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 Hayward Universal H-Series 200,000 BTU pool heater is a strong choice for in-ground pools and spas needing powerful heating. With 200,000 BTUs, it can quickly warm larger pools, making it suitable for many users. It runs on natural gas and features a durable cupro nickel heat exchanger, which helps resist corrosion—this is great for pools with challenging water chemistry.

The heater also includes an efficient hydraulic design that lowers pump run time, potentially saving on energy costs. Controls are user-friendly with a front-panel access and intuitive pad, simplifying operation and maintenance. Additionally, it meets low NOx emission standards, so it’s better for the environment. On the downside, it's relatively heavy and bulky, which could make installation a bit more complicated.

This heater is well suited for pool owners who want a reliable, efficient natural gas option with easy controls and good durability but should be prepared for a heavier unit during installation.

The MasterTemp EC-462028 is a mid-range pool gas heater designed for both indoor and outdoor use, making it flexible for various installation sites. It features a sturdy rust-proof exterior that promises durability, which is key for outdoor conditions. The premix combustion technology helps the heater warm your pool quickly and efficiently, so you won’t have to wait long for comfortable water temperatures. The controls are user-friendly and can be rotated for easy access, which is a nice touch if you want simple operation without complicated settings.

Weighing 65 pounds and measuring 36 x 30 x 22.5 inches, it is important to consider the space available for installation. This heater suits pool owners looking for a durable, easy-to-use gas heater that offers reliable warming capabilities without overly complex features.