Home » Hayward | HS400FDN | Universal H-Series Natural Gas Heater with OmniX | 400K BTU
Hayward | HS400FDN | Universal H-Series Natural Gas Heater with OmniX | 400K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS400FDN | Universal H-Series Natural Gas Heater with OmniX | 400K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward
Hayward | HS250FDN | Universal H-Series Natural Gas Heater with OmniX | 250K BTU Hayward

Hayward | HS400FDN | Universal H-Series Natural Gas Heater with OmniX | 400K BTU

In stock
SKU: HS400FDN
Length: 39.5 in Width: 32.8 in Height: 30.6 in
$3,700.00

Hayward HS400FDN is a Universal H-Series natural gas pool and spa heater with OmniX designed for high-performance heating, smart connectivity, and easier replacement in compatible pool and spa systems. This model is rated at 400,000 BTU/hr and combines Hayward’s Universal Display with OmniX embedded intelligence for enhanced programmability, advanced diagnostics, and remote connectivity.

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Key Features

• Hayward HS400FDN is a Universal H-Series natural gas heater with OmniX rated at 400,000 BTU/hr.
• The OmniX platform adds enhanced programmability, advanced diagnostics, and seamless remote connectivity.
• Hayward’s Universal Display is designed to provide a consistent and intuitive control experience across Omni, OmniX, and competitive automation systems.
• The heater uses a cupro-nickel heat exchanger for strong protection against corrosion and premature failure caused by unbalanced water chemistry.
• Totally managed water flow is designed to deliver strong hydraulic performance with fast speed-to-heat capability.
• The universal junction box supports either left or right electrical installation for more flexible field setup.
• Front-panel-only access is designed to simplify service and maintenance without requiring front-and-back panel access.
• The heater supports OmniX app control and can also communicate with Hayward Omni automation through a 3-wire smart connection.

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Product Overview

The Hayward HS400FDN Universal H-Series Natural Gas Heater with OmniX is built for pool owners and service professionals who want strong 400K BTU heating performance with a more modern control platform. As part of the updated H-Series OmniX lineup, this model combines Hayward’s proven Universal H-Series heater design with a newer display and control approach that improves usability, diagnostics, and connected control options. It is especially well suited for pool and spa installations where fast heating, easier retrofit potential, and smarter operation are important priorities.

What makes this model especially appealing is the combination of heater performance and control flexibility. The dealer announcement highlights drop-in replacement compatibility, cupro-nickel durability, front-panel service access, and embedded OmniX intelligence, while the owner’s manual shows support for standalone control, OmniX app control, traditional remote control, and Hayward Omni automation integration. For buyers looking for a premium 400,000 BTU natural gas heater with smart control capability, the HS400FDN is a strong and current H-Series option.

Frequently Asked Questions (FAQ)

Q: What is the Hayward HS400FDN Universal H-Series heater used for?
A: The Hayward HS400FDN is a 400,000 BTU natural gas pool and spa heater designed for large residential and commercial pools that require fast, high-performance heating.

Q: What size pool is the Hayward HS400FDN best for?
A: This 400K BTU heater is best for large pools, spas, and pool/spa combinations that need rapid heat-up and consistent temperature control.

Q: Is the Hayward HS400FDN worth it?
A: Yes. It is a premium heater offering powerful heating output, modern OmniX smart control, and durable construction for long-term performance.

Q: What is OmniX on the Hayward HS400FDN?
A: OmniX is Hayward’s embedded smart control platform that provides advanced programming, diagnostics, and remote connectivity through mobile apps and automation systems.

Q: Can I control the Hayward HS400FDN from my phone?
A: Yes. The OmniX system allows remote monitoring, scheduling, and temperature adjustments using Hayward’s connected control interface.

Q: Is the Hayward HS400FDN suitable for saltwater pools?
A: Yes. The cupro-nickel heat exchanger offers strong resistance to corrosion, making it suitable for saltwater and chemically treated pool environments.

Q: Can the Hayward HS400FDN replace my existing pool heater?
A: Yes. It is designed for easier replacement in compatible systems, but installation compatibility depends on gas supply, plumbing layout, electrical setup, venting, and equipment configuration.

Q: Does the Hayward HS400FDN require professional installation?
A: Yes. Professional installation is recommended due to natural gas connections, electrical wiring, plumbing integration, venting, and local code requirements.

Q: Is the Hayward HS400FDN Low NOx compliant?
A: Yes. This heater meets Low NOx emission standards, making it suitable for regulated areas such as California.

Q: What makes the Hayward HS400FDN easier to service?
A: The front-panel-only access design allows technicians to service internal components quickly without removing multiple panels, reducing maintenance time.

Q: When should I choose the Hayward HS400FDN instead of a smaller heater?
A: Choose the HS400FDN if you have a large pool, attached spa, or need maximum heating performance and faster heat-up times compared to lower BTU models.