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HAYWARD UNIVERSAL H-SERIES HS400FDN LOW NOX OMNIX NATURAL GAS POOL & SPA HEATER – 400K BTU, CUPRO-NICKEL HEAT EXCHANGER
Dimensions: 24" H x 34" W x 29.5" D
Heating Capacity: 400,000 BTU
Thermal Efficiency: Approx. 82%
Fuel Type: Natural Gas
Heat Exchanger: Cupro-Nickel
Water Flow Rate: 30-125 GPM
Controls: OmniX Smart Automation
Emissions: Low NOx
The Hayward HS400FDN Universal H-Series Natural Gas Pool & Spa Heater with OmniX delivers 400,000 BTU - the high-output size in the residential Universal H-Series range - with embedded smart automation built in.
OmniX puts the intelligence in the heater itself rather than in a separate control panel. You get app-based remote temperature control, scheduling, wireless coordination with pumps and other equipment, and advanced diagnostics out of the box. An optional OmniX Gateway extends control beyond Bluetooth range.
The hardware underneath is the proven Universal H-Series platform: a cupro-nickel heat exchanger for salt water and chemical corrosion resistance, a forced-draft combustion system that eliminates the need for a high-wind stack, and Low NOx emissions. At 400,000 BTU it heats large pools and spa combinations quickly, accepting 30 to 125 GPM.
Key Features
- 400,000 BTU heating capacity
- Approximately 82% thermal efficiency
- Natural Gas
- OmniX embedded smart automation
- App-based remote temperature control and scheduling
- Wireless coordination with pumps and other equipment
- Advanced onboard diagnostics
- Universal Display for consistent controls across automation systems
- Optional OmniX Gateway for control from anywhere
- Cupro-nickel heat exchanger
- Forced-draft combustion system
- Low NOx emissions
- 30-125 GPM water flow rate
- Drop-in replacement with Hayward plumbing adapters
Specifications
| Specification | Details |
| Brand | Hayward |
| Part Number | HS400FDN |
| Series | Universal H-Series with OmniX |
| Fuel Type | Natural Gas |
| BTU Input | 400,000 BTU |
| Thermal Efficiency | Approx. 82% |
| Heat Exchanger | Cupro-Nickel |
| Water Flow Rate | 30-125 GPM |
| Dimensions | 24" H x 34" W x 29.5" D |
| Voltage | 120/240V |
| Phase | Single Phase |
| Frequency | 60 Hz |
| Circuit Amps | 5.5 A |
| Maximum Breaker Size | 15 A |
| Controls | OmniX Smart Automation |
| Emissions | Low NOx |
| Clearances | 12" Sides / 6" Rear |
| Pool Type | In-Ground |
| Warranty | 3-Year Parts / 1-Year Labor |
What's Included
- Hayward HS400FDN Universal H-Series Natural Gas Pool & Spa Heater with OmniX
- Cupro-nickel heat exchanger assembly
- OmniX control system with Universal Display
- Installation and operation documentation
The Hayward HS400FDN combines 400,000 BTU of natural gas heating with a cupro-nickel exchanger and OmniX embedded automation - fast heat-up for large pools with app control built in.
Learn more at Hayward:
https://www.hayward.com/universal-h-series-heater-200-000-btu-natural-gas-w-omnix-hs200fdn.html
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