10 Best Pool Heat Pump 2025 in the United States

The Aquastrong Inverter Swimming Pool Heat Pump is a solid choice if you're looking to extend your swimming season with reliable pool heating and cooling. Its 75,000 BTU heating capacity makes it capable of warming larger pools up to 21,000 gallons quickly, which is great for both above-ground and inground pools. Thanks to its inverter technology, it operates with a high efficiency (COP of 15.8), meaning it uses less electricity than traditional heaters—this can save you money over time.

The unit is designed to be quiet at around 53 dB, so it won’t be disruptive near your pool area. It also has an intelligent defrost system to maintain performance in colder weather without interruptions. The ability to control the heat pump via a smartphone app or control panel adds convenience, letting you adjust temperatures or set schedules remotely. Installation is flexible with several connection options, and the unit’s cast iron build should offer good durability. However, weighing 216 pounds and measuring 43 inches tall means it’s fairly large and heavy, so plan space accordingly.

Some users might find the initial setup and plumbing connections require professional help. The 3-year warranty provides reliable coverage, and it is advisable to review the included terms. If you want a quiet, energy-efficient heat pump that can both heat and cool and appreciate smart controls, this model fits well while considering its size and installation requirements.

The Aquastrong Inverter Swimming Pool Heat Pump offers a solid 35,000 BTU heating capacity, making it suitable for pools up to around 9,000 gallons. Its inverter technology shines with a high Coefficient of Performance (COP) of 15.8, meaning it heats efficiently while saving up to 70% energy compared to standard electric heaters. This energy efficiency also surpasses many gas heaters, which could help lower your utility bills over time. The heat pump covers both heating and cooling, with temperature control ranging from 47 to 104°F for heating and down to 47–83°F for cooling, allowing use across multiple seasons. The inclusion of WiFi and an app for remote control is a user-friendly feature that lets you schedule and adjust settings without being by the unit.

Noise level is impressively low at 48 dB thanks to variable frequency technology, so it won’t disrupt your outdoor relaxation. The unit’s size (roughly 39" by 17" by 26") is compact enough for most pool equipment setups, and it weighs about 117 pounds, which is manageable for installation with some help. It includes versatile connection options for easy fitting to standard pool plumbing. The durable cast iron construction suggests it’s built to last, and the 3-year warranty adds peace of mind.

The heat pump runs on standard 115V power, which is convenient but might limit performance compared to higher voltage models in very large pools or extreme climates. Also, while 48 dB is quiet, some users sensitive to noise might notice it. Lastly, occasional defrost cycles, though automatic and brief, may slightly interrupt heating during cold spells. This heat pump is an excellent choice for pool owners wanting efficient, year-round temperature control with smart features, especially for medium-sized pools. It balances good power, energy savings, and convenience while being relatively easy to install and maintain.

The Hayward W3H150FDN Universal H-Series 150,000 BTU Natural Gas Pool and Spa Heater is designed for in-ground pools and spas, offering robust heating performance. With a heating capacity of 150,000 BTU, it can efficiently warm up your pool or spa, making it suitable for medium to large-sized installations.

A notable strength is its cupro nickel heat exchanger, which enhances durability and protects against corrosion, especially useful if your pool's water chemistry is often unbalanced. This means the heater is likely to last longer and require less maintenance over time. The industry's leading hydraulic design is another plus, reducing the circulation pump's run time and saving on energy costs. The heater also meets low NOx emission standards, making it environmentally friendly and compliant with air quality standards in low-NOx areas.

Ease of use is ensured with front-panel-only access and an intuitive control pad, simplifying operation, service, and maintenance. However, one potential downside is its size and weight. At 150 pounds and dimensions of 33.3 x 32.8 x 30.6 inches, this unit is quite bulky and may be challenging to install without professional help. Additionally, while it does rank well in the swimming pool heaters category, some users have noted that the customer service and warranty support could be improved. The Hayward W3H150FDN is a powerful and efficient choice for those needing a reliable pool and spa heater, especially if you prioritize durability and energy savings. However, consider the installation complexity and available support when making your decision.