10 Best Pool Gas Heaters 2025 in the United States

The Hayward W3H400FDN is a powerful gas pool heater, boasting a robust 400,000 BTU output which makes it suitable for large in-ground pools and spas. One of its standout features is the durable cupro nickel heat exchanger, designed to resist corrosion and ensure longevity, which is particularly beneficial for pools with fluctuating water chemistry. Its energy-efficient hydraulic design is a plus, as it minimizes the run time required by your circulation pump, potentially leading to lower energy costs over time.

Control-wise, the heater offers a user-friendly front-panel access and an intuitive control pad, making it easy to operate and maintain. This aspect can be particularly advantageous for pool owners who may not be very tech-savvy. Additionally, the unit adheres to low NOx emissions standards, making it an environmentally friendly choice in areas where air quality is a concern.

There are some considerations to keep in mind. Weighing in at 195 pounds and measuring nearly 40 inches in length, this heater may require significant space for installation and might be cumbersome to handle without proper equipment. If you have a larger in-ground pool or spa and prioritize efficiency and durability, the Hayward W3H400FDN is a strong contender in the pool gas heater market, provided you have the space for setup and installation.

The Raypak 266,000 BTU Digital Electronic Ignition Natural Gas Pool Heater is a solid choice for those looking to efficiently heat their swimming pools or spas. Rated at 266,000 BTUs, it offers robust heating power, making it suitable for larger pools. One of its strengths is its efficiency; the intermittent spark ignition ensures the pilot light only activates when needed, which can save on gas usage. It also features a programmable thermostat, adding convenience for users who want to maintain a consistent water temperature.

Durability is another highlight, as the heater is built to withstand various weather conditions. The materials used are designed not to retain residual heat, allowing for installation without expensive heat sinks. This feature can save on initial setup costs and is particularly beneficial for outdoor environments.

There are a few considerations to keep in mind. While the heater's size is manageable, weighing 210 pounds, installation may require professional assistance, especially for those unfamiliar with gas-powered equipment. In terms of gas type, it uses natural gas, which is convenient if you have access to a natural gas supply but may not be suitable for those preferring propane or electric options.

The Raypak 206,000 BTU Digital Electronic Ignition Natural Gas Pool Heater is designed for those looking to heat their swimming pools efficiently. With a substantial BTU output, it can effectively warm pools of various sizes, making it a solid choice for both residential and commercial setups. One of its notable strengths is the intermittent spark ignition system, which enhances safety and efficiency, as the pilot light only activates when heating is needed. This feature can help reduce gas consumption and save on energy bills.

The heater is constructed from advanced materials that prevent heat retention, eliminating the need for expensive metal heat sinks. This not only simplifies installation but also contributes to its high efficiency and compact design, which is ideal for those with limited space. Additionally, its durability means it can withstand various weather conditions, providing reliable performance throughout the year.

While the heater may not be the most popular choice among consumers, it is still a dependable option. At 187 pounds and with dimensions of 40 x 28 x 20 inches, it may require assistance during installation due to its weight and size. For those seeking an efficient pool heater, Raypak’s offering is worth considering, especially for users who prioritize energy efficiency and durability in their pool heating solution.