10 Best Inground Pool Heaters 2025 in the United States

The Hayward W3H150FDN Universal H-Series 150,000 BTU Natural Gas Pool and Spa Heater is designed for in-ground pools and spas, providing reliable and efficient heating. One of its significant strengths is the robust 150,000 BTU heating capacity, making it suitable for small to medium-sized pools and spas. The heater features a durable cupro nickel heat exchanger, offering strong protection against corrosion, which is particularly beneficial if your pool has unbalanced water chemistry. This contributes to its longevity and reliability.

Another advantage is its industry-leading hydraulic design, which reduces the circulation pump run time, leading to substantial energy savings and lower operational costs. Additionally, the unit boasts low NOx emissions, making it environmentally friendly and compliant with air quality standards in low-NOx areas. The front-panel-only access and intuitive control pad make the heater easy to operate, service, and maintain, which is a plus for users who prefer straightforward maintenance.

However, there are some considerations to keep in mind. The heater weighs 150 pounds and has dimensions of 33.3 x 32.8 x 30.6 inches, so proper planning for installation space and potential assistance for setup is necessary. In summary, this heater is a solid choice for those looking for an efficient and durable solution for heating their pool or spa, with the convenience of easy maintenance and energy savings.

The Dr Infrared Heater DR-1100HP offers a powerful heating capacity of 110,000 BTUs, making it suitable for pools up to 32,000 gallons, whether in-ground or above-ground. This high heating capacity ensures efficient warming of large pools, which is a significant strength for pool owners with larger setups.

Another notable feature is its impressive energy efficiency, with the Full DC Inverter technology allowing the heater to operate between 20% and 100% capacity based on demand. This results in lower energy consumption and cost-effective operation, crucial for long-term savings on energy bills. The unit is also equipped with a twin rotary compressor designed for higher efficiency and quieter operation, which enhances user experience by reducing noise and improving stability. The soft start function further contributes to durability, gently booting up the system and prolonging its lifespan.

Wireless control via a mobile app adds convenience, allowing users to manage and schedule heating effortlessly from anywhere. However, the installation and maintenance of this heater may require professional assistance due to its complexity and size, which weighs 276 pounds and has substantial dimensions. The cost of operation, while efficient, could still be a consideration given the electricity requirements. This heater is best suited for pool owners looking for high efficiency, advanced control options, and a powerful heating solution for larger pools.

The MasterTemp Pentair EC-462027 is a propane gas pool heater designed for inground pools. With a heating capacity of 250,000 BTUs, it provides robust and efficient heating, making it suitable for medium to large-sized pools. The heater features premix combustion technology, which allows for fast and efficient warm-ups, ensuring that your pool reaches the desired temperature quickly. Additionally, its rust-proof exterior enhances durability, making it a long-lasting choice for outdoor installations.

The built-in safety features, such as overheat and tip-over protection, ensure the system operates safely, giving you peace of mind. The heater also offers rotatable and intuitive operation controls, simplifying its use and adjustments. Certified for both outdoor and indoor installation, it provides flexibility depending on your setup needs. However, at 146.7 pounds and with dimensions of 35.5 x 29.8 x 23 inches, it requires a considerable amount of space and effort to install.

While the heater is energy-efficient due to its advanced combustion technology, propane as a fuel type might lead to higher operational costs compared to natural gas options. Given its substantial heating capacity and durable construction, this pool heater is best suited for homeowners with medium to large-sized pools seeking a reliable and fast-heating solution, especially in regions where propane is readily available and cost-effective.