Hayward W3HS400FDP is a Universal H-Series liquid propane heater designed for pool and spa heating applications. This 400,000 BTU model features OmniX connectivity for app-based control, scheduling, diagnostics, and remote access when used with a compatible gateway. It is built with a standard cupronickel heat exchanger and is suited for installations requiring dependable propane-fired pool and spa heating.

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Key Features

• Hayward W3HS400FDP is a Universal H-Series liquid propane heater designed for pool and spa heating applications with built-in OmniX functionality.
• This model is rated at 400,000 BTU for dependable heating performance in compatible pool and spa systems.
• The heater uses a standard cupronickel heat exchanger for improved durability in demanding water conditions.
• OmniX capability supports mobile app control, scheduling, diagnostics, and remote connectivity when paired with a compatible Hayward OmniX Gateway.
• Universal Display controls provide an integrated interface for standalone operation and compatible remote control configurations.
• This heater uses forced-draft combustion with hot surface ignition to support consistent heater operation in properly installed systems.
• The unit is designed for 120 or 240 VAC electrical service on applicable 400K models, offering flexible installation options where permitted by code.
• Integrated operation modes support standalone control, OmniX app control, 2-wire or 3-wire remote control, and Hayward Omni automation connection.

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Product Overview

The Hayward W3HS400FDP Universal H-Series Liquid Propane Heater with OmniX is built for pool and spa owners who want dependable propane heat with modern control capability. Rated at 400,000 BTU, this model combines a high-capacity heater platform with Hayward’s Universal Display and OmniX connectivity, allowing the heater to be configured and operated through onboard controls or through the OmniX mobile app. That makes it a practical option for installations where users want better programmability, more convenient control access, and improved diagnostic visibility.

This heater is also designed around long-term durability and installation flexibility. The standard cupronickel heat exchanger helps improve resistance to corrosion-related wear, and the unit supports multiple control methods including standalone operation, remote thermostat control, and Hayward Omni automation integration. For pool and spa applications where reliable heating performance, liquid propane compatibility, and connected control are key priorities, this model offers a strong and serviceable equipment solution.

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Frequently Asked Questions (FAQ)

Q: What is the Hayward W3HS400FDP Universal H-Series heater used for?
A: The Hayward W3HS400FDP is a 400,000 BTU liquid propane pool and spa heater designed for fast, reliable heating in residential pool and spa systems.

Q: Is the Hayward W3HS400FDP propane or natural gas?
A: This model is designed for liquid propane. Natural gas versions are available under different model numbers.

Q: What size pool is the Hayward W3HS400FDP best for?
A: This 400K BTU heater is best for large pools, attached spas, and pool/spa combinations that need fast heat-up and consistent temperature control.

Q: Is the Hayward W3HS400FDP worth it?
A: Yes. It is a strong option for pool owners who need high-output propane heating, cupronickel durability, and OmniX smart control capability.

Q: What is OmniX on the Hayward W3HS400FDP?
A: OmniX is Hayward’s connected control platform that supports app-based control, scheduling, diagnostics, and remote access when paired with a compatible OmniX Gateway.

Q: Can I control the Hayward W3HS400FDP from my phone?
A: Yes. When connected with a compatible Hayward OmniX Gateway, this heater can be monitored and controlled through the OmniX mobile app.

Q: Is the Hayward W3HS400FDP suitable for saltwater pools?
A: Yes. The cupronickel heat exchanger provides improved resistance to corrosion, making it suitable for saltwater and chemically treated pool systems when water chemistry is properly maintained.

Q: Can the Hayward W3HS400FDP replace my existing propane pool heater?
A: Yes. It can replace many existing propane heaters, but compatibility depends on gas supply, plumbing layout, electrical setup, venting, and local code requirements.

Q: Does the Hayward W3HS400FDP require professional installation?
A: Yes. Professional installation is recommended due to propane gas sizing, electrical wiring, plumbing integration, venting, and safety requirements.

Q: When should I choose the Hayward W3HS400FDP instead of a smaller heater?
A: Choose this 400K BTU model if you have a large pool, attached spa, or need faster heat-up compared to lower BTU propane heaters.