Hayward Universal H Series Heaters (Liquid Propane)
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Maximize your swim season with the Hayward Universal H-Series Liquid Propane (LP) Pool Heater. Engineered for reliability and high-efficiency performance, these heaters are the perfect solution for homes without a natural gas line.
Featuring a standard Cupro Nickel heat exchanger, the H-Series is built to handle the toughest pool environments, including saltwater systems and high-flow applications.1 Its low-NOx design ensures you are meeting environmental standards while enjoying a warm, comfortable pool or spa.
Key Benefits of Propane H-Series
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Corrosion Resistance: The Cupro Nickel heat exchanger comes standard, providing superior protection against chemical imbalances.2
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Fast Heating: Advanced hydraulic design moves water faster, meaning less time waiting for the pool to heat up.3
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Flexible Installation: Features dual-voltage (110V/220V) electrical hookups and universal junction boxes on both sides.4
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Precision Control: Easy-to-read LED digital display for temperature settings and self-diagnostics.5
Propane Model Comparison
The model numbers for Liquid Propane units end in "P"
| Feature | 150k BTU | 250k BTU | 400k BTU |
| Model Number | W3H150FDP | W3H250FDP | W3H400FDP |
| Max Pool Surface Area | 450 sq. ft. | 750 sq. ft. | 1,200 sq. ft. |
| Approx. Fuel Usage | 1.6 gal / hr | 2.7 gal / hr | 4.4 gal / hr |
| Unit Width | 21" | 28" | 36" |
| Weight | ~110 lbs | ~134 lbs | ~160 lbs |
| Voltage | 110V / 220V | 110V / 220V | 110V / 220V |
Propane Sizing & Performance Guide
Propane heaters are highly effective for rapid heating, especially for spas. Use the chart below to estimate your Heat-Up Time based on your pool's surface area.
| Pool Surface Area | 150k BTU | 250k BTU | 400k BTU |
| 300 sq. ft. | 1.25°F rise / hr | 2.0°F rise / hr | 3.2°F rise / hr |
| 500 sq. ft. | 0.75°F rise / hr | 1.2°F rise / hr | 2.0°F rise / hr |
| 800 sq. ft. | Not Recommended | 0.75°F rise / hr | 1.25°F rise / hr |
| 1,000+ sq. ft. | Not Recommended | Not Recommended | 1.0°F rise / hr |
Pro Tip: If you are heating a spa, the 400k BTU model is our top recommendation. It can heat a standard 500-gallon spa by 30°F in roughly 18–20 minutes, compared to nearly an hour for the 150k model.
Installation & Warranty Information
Propane Specific Installation
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Gas Pressure: Propane requires a specific manifold pressure (typically 10" W.C.). Ensure your propane provider installs the correct two-stage regulator system to maintain consistent flow.
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Indoor Use: If installing in a shed or indoor equipment room, you must use a Hayward-approved indoor vent kit (sold separately).
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Professional Required: To maintain safety and the manufacturer's warranty, a licensed gas professional must perform the connection and initial fire-up.
Warranty Coverage
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Standard Warranty: 1-Year Limited Warranty on parts and labor.
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Expert Line: Select models installed by a certified pool professional may qualify for an extended 3-Year Parts-Only warranty.
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Important: Failure to have the unit installed by a licensed technician may void the labor portion of the warranty. Always keep your installation receipt and register your heater with Hayward within 60 days.