10 Best Electric Pool Heaters 2025 in the United States

The Aquastrong 35,000 BTU Inverter Swimming Pool Heat Pump is designed to efficiently heat pools up to 9,000 gallons, suitable for both above-ground and inground pools. It provides strong heating capacity to quickly warm your water and includes a cooling function for comfortable swimming temperatures throughout the year. The inverter technology dynamically adjusts power use to save about 70% energy compared to traditional electric heaters and operates more efficiently than many gas heaters, resulting in lower electricity bills while maintaining a cozy pool environment.

Installation is straightforward with multiple connection options compatible with common pool plumbing sizes. The unit is manageable in size but weighs about 117 pounds, so assistance may be needed during setup. Constructed with durable materials like cast iron, the heat pump ensures long-lasting use. It operates quietly at around 48 decibels, preserving your backyard tranquility, and features an automatic defrost function to maintain performance during colder months.

Control is convenient through a smartphone app and an onboard panel, enabling remote setting adjustments and scheduling. Considering its efficient, year-round temperature control combined with easy app-based management and quiet operation, this heat pump offers a reliable solution for pool owners seeking consistent comfort.

The Hayward W3H250FDN Universal H-Series 250,000 BTU Natural Gas Pool and Spa Heater is a strong performer in the electric pool heater category. With a substantial heating capacity of 250,000 BTUs, it’s well-suited for heating both in-ground pools and spas. This model stands out with its energy efficiency, thanks to an industry-leading hydraulic design that reduces the circulation pump run time, leading to significant energy savings. The heater’s size (33.3 x 32.8 x 30.6 inches) and weight (165 pounds) are notable and may require professional installation due to its bulk.

However, the front-panel-only access and intuitive control pad simplify operation, service, and maintenance, making it user-friendly once installed. Durability is another strong point, with a cupro nickel heat exchanger that offers excellent protection against corrosion and premature failure, even in the face of unbalanced water chemistry. Additionally, it meets low NOx emission standards, making it environmentally friendly. Despite its higher rank, some users may find the upfront cost and potential installation challenges as drawbacks. This heater is highly suitable for those needing a reliable, efficient, and durable solution for their pool or spa heating needs.

The ECOPOOLTECH EU70 Electric Pool Heater is a solid choice if you want to enjoy your pool longer in the year, especially for pools up to 6,500 gallons like many above-ground pools. It provides a decent heating capacity of up to 22,462 BTUs, which can warm your pool water up to 105°F depending on outdoor temperature. This model is energy-efficient thanks to its heat pump technology, boasting a high heat conversion rate (COP 4.7), meaning it uses electricity quite economically compared to traditional heaters. It operates quietly, which is great if you want to keep noise levels low around your pool area.

Installation is straightforward for both above-ground and some inground pools, but keep in mind the unit weighs 76 pounds and requires space compatible with its size (28 x 17 x 12 inches). The built-in flow sensor and automatic temperature control make it easy to use—once set, the heater maintains your desired pool temperature without much fuss. The build quality appears reliable for outdoor use. Some minor downsides include that it’s best suited for medium-sized pools and may struggle to heat larger pools efficiently. Also, while it runs quietly, it does require a 120V electric outlet, so ensure your setup supports this.

If you want an energy-saving, user-friendly heater to extend your swim season without complicated controls, the ECOPOOLTECH EU70 is a fitting option for small to medium pools.