10 Best Natural Gas Pool Heaters 2026 in the United States

The Raypak 406,000 Btu Digital Natural Gas Pool Heater with Cupro Nickel (Model P-R406A-EN-X) boasts a high BTU output of 406,000, making it suitable for heating larger pools efficiently. Its cupro-nickel construction enhances durability, particularly in harsh weather conditions, thanks to its pagoda design. The microprocessor-controlled thermostat allows for precise temperature control, which is a notable feature for maintaining consistent pool temperatures.

Installation may require professional assistance due to its substantial size and weight (249 pounds and dimensions of 44 x 34 x 31 inches), which could be a drawback for some users. This Raypak model is a solid choice for those needing a reliable and powerful pool heater, although potential buyers should consider the installation requirements and ensure that noise is not an issue for their specific needs.

The Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater stands out for its robust heating performance, making it a great choice for large in-ground pools and spas. With a high BTU output of 400,000, it can efficiently heat large volumes of water quickly, ensuring your pool or spa is ready for use when you are. The heater's efficiency is enhanced by its industry-leading hydraulic design, which reduces circulation pump run time, resulting in significant energy savings.

Additionally, the durable cupro nickel heat exchanger offers excellent protection against corrosion, especially in pools with unbalanced water chemistry, extending the heater's lifespan. Ease of use is ensured by the front-panel-only access and intuitive control pad, simplifying operation and maintenance. Furthermore, its low NOx emissions make it an environmentally friendly option, meeting air quality standards in all low-NOx areas.

However, the heater is quite large and heavy, with dimensions of 39.6 x 32.8 x 30.6 inches and a weight of 195 pounds, which may complicate installation and require professional assistance. Additionally, while it performs well, it may be noisier than some other models, which could be a consideration for those seeking a quieter solution.

The Raypak 009218 PR336AENC49 is a natural gas pool heater with a robust 336,000 BTU output, making it suitable for heating larger pools efficiently. Its high BTU rating ensures quick and effective heating, which is a significant advantage for those who want to extend their swimming season.

The heater is designed with an integral fin copper exchanger tube, known for effective heat transfer and durability, contributing positively to its efficiency and longevity. Corrosion-free polymer headers also add to its durability, making it suitable for use in various weather conditions without significant wear and tear.

The backlit LCD controls offer user-friendly operation, allowing easy monitoring and adjustments even in low-light conditions. Additionally, the self-diagnostic microprocessor-controlled ignition simplifies troubleshooting and maintenance, enhancing user convenience. However, at 230 pounds and with package dimensions of 44 x 31 x 31 inches, the unit is quite bulky and may require professional installation, which could add to the cost and complexity. The Raypak 009218 is a solid choice for those needing a powerful and durable pool heater, provided they can manage the installation.