Hayward W3H400FDP Universal H-Series Propane Pool and Spa Heater: 400,000 BTU heating capacity
Ever wished your pool or spa could heat up faster than you can say 'brrr'? Meet the Hayward Universal H-Series 400,000 BTU Propane Heater. It's not just any heater—it's your ticket to instant warmth, thanks to its cupro nickel heat exchanger that laughs in the face of harsh conditions. Morning swims? Spa nights? The H-Series has your back, delivering heat so reliable, you'll forget winter ever existed.
Here's why it's a game-changer: First off, it heats your water in a flash (because who likes waiting?). Then there's the energy-smart design that keeps your bills as low as your pool's temperature used to be. And let's not forget, it's kind to the planet too, meeting all those low-NOx standards without breaking a sweat.
Simple to use, easier to love—this heater is the no-brainer choice for anyone who values their comfort (and their wallet).
- Durable cupro nickel heat exchanger
- Low NOx emissions
- Industry-leading hydraulic performance
- Easy front-panel access
- 400,000 BTU heating capacity
General specs
- Brand: Hayward
- Model: W3H400FDP
- Seller: Amazon
- product_dimensions: 39.6 x 32.8 x 30.6 inches
- item_weight: 214 pounds
- heating_capacity: 400,000 BTU
- heat_exchanger_material: Cupro nickel
- First listed by seller: 5/10/25
If you are interested in more details, you can find full information on the seller's page.
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Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Hayward W3H400FDP 400,000 BTU heating capacity
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Hayward W3H400FDN
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Hayward W3H200FDN Premium heating performance
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Hayward W3H250FDN
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Hayward W3HP21404T Maintains ideal water temperature
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Raypak P-R406A-EN-X Cupro-nickel gas pool and spa heater
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| Brand | Hayward | Hayward | Hayward | Hayward | Hayward | Raypak |
| Model | W3H400FDP | W3H400FDN | W3H200FDN | W3H250FDN | W3HP21404T | P-R406A-EN-X |
| Color | ||||||
| Rating |
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| Price | $4,199.00 | $4,016.20 | $2,999.00 | $3,299.00 | $5,699.00 | $3,899.00 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | June 29, 2025 | June 29, 2025 | June 27, 2025 | June 25, 2025 | June 27, 2025 | June 27, 2025 |
| product_dimensions | 39.6 x 32.8 x 30.6 inches | 39.6 x 32.8 x 30.6 inches | 33.3 x 32.8 x 30.6 inches | 33.3 x 32.8 x 30.6 inches | 40 x 31.5 x 50 inches | 44 x 34 x 31 inches |
| item_weight | 214 pounds | 195 pounds | 161 pounds | 165 pounds | 320 pounds | 0.01 ounces |
Universal H-Series Propane Pool and Spa Heater
Mathieu G.
Toulouse
May 21, 2025
First impression: This thing is a beast. I hooked it up to my pool a couple weeks ago, and wow, the water warms up in no time. No more shivering before a swim. The materials seem top-notch, resisting corrosion like a champ. I appreciate how it doesn't guzzle energy; my wallet isn't screaming. But yeah, there's a hum when it's on, not too loud but noticeable. Setup took a bit of DIY spirit, but once going, it's smooth. For the price, I expected perfection, but it delivers well. Could be a game-changer for family gatherings, though I'm solo. Overall, solid buy, just keep expectations in check :)
- Pros: Heats the pool super fast, which is great for spontaneous dips. The build feels solid and handles tough weather without issues. Energy use is low, so my bills haven't spiked. It's easy to set up and use, very intuitive.
- Cons: Could be wrong, but it might not be the quietest when running. The initial cost is high, and propane adds ongoing expense. Installation required some effort, not plug-and-play.