10 Best Pool Heaters 2025 in the United States

The Hayward W3HP21405T HeatPro is a heat pump designed for heating pools with a strong 140,000 BTU capacity, which means it can warm a medium to large pool effectively. It uses a titanium heat exchanger, which stands out because it resists corrosion from saltwater and pool chemicals, making it a durable choice, especially if you have a saltwater pool or live near the coast. This model is also designed to operate quietly, so it won’t disturb your outdoor relaxation.

Energy efficiency is a key advantage here—this heat pump uses less electricity compared to traditional pool heaters, helping reduce your energy bills and environmental impact. It also uses less refrigerant, which is better for the environment. These features make it a smart option if you want to keep operating costs and your carbon footprint low.

The unit is fairly large and heavy (weighing 281 pounds), which might make installation a bit more involved, but it’s built to last with low-maintenance materials. It may not be the best fit if you live in very cold climates, as heat pumps generally work best in moderate to warm weather. While not the cheapest pool heater on the market, the energy savings over time can offset the initial investment. This model is a solid choice if you want a reliable, energy-efficient pool heater with quiet operation and good resistance to harsh conditions, but if you’re in a colder area or on a tight budget, you might want to explore other options.

The Aquastrong Inverter Swimming Pool Heat Pump is a powerful and versatile choice for both above ground and inground pools up to 26,000 gallons. With a strong heating capacity of 100,000 BTU, it can quickly raise your pool temperature, making it a great option for larger pools or cooler climates. One standout feature is its dual-mode system, which not only heats but also cools the pool water, allowing you to enjoy comfortable swimming conditions across different seasons. The WiFi-enabled app control adds convenience, letting you adjust settings and schedule heating from anywhere.

Energy efficiency is a major plus here. The inverter technology means it uses less electricity than traditional heaters, boasting about 70% energy savings compared to electric resistance heaters and better efficiency than gas systems. This can save you money on energy bills over time. The unit also runs quietly at 55 decibels, which is roughly the noise level of a normal conversation, and includes an automatic defrost feature that keeps it working smoothly in cold weather.

Installation is designed to be user-friendly with multiple hose and pipe adapters included, fitting a variety of pool setups. The cast iron build suggests durability, and a 3-year warranty offers some peace of mind. On the downside, the unit weighs nearly 200 pounds, so installation might require professional help or extra effort. Also, it operates on 220 volts, meaning it needs the right electrical setup, which could add to installation complexity or costs. This heat pump is ideal for pool owners looking to extend their swim season with efficient, reliable heating and cooling, especially those with larger pools or who want smart control features, though they should be prepared for a somewhat involved initial setup due to size and electrical requirements.

The Raypak 406,000 Btu Digital Natural Gas Pool Heater stands out with its impressive heating capacity, making it suitable for larger pools and spas. With a heating power of 406,000 BTUs, it promises quick and efficient heating, which is ideal for users who want to enjoy their pool or spa without long waiting times. The use of cupro-nickel in the construction is a significant advantage as it enhances the heater's durability and resistance to corrosion, especially in pools with saltwater or high chemical content.

This feature makes it a reliable option for a diverse range of climates, including harsh weather conditions, supported by its robust pagoda design that ensures ongoing operation despite environmental challenges. The microprocessor-controlled thermostat allows for precise temperature management, enhancing user convenience and comfort. However, it's essential to consider that the unit is quite heavy, weighing 249 pounds, which might make installation more challenging and possibly more expensive if professional help is required.

Additionally, while the heater is not discontinued and has a decent customer review rating of 4.0 out of 5 stars, operating costs for natural gas heaters can be higher compared to electric models, potentially impacting long-term expenses. This pool heater is best suited for users with larger pools or spas who need a powerful, durable, and reliable heating solution that can withstand various weather conditions.