Hayward H250FDN Universal H-Series Heater

Hayward W3H250FDN Universal H-Series Natural Gas Pool Heater – 250,000 BTU Low NOx

The Hayward W3H250FDN Universal H-Series is a 250,000 BTU natural gas pool heater built for dependable, efficient heating in residential in-ground pools and spas. It is designed to deliver fast heat-up, steady temperature control, and strong everyday performance without taking up unnecessary space on the equipment pad.

Hayward pairs this heater with a standard cupro nickel heat exchanger for added durability and corrosion resistance, along with a Low NOx combustion system that meets strict clean air standards. For pool owners who want proven gas heat, modern efficiency, and a heater that fits both new and existing setups, the W3H250FDN is a strong all-around choice.

Efficient Heating with Flexible Installation

The Universal H-Series platform is built for real-world backyard equipment pads. Hayward’s hydraulic design helps support efficient system operation, while the forced draft combustion system promotes reliable performance in outdoor conditions. With 2 inch x 2 1/2 inch CPVC union plumbing connections, a compact cabinet, and universal installation flexibility, this heater works well for both replacements and new builds.

Key Features

• 250,000 BTU natural gas heating capacity
• Low NOx design that meets strict clean air standards
• Standard cupro nickel heat exchanger for improved corrosion resistance
• 83% thermal efficiency
• Forced draft combustion system for dependable heating performance
• 2" x 2 1/2" CPVC union plumbing connections
• 25 to 125 GPM operating flow range
• 120/240V compatibility
• Compact footprint for easier equipment pad integration
• Ideal for residential in-ground pools and attached spas