10 Best Natural Gas Pool Heaters 2026 in the United States

The Hayward W3H250FDN is a powerful natural gas pool heater that delivers 250,000 BTUs, making it suitable for in-ground pools and spas needing strong, consistent warmth. Its standout feature is the cupro nickel heat exchanger, which helps resist corrosion and extends the heater’s lifespan, especially if your pool water chemistry isn’t perfectly balanced. This model is designed with energy savings in mind, thanks to an advanced hydraulic system that reduces the time the pool’s circulation pump needs to run.

You’ll find operation and maintenance straightforward with its front-panel access and easy-to-use control pad. It also meets low NOx emissions standards, meaning it’s more environmentally friendly and better for areas with strict air quality rules. The size is fairly standard for this type of heater, weighing 165 pounds and requiring some space for installation, so professional setup might be necessary. At nearly 33 inches in each dimension, it’s not the most compact option available.

If you want a reliable, efficient heater with a focus on durability and lower environmental impact, this model presents a strong option. However, if space constraints or ultra-quiet operation are priorities, you might want to explore other choices.

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 206,000 BTU Digital Electronic Ignition Natural Gas Pool Heater is a robust option for pool owners seeking efficiency and reliability. With its high BTU output, it is well-suited for heating medium to large-sized pools, ensuring quick temperature adjustments. The digital electronic ignition adds convenience, automatically starting the heater only when necessary, which is both energy-efficient and safe.

One of the heater's standout features is its durability. It's designed to withstand various weather conditions, making it a good choice for outdoor installations. The use of advanced materials ensures it doesn't retain heat after shutdown, negating the need for metal heat sinks and contributing to a more straightforward installation process.

Potential buyers should consider its size and weight. At 187 pounds and dimensions of 40 x 28 x 20 inches, it requires sufficient space for installation and might need professional help to set up. The heater is praised for its small footprint relative to its power, but installation logistics should be planned. The Raypak heater's combination of power, convenience, and reliability make it a strong contender for those needing a dependable pool heating solution, provided the installation considerations are managed.