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 W3H150FDN Universal H-Series 150,000 BTU Natural Gas Pool and Spa Heater is designed to deliver reliable and efficient heating for in-ground pools and spas. One of its key strengths is the 150,000 BTU rating, which is suitable for medium-sized pools, allowing for quick and effective heating. The efficiency is enhanced by the industry-leading hydraulic design that reduces circulation pump run time, resulting in energy savings.

Another strength is the durable cupro nickel heat exchanger, which offers excellent protection against corrosion, making it a good choice for those with potentially unbalanced water chemistry. This feature contributes to the heater's longevity and reliability. The heater uses natural gas, making it a cost-effective option for those with access to this type of fuel. It also meets low NOx emissions standards, ensuring it has a low environmental impact, which is beneficial for eco-conscious users.

The control features are user-friendly, with front-panel-only access and an intuitive control pad that simplifies operation, service, and maintenance. The Hayward W3H150FDN is a solid option for medium-sized pool and spa owners looking for efficient, durable, and environmentally friendly heating solutions.

The MasterTemp EC-462027 Pool Gas Heater is a strong contender in the pool heater market. One of its key strengths is its impressive heating capacity with 250,000 BTU, making it suitable for quickly warming up your pool. It uses propane as its fuel type, which is generally efficient and effective for pool heating needs. Another significant advantage is its premix combustion technology that helps achieve fast and efficient warm-ups, ensuring you don't have to wait long to enjoy a warm pool.

The heater's controls are user-friendly and intuitive, simplifying operation for those who may not be tech-savvy. Its rotatable controls add to its convenience, allowing for flexible installation in various settings. Speaking of installation, the unit is certified for both indoor and outdoor use, offering versatility depending on your setup. Durability is another highlight, with a tough, rust-proof exterior designed to withstand the elements, ensuring long-term use.

Built-in safety features like overheat protection and tip-over protection provide peace of mind, reducing risks during operation. On the flip side, the unit is relatively heavy at 146.7 pounds, which might make installation challenging without assistance. It also ranks #92 in Swimming Pool Heaters, suggesting there is room for improvement in popularity and perhaps market penetration. This pool heater is a solid choice for someone looking for a durable and efficient pool heater, especially if you need a robust BTU output and user-friendly features.