10 Best Immersion Heater For Pool 2025 in the United States

The FibroPool Swimming Pool Heat Pump FH285-i is a high-efficiency, all-electric heater designed for both above and in-ground pools. With a power output of 85,000 BTU, it effectively warms pools up to 17,500 gallons for in-ground and up to 27-foot round or 18 by 33-foot oval for above-ground pools. Utilizing next-generation full inverter technology, it operates efficiently even at lower temperatures, reducing electricity usage and costs.

The heat pump is environmentally friendly, relying on clean electricity instead of natural gas or propane, making it a green choice for pool heating needs. Its rugged, weather-resistant design ensures durability and longevity, with a compact profile that offers flexible mounting options. Installation is straightforward with included fittings, and the digital control panel with Wi-Fi and app integration allows for easy temperature adjustments and monitoring from your phone.

It is best suited for humid climates and may not perform as well in dry climates below 55 degrees. Weighing 175 pounds and with dimensions of 28 x 26 x 37 inches, it is relatively heavy, which may be a consideration for installation and maintenance. The FibroPool FH285-i offers a blend of efficiency, ease of use, and environmental benefits, making it a solid choice for pool owners looking to extend their swimming season without a significant increase in energy costs.

The Dr Infrared Heater DR-650HP Full DC Inverter Heat Pump is a strong option for those with in-ground or above-ground pools up to 18,000 gallons. With a power output of 65,000 BTU and a voltage requirement of 208 - 230 Vac, this heat pump is energy-efficient, converting 3.39 kilowatts to a substantial amount of heat. The variable power setting, adjusting between 20% - 100%, ensures energy savings and tailored heating performance.

Its twin rotary compressor reduces vibration and noise, making it quieter and more durable, which is reinforced by its CSA and AHRI certifications. The built-in WiFi for remote control via an app is a convenient feature, though it may require some tech-savviness to set up initially. Safety is addressed with features like Soft-Start, which helps prolong the unit's life by reducing startup strain. However, at 137 pounds and dimensions of 37.8 x 16.5 x 25.9 inches, it might be bulky and require significant space for installation.

The USA-based customer support is a bonus, offering reliable assistance. Ideal for larger pool owners looking for a durable, energy-efficient heating solution with modern connectivity features, but be prepared for some upfront effort in setting up and installing the unit.

The FibroPool FH135 Swimming Pool Heat Pump is a high-efficiency, electric heater designed for both above-ground and in-ground pools and spas. One of its standout features is its environmentally friendly design, as it runs on electricity and transfers heat from the air to the water, making it cost-effective and easy to maintain. This model is suitable for in-ground pools up to 7,500 gallons and above-ground pools up to 18-foot round or 12 by 24-foot oval, although it performs best in humid climates and may not be ideal for dry areas where traditional gas heaters might be better suited.

The heat pump is built for durability with an enamel-coated steel chassis that withstands outdoor conditions, and its slim profile offers flexible installation options. For user convenience, it includes a digital control panel that's easy to read and operate, with an optional extension cable for flexible placement. Despite its robust features, it weighs 98 pounds, which may require some effort during installation.

This heat pump is an excellent choice for those looking for an eco-friendly and efficient pool heating option, as long as they are in the right climate for optimal performance. However, its effectiveness might be limited in colder, dry climates, and it is best used in areas that stay above 50 degrees.