Hayward W3H135FDN H-Series Pool Water Heater/Spa Heater, 135k BTU, Natural Gas Model

Take your pool and spa comfort to the next level with the Hayward W3H135FDN H-Series Pool/Spa Heater, a 135,000 BTU Natural Gas Heater, the perfect balance of power, efficiency, and long-term durability. Designed for homeowners, pool owners, and spa owners who want dependable heating and fast heating without complicated controls, this natural gas pool heater delivers rapid water heating and superb energy performance—so you spend more time relaxing and less time waiting for your water to heat. Built to heat pool water and also used to heat spa water, it helps give you consistent water temperature control throughout the swim season. At the heart of the system is a durable cupro-nickel heat exchanger, engineered to handle demanding pool chemistry while resisting corrosion for long-lasting reliability. Combined with industry-leading hydraulic efficiency, this heater moves water more effectively, helping you reach your desired temperature faster and with less energy use. The intuitive digital control panel of this Hayward pool heater for above ground pool gives you complete command at your fingertips. With easy-to-read indicators and straightforward temperature adjustments, enjoying the perfect water temperature has never been simpler. Whether you’re heating a spa for nighttime relaxation or warming your pool for early-season swimming, the W3H135FDN is built to deliver. Eco-conscious homeowners will appreciate the heater’s Low NOx, clean-air compliant combustion system, which reduces emissions while still producing powerful, consistent heat output. This pool warmer is a smart choice for both comfort and sustainability. Engineered with Hayward’s exclusive “Totally Managed” water flow technology, it protects internal components, reduces maintenance requirements, and enhances overall efficiency. Durable construction, reliable performance, and easy operation make it an ideal solution for extending your swim season and maximizing pool enjoyment.

• Powerful 135,000 BTU Heating for Faster Warm-Ups: Enjoy warmer, more comfortable water quickly thanks to industry-leading hydraulic performance and fast speed-to-heat capability of this gas pool heater, perfect for extending your swimming season
• Durable Cupro-Nickel Heat Exchanger for Long-Term Reliability: This above ground pool heater is built with a robust cupro-nickel heat exchanger designed to resist corrosion and withstand demanding pool and spa environments season after season
• Energy-Efficient & Low NOx for Clean, Eco-Friendly Operation: This gas heater features low-emission combustion technology that meets clean air quality standards, helping reduce environmental impact while lowering operating costs
• Intuitive Digital Control Panel for Easy Operation: This natural gas heater’s user-friendly electronic interface and digital control panel make it simple to set temperatures, monitor performance, and enjoy consistent heating with minimal effort
• Designed for Superior Water Flow & Reduced Maintenance: Hayward water heater for pool with exclusive “Totally Managed” cupro-nickel water flow system enhances performance while helping protect critical components—maximizing efficiency and longevity