Hayward Universal H Series Heaters (Natural Gas)
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Enhance your backyard experience with the Hayward Universal H-Series Natural Gas Pool Heater, the industry standard for energy efficiency, reliability, and performance.1 Designed to extend your swimming season, this low-NOx heater combines advanced hydraulic technology with a durable Cupro Nickel heat exchanger to deliver faster heating and longer-lasting protection against salt and chemical corrosion.
Whether you are heating a small backyard spa or a massive inground pol, the H-Series offers a "universal" fit that is easy to install and even easier to operate.
Key Features
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Standard Cupro Nickel Heat Exchanger: Built to withstand the harshest pool chemistry, including saltwater systems.3
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Energy Efficient: The patented hydraulic design reduces pump run-time, potentially saving you up to 18% in energy costs.4
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Low NOx Emissions: Eco-friendly design meets strict air quality standards in all states, including California and Texas.5
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Dual Voltage: Simple installation with a system that adapts to both 110V and 220V power.
H-Series Model Comparison
Choosing the right size depends on your pool's surface area and how quickly you want to reach your target temperature.
| Feature | 150k BTU | 250k BTU | 400k BTU |
| Model Number | W3H150FDN | H250FDN | H400FDN |
| Max Pool Surface Area | 450 sq. ft. | 750 sq. ft. | 1,200 sq. ft. |
| Pool Capacity (Approx) | Up to 15,000 Gallons | Up to 25,000 Gallons | Up to 40,000 Gallons |
| Unit Width | 21" | 28" | 36" |
| Weight | ~110 lbs | ~134 lbs | ~160 lbs |
| Plumbing Conn. | 2" x 2-1/2" CPVC | 2" x 2-1/2" CPVC | 2" x 2-1/2" CPVC |
Installation & Warranty
Professional Installation
To ensure safety and optimal performance, Hayward strongly recommends that H-Series heaters be installed by a licensed professional. Proper gas line sizing, venting, and electrical bonding are critical for safe operation.
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Indoor Venting: If installing indoors, a specific Hayward indoor vent kit is required.7
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Saltwater Ready: No additional parts are needed for saltwater pools thanks to the standard Cupro Nickel heat exchanger.
Warranty Information
The Hayward H-Series typically comes with a 1-Year Limited Warranty on parts and labor when installed by a professional.
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Parts Protection: Some retailers and "Expert Line" models may offer an extended 3-year parts warranty.
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DIY Note: Please be aware that warranty coverage may be limited to parts-only (excluding labor) if the unit is not installed by a qualified technician.9 Always register your product within 60 days of purchase to ensure full coverage.