The Hayward Universal H-Series Low NOx 150,000 BTU Natural Gas Pool Heater delivers dependable, high-efficiency heating for pools and spas in a wide range of climates and elevations. Designed for modern energy standards and demanding installations, this heater combines clean combustion, durable materials, and flexible venting in a compact footprint.

Part Number Update:
The model W3H150FDN replaces H150FDN. The change reflects online cataloging only—both part numbers refer to the same heater, and inventory may ship under either designation.

Powerful Heating with Environmental Compliance

With an 83–84% thermal efficiency rating, the Universal H-Series Low NOx heater meets strict air-quality regulations while delivering fast, consistent heat. Its low NOx combustion design complies with current California and Texas emissions standards, making it a strong choice for environmentally conscious pool owners without sacrificing performance.

At 150,000 BTUs, this unit provides rapid temperature recovery and reliable heating for medium to large residential pools and spas.

Built for Altitude, Saltwater & Longevity

• Rated for elevations up to 10,000 ft (3,048 m) without modification

• Cupro-Nickel heat exchanger offers superior corrosion resistance compared to copper, ideal for saltwater and challenging water conditions

• Stainless steel burners promote clean, stable combustion

• Insulated Fire Tile combustion chamber captures heat efficiently while keeping cabinet temperatures controlled

For installations above 10,000 ft, the high-altitude kit SKU: FDXLHAK1930 is required.

Stable Performance in Any Weather

A forced-draft combustion system actively manages airflow, eliminating performance loss from wind or outdoor conditions. This design removes the need for high-wind vent stacks while maintaining steady heat output throughout the season.

Installer-Friendly & Equipment-Pad Compatible

• 2" male threaded water connections

• Vertical or horizontal venting options

• 120V / 240V compatible

• Compact footprint fits most new or existing equipment pads

The universal-fit layout reduces installation time and simplifies replacement of older heaters.

Key Specifications

• BTU Output: 150,000 BTU

• Fuel Type: Natural Gas

• Heat Exchanger: Cupro-Nickel

• Max Altitude: 10,000 ft

• Dimensions: 33" × 33" × 30"

• Shipping Dimensions: 33" × 33" × 26"

• Warranty: 1-Year Parts

Important Compatibility & Warranty Notices

Soft-Sided Pool Restriction
This heater is NOT compatible with soft-sided pools, including Intex®, Coleman®, or Bestway®. These pools do not provide adequate water flow.
Installing this heater on a soft-sided pool will void the manufacturer’s warranty.

Professional Installation Required
Warranty coverage requires installation by a licensed technician. Damage caused by improper water chemistry, incorrect installation, or incompatible pool types is not covered.

Warranty Coverage

• Term: 1 year from purchase date

• Coverage: Replacement parts only (manufacturer’s discretion)

• Conditions:

  • Installed with a pool or spa

  • Installed by a licensed professional

  • Proper water chemistry maintained

Refer to the product manual for complete warranty terms.