Universal H Series Low NOx Natural Gas Water Heater

Product Codes: W3H150FDN (150k BTU), W3H200FDN (200k BTU), W3H250FDN (250k BTU), W3H400FDN (400k BTU)

Product Name: Hayward Universal H‑Series Low NOx Natural Gas Pool Heater

Maximum Altitude: Up to 10,000 ft (higher elevations require FDXLHAK1930)

BTU Options: 150k — 200k — 250k — 400k

Heater Type: Natural Gas

Heat Exchanger: Cupro‑Nickel (enhanced corrosion resistance; salt‑compatible)

Corrosion Resistance: Excellent

Connection: 2 in. Male Threaded

Venting: Vertical or Horizontal

Voltage: 120/240V

Heater Dimensions: 150k/200k/250k — 33 × 33 × 30 in; 400k — 33 × 39 × 30 in

Warranty: 1‑Year Parts

The Hayward Universal H‑Series Low NOx heater is an efficient, environmentally‑friendly heating solution for pools and spas. With industry‑leading 83–84% efficiency and low NOx emissions, it complies with strict environmental air‑quality standards. Its cupro‑nickel Finn Plate heat exchanger delivers superior durability and heat transfer, making it ideal for saltwater and harsh water environments. Stainless steel burners, insulated FireTile combustion chamber, and high‑performance hydraulics reduce circulation time and energy consumption. A digital LED control panel monitors system performance for convenience and reliability. The forced‑draft combustion system ensures consistent heating performance by eliminating external weather variables such as wind. Universal‑fit design makes installation easier on most existing pads.

Features:

• Low‑NOx, environmentally friendly emissions
• 83–84% thermal efficiency
• Cupro‑nickel heat exchanger for superior corrosion protection
• Stainless steel burners
• FireTile combustion chamber for optimum heat retention
• Digital LED control panel
• Forced‑draft system eliminates external weather influence
• Universal‑fit design for easy installation
• Reduces pump circulation time for energy savings
• Consistent, fast heating — can raise an 800‑gal pool by 30°F in under 1 hour

WARNING: Not compatible with soft‑sided pools (Intex, Coleman, Bestway). Installing on a soft‑sided pool voids all warranty.

Warranty Coverage: At the manufacturer’s discretion. Limited 1‑year parts warranty applies only when installed by a licensed technician. Warranty void if damaged due to improper installation, improper water chemistry, or use on non‑compatible pools. Labour, chemical loss, and incidental damages not covered.

https://www.youtube.com/embed/vXTZ7vUGEws