• Hayward Universal H-Series Pool Heater H400FDN
  • Hayward Universal H-Series Pool Heater H400FDN
  • Hayward Universal H-Series Pool Heater H400FDN

Hayward Universal H-Series Pool Heater H400FDN

Hayward Universal H-Series Pool Heater H400FDN

$1,499.00
$1,499.00 $2,999.00
SAVE 50% Sold out

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Hayward Universal H-Series Pool Heater H400FDN

Hayward Universal H-Series Pool Heater H400FDN

$1,499.00
$1,499.00 $2,999.00
SAVE 50% Sold out

🔥 Core Specs

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  • Model: H400FDN (also W3H400FDN newer number)
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  • Heating Capacity: 400,000 BTU/hr
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  • Fuel Type: Natural Gas
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  • Ignition: Electronic (IID – no pilot light)
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  • Emissions: Low NOx (environmentally compliant)
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🏊 What size pool it’s for

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  • Ideal for:\n
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    • 20,000 to 40,000+ gallon pools
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    • Large spas + pool combo setups
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  • Very fast recovery heater:\n
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    • Can raise temp roughly 1–2°F per hour depending on conditions
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⚙️ Key Features

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🔩 Heat exchanger (big advantage)

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  • Cupro-nickel heat exchanger
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  • Excellent for:\n
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    • Saltwater pools
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    • Hard water conditions
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    • Long-term corrosion resistance
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🌊 Hydraulic efficiency design

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  • “Totally Managed Flow” system
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  • Reduces pump runtime (up to ~18% savings claimed)
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  • Improves heating efficiency by balancing water flow through tubes
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⚡ Controls & electronics

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  • Digital LED control panel
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  • Self-diagnostics (error codes like IF, LO, HS)
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  • Compatible with pool automation systems
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🌬️ Combustion system

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  • Forced-draft design (blower-assisted)
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  • Stable heating even in windy conditions
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Is this tool covered by a warranty?

Yes — every tool comes with a manufacturer warranty covering defects in materials and workmanship. Check the product description for the exact warranty period on this item.

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How fast will my order ship?

Orders are processed within 1–2 business days and typically arrive within 5–7 business days across the US. You'll get a tracking number as soon as it ships.

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Can I return it if it's not what I expected?

Absolutely. We offer a 30-day return policy on unused, like-new items in original packaging. Just reach out to our support team and we'll walk you through it.

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Is this safe/rated for professional use?

Yes, this tool meets standard safety and performance certifications for both DIY and professional job sites. Always follow the included manual for best results.

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What if my tool arrives damaged or defective?

Reach out within 48 hours of delivery with a photo of the issue, and we'll send a replacement or issue a refund — no hassle.

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