The Best GRAT Pool Heat Pumps in 2026: 2 Picks
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Finding the best GRAT pool heat pumps requires comparing their published specifications. We evaluated 2 models to help you choose the right unit for your needs. The top pick is the GRAT 75,000 BTU Full Inverter Pool Heat Pump because it offers smart app control and durable titanium components for medium pools. GRAT offers poolside units in gray with varying dimensions and capacities up to 21,000 gallons. These picks are based strictly on the specs provided in the listings, ensuring you get accurate data for your decision.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | GRAT 75,000 BTU Full Inverter Pool Heat Pump Best overall | Medium pools needing smart heating and cooling | Check price of GRAT 75,000 BTU Full Inverter Pool Heat Pump on Amazon |
| 2 | GRAT 75,000 BTU Inverter Pool Heat Pump Best budget | Small pools needing smart inverter heating | Check price of GRAT 75,000 BTU Inverter Pool Heat Pump on Amazon |
Our 2 picks
GRAT 75,000 BTU Full Inverter Pool Heat Pump
Best for: Medium pools needing smart heating and cooling
- Heating Capacity
- 75,000 BTU
- Pool Capacity
- 21,000 Gallons
- Compressor Technology
- Full Inverter
- Operational Modes
- Heating & Cooling
- Connectivity
- WiFi, Bluetooth
- Control Type
- App Control
View on Amazon: GRAT 75,000 BTU Full Inverter Pool Heat Pump Affiliate link
This GRAT heat pump offers 75,000 BTU of heating and cooling for pools up to 21,000 gallons. Its full inverter compressor adjusts output for steady temperatures and lower energy use. You control it via a mobile app using WiFi or Bluetooth. The titanium heat exchanger resists corrosion in saltwater or freshwater. It runs quietly at 50 dB and features automatic defrost for cooler weather.
Pros
- Full inverter compressor for efficient, stable heating
- Titanium heat exchanger for saltwater compatibility
- Smart app control with WiFi and Bluetooth
- Quiet operation at 50 dB
Cons
- Bluetooth required for initial pairing
- Only supports 2.4GHz WiFi networks
- Cooling mode limited to 45°F–82°F
Good fit if
- You have a pool up to 21,000 gallons
- You want smart remote control via an app
- You need corrosion resistance for saltwater
Skip if
- You have a pool larger than 21,000 gallons
- You only have 5GHz WiFi available
- You want heating only without cooling
Verdict: GRAT 75k BTU Inverter Pool Heat Pump suits owners of medium-sized pools who want quiet, smart-controlled heating and cooling. Its inverter technology and titanium exchanger make it a durable option for both freshwater and saltwater setups.
GRAT 75,000 BTU Inverter Pool Heat Pump
Best for: Small pools needing smart inverter heating
- 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 offers 75,000 BTU of heating and cooling power for pools up to 21,000 gallons. It uses full inverter technology to adjust compressor output, improving energy efficiency and maintaining stable water temperatures. Smart WiFi and Bluetooth connectivity let you control settings from your smartphone. The compact top-discharge design fits various installation spots, while a titanium heat exchanger resists corrosion in saltwater or freshwater pools.
Pros
- 75,000 BTU heating capacity for 21,000 gallon pools
- Full inverter compressor for energy efficiency and stable temperatures
- Built-in WiFi and Bluetooth for remote smartphone control
- Top-discharge design requires less side clearance for installation
- Titanium heat exchanger resists saltwater corrosion
Cons
- Heating capacity limits use to pools up to 21,000 gallons
- Gray cabinet may not match all outdoor decor styles
- No dedicated physical remote control included
Good fit if
- You have a pool up to 21,000 gallons
- You want to control temperature via smartphone
- You need a unit for both heating and cooling
Skip if
- You have a pool larger than 21,000 gallons
- You prefer side-discharge airflow for specific clearance
- You do not have WiFi access for setup
Verdict: GRAT 75,000 BTU Inverter Heat Pump suits owners of smaller pools who value smart control and corrosion-resistant components. It delivers efficient heating and cooling without requiring extensive side clearance for installation.
Specifications side by side
| Spec | GRAT 75,000 BTU Full Inverter Pool Heat Pump | GRAT 75,000 BTU Inverter Pool Heat Pump |
|---|---|---|
| Heating Capacity | 75,000 BTU | 75,000 BTU |
| Pool Capacity | 21,000 Gallons | 21,000 Gallons |
| Compressor Technology | Full Inverter | Full Inverter |
| Operational Modes | Heating & Cooling | Heating and Cooling |
| Connectivity | WiFi, Bluetooth | WiFi and Bluetooth |
| Control Type | App Control | not stated |
| Use | Poolside, Inground Pools | Poolside, Inground Pools |
| Capacity | 21,000 Gallons | 21,000 Gallons |
| Dimensions | 34 × 18 × 22 inches | 36 × 18 × 36 inches |
| Weight | not stated | 98.1 pounds |
| Color | Gray | Gray |
| Model | GTHP2109CSA32 | Sphp-120 |
| Size | not stated | 21,000 Gallons |
GRAT Heat Pump Lineup Overview
The GRAT lineup focuses on inverter technology for efficient heating and cooling. The top pick, the GRAT 75,000 BTU Full Inverter Pool Heat Pump, features app control and a titanium exchanger. It suits owners of medium-sized pools who want smart management and quiet operation. Its compact dimensions help it fit in tighter spaces.
