Hayward – Universal H-Series, Low NOx, 250K BTU, Natural Gas, Pool & Spa Heater

The Hayward W3H250FDN Universal H-Series is engineered to deliver powerful, energy-efficient heating performance for both pools and spas. Featuring a robust 250,000 BTU output, this natural gas heater provides fast temperature rise with exceptional fuel savings. Designed with Low NOx emissions, it meets strict air quality standards — making it a smart choice for environmentally conscious homeowners.

With its durable polymer header and corrosion-resistant heat exchanger, the W3H250FDN is built for longevity even in coastal or saltwater environments. A digital LED control panel ensures precise temperature management and user-friendly operation.

Key Features

• 250K BTU Heating Performance — Quickly heats medium-to-large pools and spas

• Low NOx Emissions — Meets environmental regulations and promotes cleaner operation

• Cupro-Nickel Heat Exchanger — Superior resistance against corrosion and chemical damage

• Energy-Efficient — Reduces fuel costs while maintaining powerful heating output

• Universal Installation — Works with most existing plumbing and system layouts

• Digital Temperature Control Panel — Easy monitoring and precise temperature regulation

• Polymer Header Design — Enhances flow and improves durability

• Reliable Ignition System — Consistent starts with minimal maintenance

Benefits

• Extend your swim season with rapid heating performance

• Lower operating costs thanks to efficient combustion technology

• Long-lasting durability in harsh and saltwater environments

• Maintains consistent water comfort with simple digital controls

• Reduced environmental footprint compared to traditional heaters

• Ideal for retrofit and new installations

• Designed for residential pools and spas