10 Best Immersion Heater For Pool 2025 in the United States

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.

The FibroPool Swimming Pool Heat Pump FH270 offers impressive power with a 70,000 BTU output, making it suitable for both above-ground and in-ground pools and spas. It operates on a 240-volt circuit, ensuring robust performance and efficiency. The use of clean electricity to power this heater is environmentally friendly and cost-effective, as it avoids the higher expenses associated with natural gas or propane heaters.

The high-pressure differential compressors and titanium heat exchangers contribute to its high efficiency, promising lower energy bills while maintaining optimal performance in humid climates down to 50 degrees. However, it's less effective in dry climates, where traditional gas heaters might be preferable. The enamel-coated steel chassis adds durability, designed to withstand outdoor elements across seasons.

Installation is user-friendly with the included 1 1/2 inch compression fittings, although it requires a 240-volt circuit, which might need professional assistance. The digital control panel is straightforward, allowing easy temperature settings and monitoring, with an optional extension for flexible control placement. This heat pump is ideal for eco-conscious users seeking an efficient and durable heater for humid climates. The ease of operation and maintenance further enhances its appeal, though installation might require electrical expertise.

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.