Inverter Pool Heater suits smaller pools where app control and energy efficiency matter more than raw heating power. It works best for owners who can handle professional electrical setup.

7 Best variable speed

Pentair WhisperFlo VST Variable Speed Pool Pump

Best for: Energy-efficient pool circulation

Voltage

115v/208-230v

Use

Poolside

Speed

Variable Speed

Dimensions

5 × 5 × 5 inches

Weight

46.3 pounds

View on Amazon: Pentair WhisperFlo VST Variable Speed Pool Pump Affiliate link

This is a Pentair WhisperFlo VST variable speed pool pump. It features a 2.6 THP motor and supports 115V and 208-230V power. The unit weighs 46.3 pounds and measures 5 inches in width, height, and length. You should consider this if you need a reliable, energy-efficient pump for your pool system. Its variable speed technology allows for precise flow control.

Pros

• Variable speed motor for energy efficiency
• Dual voltage support (115V/208-230V)
• 2.6 Total Horsepower rating
• Compact 5-inch cubic dimensions

Cons

• Heavier build at 46.3 pounds
• Standard beige color option only
• No digital display mentioned in specs

Good fit if

• You want to reduce energy costs
• You need a 2.6 THP pump
• You have 208-230V electrical access

Skip if

• You need a lightweight pump under 30 lbs
• You require a 115V-only connection
• You want a compact size smaller than 5 inches

Verdict: Pentair WhisperFlo VST Variable Speed Pump delivers efficient operation for pools needing variable speed control. It suits users prioritizing energy savings and dual-voltage flexibility over compact size or lightweight design.

Specifications side by side

Frequently asked questions

See also

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• rovsun 8000 btu inverter window alternatives