8 Best Natural Gas Pool Heaters 2025 in the United States

The Raypak Digital 266,000 BTU Natural Gas Pool Heater stands out with its strong heating capacity, making it suitable for medium to large pools, especially in areas with elevations between 2,000 to 6,000 feet. The high BTU output allows for quick heating, ensuring that your swimming experience remains enjoyable even in cooler conditions. One of its notable strengths is the LCD digital display, which not only provides an accurate temperature reading but also offers insights into the heater's operational status and diagnostics, helping you to manage and maintain the unit effectively.

In terms of efficiency, the Unitherm governor plays an important role in preventing condensation, which can enhance the heater's longevity and performance. The materials used, including corrosion-resistant headers, contribute to the unit's durability, especially in varying weather conditions, and make it a solid choice for long-term use.

Weighing in at 230 pounds, installation may require additional help due to its size and weight. Furthermore, while it features high-wind resistance, this heater may not perform as well in extremely windy conditions as some other models designed for such environments. For those who prioritize robust heating capability and easy-to-use digital controls, the Raypak model offers a good balance of features. Potential buyers should ensure they have the proper setup for its size and weight, and consider the installation location regarding wind exposure. It is a reliable option for pool owners looking for a natural gas heater with a good mix of performance and durability.

The Hayward W3H150FDN Universal H-Series Natural Gas Pool Heater is designed for those seeking effective heating for in-ground pools and spas. With a solid BTU output of 150,000, it can heat water quickly, making it suitable for both small and large pools. One of its major strengths is its durable cupro nickel heat exchanger, which protects against corrosion and extends the heater's lifespan, especially in areas with unbalanced water chemistry. This feature is particularly beneficial for pool owners looking for long-term reliability.

Energy efficiency is another highlight, thanks to its advanced hydraulic design that minimizes circulation pump run time, ultimately leading to cost savings on your energy bills. Users will also appreciate the front-panel access and intuitive control pad, which simplify operations and maintenance, making it friendly for all skill levels.

On the downside, the heater is relatively heavy at 150 pounds, which might pose challenges during installation, especially for those who prefer a DIY approach. While the low NOx emissions are great for environmental considerations, some users might find the noise level slightly higher compared to other models. For pool owners who prioritize durability, energy savings, and ease of use, the Hayward W3H150FDN is a strong contender. However, those sensitive to noise or looking for a lighter unit may want to explore alternative options.

The Raypak Millivolt Propane Swimming Pool Heater, with a 406,000 BTU output, is a powerful option for heating your pool. This high BTU output makes it suitable for larger pools, ensuring quick and efficient heating. The heater's efficiency is notably high, which means it can heat the pool effectively while using less energy, potentially saving you on fuel costs in the long run.

The polyester-coated, non-corrosive cabinet adds to its durability and makes it more resistant to outdoor elements compared to standard metal cabinets. Additionally, the copper heat exchanger is known for excellent heat transfer and longevity, further enhancing durability. The option for digital electronic ignition or a millivolt design offers flexibility based on your preference and installation needs.

The low-profile design ensures that it blends well with your outdoor setup and drafts naturally for outdoor installations. The Raypak heater is a robust option for those needing a powerful, efficient, and durable pool heater, particularly for larger pools.