Hayward W3H400FDN Universal H-Series Natural Gas Pool and Spa Heater: Premium heating performance for years of reliable comfort
Meet the Universal H-Series 400,000 BTU Natural Gas Pool & Spa Heater from Hayward—your pool's new best friend. Perfect for in-ground pools and spas, this beast doesn't just heat; it delivers warmth like a sunbeam on a chilly morning, covering up to 1,200 ft. And thanks to its tough-as-nails cupro nickel heat exchanger, it laughs in the face of corrosion and unbalanced water chemistry (because who has time for that?).
Here's the scoop on what makes it stand out: You'll save a bundle on energy thanks to its top-tier hydraulic performance. It heats up faster than you can say "cannonball"—seriously, it's quick. Plus, it's kind to the planet with low NOx emissions that meet all air quality standards. And let's not forget the cherry on top: operating and maintaining it is a breeze, with everything you need right on the front panel and an intuitive control pad that won't require a manual the size of a novel.
So, if you're after a heater that's efficient, eco-friendly, and ready to keep your pool or spa at the perfect temp season after season, look no further. 🌿🔥 (Your toes will thank you.)
- Durable cupro nickel heat exchanger for corrosion protection
- Industry-leading hydraulic design for energy savings
- Easy operation with front-panel-only access and intuitive control pad
- Low NOx emissions meet all air quality standards
- Premium heating performance for years of reliable comfort
General specs
- Brand: Hayward
- Model: W3H400FDN
- Seller: Amazon
- product_dimensions: 39.6 x 32.8 x 30.6 inches
- item_weight: 195 pounds
- manufacturer: Hayward
- item_model_number: W3H400FDN
- First listed by seller: 4/12/25
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 W3H400FDN
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Hayward W3H200FDN Premium heating performance
|
Hayward W3H400FDP 400,000 BTU heating capacity
|
Hayward W3H250FDN
|
Raypak P-R406A-EN-X Cupro-nickel gas pool and spa heater
|
Hayward W3HP21404T Maintains ideal water temperature
|
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| Brand | Hayward | Hayward | Hayward | Hayward | Raypak | Hayward |
| Model | W3H400FDN | W3H200FDN | W3H400FDP | W3H250FDN | P-R406A-EN-X | W3HP21404T |
| Color | ||||||
| Rating |
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| Price | $4,016.20 | $2,999.00 | $4,199.00 | $3,299.00 | $3,899.00 | $5,699.00 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | June 29, 2025 | June 27, 2025 | June 29, 2025 | June 25, 2025 | June 27, 2025 | June 27, 2025 |
| product_dimensions | 39.6 x 32.8 x 30.6 inches | 33.3 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 | 44 x 34 x 31 inches | 40 x 31.5 x 50 inches |
| item_weight | 195 pounds | 161 pounds | 214 pounds | 165 pounds | 0.01 ounces | 320 pounds |
Universal H-Series Natural Gas Pool and Spa Heater
Lauren H.
Denver, CO
April 21, 2025
My first impression was how robust and well-made this Hayward heater looks—it really stands up to the elements here in Denver. I loved that it heats the water so quickly, making spontaneous dips possible even on cooler days. The controls are straightforward and didn't require me to dig through manuals, which is a relief. It's eco-friendly and meets all regulations, which matters to me. Overall, it's been a game-changer for our pool parties and keeps everyone happy :)
- Pros: This heater is an incredible workhorse that arrived on time and started warming my pool almost instantly, as it seemed to me. It saves a lot on energy bills and handles tough water conditions without any fuss, which is perfect for our family with multiple kids always wanting to swim.