The 11 best pool heaters for in-ground pools of 2025

Extend Your Swim Season: The pool heat pump features a dual-mode heating and cooling system that maintains optimal water temperatures year-round. Precision control ensures heating from 47–104℉ and cooling from 47–83℉, allowing you to enjoy extended swimming sessions through autumn’s crisp chill and spring’s cool mornings.

Rapid Heating & APP Control: Engineered for speed and efficiency, it delivers 75,000 BTU warmth in hours, perfect for large pools, up to 21,000-gallon systems, or chilly climates. Take full control via the app & control panel. Adjust temperatures remotely, track energy use, and program heating schedules to fit your lifestyle.

Inverter Energy Saving: Intelligent heat pump system featuring full DC variable frequency technology delivers 15.8 COP for maximum heating output. Adaptive frequency conversion algorithm dynamically adjusts power in real-time, achieving 70% energy savings over traditional electric heating and 40% higher efficiency than gas systems.

Ultra-Quiet & Auto-Defrost: Variable frequency technology reduces operational noise to just 53 dB, paired with an intelligent defrosting system featuring automatically initiated cycles every 40 minutes that complete the process in just 5 minutes, ensuring uninterrupted winter operation with continuous heating performance.

Easy to Assemble: Our heat pump features 3 versatile connection options designed to integrate with all pools,(1.25" & 1.5" hose adapter, 1.5" adapter conversion kit, 1.5" PVC pipe converter), ensuring hassle-free installation and optimal performance. Enjoy peace of mind with our 3-year warranty. Dive into comfort and reliability.

The Hayward Universal H-Series 250,000 BTU Natural Gas Heater delivers premium heating performance for years of reliable, long-lasting comfort

A durable cupro nickel heat exchanger offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry

Industry-leading hydraulic design reduces circulation pump run time to provide major energy savings

Front-panel-only access and intuitive control pad provide easy operation, service and maintenance

Low NOx emissions meet air quality standards in all low-NOx areas, ensuring low environmental impact

Built to withstand various weather conditions, perfect solution for environments requiring efficiency, convenience and versatility.

Intermittent spark ignition pilot safety controls. Pilot only comes on when there is a call for heat.

Space-age material means the heater won't retain residual heat after it is turned off, allowing it to be installed without the use of costly metal heat sinks.

Part Number: 009217 | Model Number: P-R266A-EN-C

Gas powered and suitable for use with swimming pools and spas

CLEAN AND GREEN: The FH135 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain

COMPATIBLE WITH: In ground pools up to 7,500 gallons and above ground pools up to 18 foot round or 12 by 24 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater

HIGH EFFICIENCY: Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill

RUGGED DESIGN: Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 16"x40"x24", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings

EASY OPERATION: Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you

CLEAN AND GREEN: The FH270 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain

COMPATIBLE WITH: In ground pools up to 15,000 gallons and above ground pools up to 27 foot round or 18 by 33 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater

HIGH EFFICIENCY: Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill

RUGGED DESIGN: Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 13"x38"x27", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings on a 240 volt circuit

EASY OPERATION: Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you

IN-GROUND and ABOVE-GROUND - The 110,000 BTU inverter swimming pool heat pump is recommended for pool sizes up to 32,000 gallons in-ground or above-ground pools. The power-efficient heat pump pool heater is electric powered with an input requirement of 208 - 230 Vac and a current draw between 2.65~25.6A, 0.61~5.9KW. The efficient equivalent of 540%, 5.9 kilowatts will generate 110,000 BTU of heat (the equivalent of 32,237 watts).

MARKET LEADING TECHNOLOGY - The Dr. Heater heat pump is designed with industry-leading technology for top performance and stability. Our Full DC Inverter fan motor and compressor can adjust heating capacity between 20% - 100% for the most efficient operation. The compressor is designed with a twin rotary that operates together to balance the movement of each other for anti-shaking, which is higher efficiency, lower vibration & quieter operation.

EVERLASTING DURABILITY - The Dr. Heater Full Inverter heat pump is certified by CSA and AHRI for the highest quality and stable performance.

WIRELESS CONTROL and SCHEDULING - Built-in WiFi connecting for mobile APP control. Users can easily control the desired temperature and schedule the heat pump to turn on or off in any part of the world. The Dr. Heater heat pump is designed with a Soft-Start function that allows the system to gently boot up, effectively improving the longevity of the unit.

CUSTOMER SUPPORT - USA-based customer support to address all questions and concerns. The product is CSA and AHRI-certified.

CLEAN AND GREEN: The FH255 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain

COMPATIBLE WITH: In ground pools up to 10,000 gallons and above ground pools up to 21 foot round or 15 by 30 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater

HIGH EFFICIENCY: Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill

RUGGED DESIGN: Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 16"x40"x24", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings

EASY OPERATION: Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you

Soak Up The Sun - Heat your pool the natural way with this blue solar blanket! When placed on top of the pool with the bubbles facing down, it traps the warmth from the sun and transfers it to the water.

Keep Refills To A Minimum - Using this above ground pool heater can help minimize evaporation by up to 95%. This translates to significant savings since you don't have to add more water as often.

Cut Down Cleaning Time & Costs - Our pool solar cover also helps keep leaves, dirt, and debris at bay. Cut down time spent on skimming and fishing out impurities and save on cleaning products!

Customize According To Your Needs - This 16x32 feet solar pool cover is suitable for rectangular in-ground and above-ground pools. It can also be trimmed to fit square, round, and kidney-shaped pools.

Storage Made Convenient - Despite its large dimensions, this 12 mil pool solar heater can be easily folded down to a compact size. Simply store it away in your shed or on a shelf when it's not in use.

High-performance, affordable heater with premium features

82% energy efficiency is highest in class

1-1/2 in. Plumbing connection -- ideal for smaller bodies of water, including aboveground pools, spas and inground pools up to 15,000 gallons

Pre-mixed combustion technology for ultra-fast heat up

Easy-to-use digital display/controller

Integral Fin Copper Exchanger Tube

Corrosion-Free Polymer Headers

Backlit LCD Controls

Self-Diagnostic Microprocessor Controlled Ignition

Powerful Performance: With a high-pressure compressor, pool heater heat pump max output of 35100 BTU, a COP of 6.5, ideal for above ground or in-ground pools up to 10000 Gallons, 14/16/18/21/22/23/26 foot pool

Year-Round Comfort: 220v pool heater with both heating (59°F-104°F) and cooling (45°F-86°F) modes, ensuring perfect water temperatures for every season

Smart WiFi Control: Pool heater for above ground pool easily adjust temperature, schedule, and functions via WiFi using the app for seamless control of your pool

Efficient and Quiet: Our pool heat pump operates by absorbing heat from the air and releasing it to the pool, with minimal electricity and works quietly at 53 dB, ensures a peaceful swimming experience

Durable and Easy Setup: Inground pool heater built with a titanium heat exchanger for freshwater or saltwater pools, it features 1.5 inch connectors and a 126 inch power cord for easy setup and use