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 Aquastrong 75,000 BTU Inverter Pool Heat Pump stands out for its strong heating capacity, suitable for large pools up to 21,000 gallons. This means it can quickly warm your pool water even in cooler climates, extending your swimming season comfortably. Its dual heating and cooling modes provide flexibility, allowing you to both heat the water in cold weather and cool it on hot days, a feature not always found in similar products. The inverter technology is a big plus, as it adjusts power use efficiently, resulting in up to 70% energy savings compared to traditional electric heaters. This also helps reduce your electricity bills over time. The heat pump operates quietly at about 53 decibels, which won't disturb your outdoor relaxation. Additionally, it includes an intelligent auto-defrost system that keeps it running smoothly in winter by preventing frost buildup automatically.

Control-wise, it offers WiFi connectivity and an app, letting you adjust temperature settings and program schedules remotely, adding convenience especially if you’re frequently busy or away from home. The unit’s size and weight (218 pounds, about 18×29×43 inches) make it fairly substantial, so you’ll need adequate space for installation, but it comes with versatile connection adapters to fit different pool setups easily. Made with cast iron, the build quality suggests good durability, supported by a 3-year warranty for peace of mind.

The relatively large size and weight might require professional help during installation. While the product excels in efficiency and comfort features, it requires a 220V power supply, which may need specific electrical arrangements if your home doesn't already support it. This heat pump is a solid choice for pool owners looking for efficient, quiet, and year-round temperature control, especially for larger pools and those who value smart app-based operation.

The Aquastrong Inverter Swimming Pool Heat Pump offers a solid heating capacity of 16,000 BTU, making it well-suited for pools up to 5,000 gallons, whether above ground or inground. It excels in energy efficiency, with a high coefficient of performance (COP) of 5.5, which means it uses significantly less electricity compared to standard electric heaters—up to 70% savings—and even outperforms many natural gas heaters in cost efficiency. This can lead to noticeable savings on your energy bills while keeping your pool comfortably warm. Its noise level is impressively low, operating quietly between 38 and 48 decibels, which is quieter than a whisper, so it won’t disturb your outdoor relaxation.

The unit also features an intelligent auto-defrost system that prevents ice buildup automatically, ensuring reliable operation during colder months and extending your swimming season by up to six months. Installation is straightforward, with included hose adapters and conversion kits allowing setup typically in under 10 minutes, and the compact size (about 15 x 13 x 16 inches) won’t require much space. Control options include multi-mode smart panel settings for easy temperature management with a precise thermostat maintaining water temperature within 2°F accuracy.

The build uses durable plastic materials and comes backed by a 3-year warranty plus lifetime technical support, offering peace of mind. While the heat pump is designed for moderate-sized pools, larger pools might need a higher capacity model. Also, its plastic casing is sturdy but might not be as rugged as metal units in very harsh environments. This heat pump is ideal for pool owners seeking an efficient, quiet, and easy-to-install solution to extend their swimming season without incurring high energy costs.