The second option is the GRAT 75,000 BTU Inverter Pool Heat Pump, rated for 21,000-gallon pools. It targets smaller pools and values smart inverter heating. This unit offers corrosion-resistant components and requires less side clearance. Both models use gray finishes and poolside installation. You can choose based on your pool size and desired control features.
Where GRAT Fits Your Pool
GRAT offers two inverter heat pumps for residential pools. The lineup starts with a model sized for 21,000-gallon pools. This unit measures 36 by 18 by 36 inches. The top pick handles medium pools with a 75,000 BTU output. It measures 34 by 18 by 22 inches. Both units provide app control for remote management. They use titanium exchangers for durability in saltwater or freshwater. You will not find larger capacity options or manual-only controls in this specific range. The selection focuses on efficient, smart-controlled heating for smaller to medium-sized installations.
Choosing the Right Heat Pump
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Check pool capacity
Match the unit to your water volume. The GRAT 75,000 BTU Inverter Heat Pump is rated for pools up to 21,000 gallons. This makes it suitable for smaller setups. Larger pools may need higher output. Ensure the gallon rating meets your needs. This prevents underheating or wasted energy. Verify the capacity before buying. It is a key spec for performance. Smaller units work best for compact yards.
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Verify app control
Look for smart features if you want remote management. The top pick includes app control for easy adjustments. This allows you to change settings from your phone. You can monitor temperature without going outside. Smart control adds convenience for busy owners. Check the control type in the specs. Not all units offer this feature. App control helps you save energy by adjusting heat only when needed.
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Measure installation space
Check the dimensions before placing the unit. The second model measures 36 by 18 by 36 inches. Ensure you have enough room for airflow. Proper spacing prevents overheating and improves efficiency. Compare the width and height to your area. The top pick is 34 inches long. Measure your poolside space carefully. Tight spots may require a more compact unit. Leave room for maintenance access.
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Consider weight limits
Check the weight if your deck has limits. The second model weighs 98.1 pounds. This is important for elevated structures. Ensure your surface can support the load. Heavier units may need a concrete pad. Lighter models are easier to move. Check the weight spec in the data. This helps you plan your installation site. Proper support ensures long-term stability and safety.
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Review material specs
Look at the build quality for durability. The top pick features a titanium exchanger. This resists corrosion in saltwater pools. It also works well in freshwater. Titanium is strong and long-lasting. Check the materials listed in the specs. Corrosion-resistant parts extend the unit's life. This is vital for outdoor equipment. Durable materials reduce maintenance costs over time.
Frequently asked questions
Which GRAT heat pump is best for medium-sized pools?
The GRAT 75,000 BTU Full Inverter Pool Heat Pump is the top choice for medium pools. It includes app control for remote management and uses a titanium exchanger. This construction supports durability in both freshwater and saltwater environments. Its compact dimensions of 34 by 18 by 22 inches fit well in various poolside settings.
What is the maximum pool size for the GRAT 75,000 BTU Inverter model?
The GRAT 75,000 BTU Inverter Pool Heat Pump is rated for pools up to 21,000 gallons. This capacity makes it ideal for smaller setups that require efficient heating and cooling. The unit measures 36 by 18 by 36 inches and weighs 98.1 pounds. It is designed to operate with minimal side clearance during installation.
Does the top-rated GRAT heat pump have smart controls?
Yes, the GRAT 75,000 BTU Full Inverter Pool Heat Pump features app control. This allows you to manage heating and cooling settings remotely. The unit is designed for poolside use and includes a titanium exchanger for long-term reliability. Its gray finish complements most outdoor environments while providing consistent temperature regulation.
Are GRAT heat pumps suitable for saltwater pools?
The GRAT 75,000 BTU Full Inverter Pool Heat Pump is suitable for saltwater setups. Its titanium exchanger provides corrosion resistance, ensuring durability in saline environments. This model is the best overall pick for owners who need smart heating and cooling capabilities. It handles medium-sized pools efficiently while maintaining component integrity over time.
How much space does the GRAT 75,000 BTU Inverter unit require?
The GRAT 75,000 BTU Inverter Pool Heat Pump measures 36 inches in length, 18 inches in width, and 36 inches in height. It is designed to require minimal side clearance for installation. This compact footprint makes it a practical option for smaller pools. The unit weighs 98.1 pounds and is built for stable poolside placement.
What is the difference between the two GRAT heat pump models?
The primary difference lies in their target pool sizes and specific features. The top pick offers app control and a titanium exchanger for medium pools. The second model is rated for 21,000-gallon pools and focuses on efficient inverter heating. Both units are gray and designed for poolside use, but they differ in dimensions and weight.