Product Overview

The Hayward Universal H-Series In-Ground Natural Gas Heater with OmniX 250K | HS250FDN delivers fast, dependable pool and spa heating with modern smart-control technology and durable Hayward construction.

Rated at 250,000 BTU, the HS250FDN is an excellent choice for residential in-ground swimming pools, spas, and pool/spa combinations requiring powerful natural gas heating without stepping up to a larger 400K BTU heater.

At the center of the HS250FDN is Hayward's Universal Display with OmniX embedded intelligence, providing enhanced programmability, advanced diagnostics, and remote-connectivity capabilities. The Universal Display is designed to deliver a consistent control experience across supported Hayward Omni, OmniX, and compatible automation systems.

A durable cupro-nickel heat exchanger provides increased resistance to corrosion and premature wear, while Hayward's totally managed water-flow design helps deliver strong hydraulic performance. Low NOx combustion helps meet applicable clean-air requirements.

Key Features

250,000 BTU natural gas pool and spa heater

Built-in OmniX embedded intelligence

Hayward Universal Display

Advanced heater diagnostics

Enhanced programming capabilities

Remote-connectivity capability

Durable cupro-nickel heat exchanger

84% thermal efficiency

Low NOx emissions

Forced-draft combustion

Silicon nitride hot-surface ignition

Totally managed water-flow system

Front-panel-only service access

Universal electrical junction box

Left- or right-side electrical installation

Designed for in-ground pools and spas

Excellent for new construction or replacement applications

OmniX Smart Control

The HS250FDN incorporates OmniX intelligence directly into the heater, giving homeowners and service professionals improved access to programming and diagnostic information.

When properly connected to compatible Hayward automation and networking equipment, OmniX provides enhanced equipment communication and remote-control capabilities.

This modern control platform makes the HS250FDN particularly attractive for new pool installations and customers replacing an older Universal H-Series heater.

Cupro-Nickel Heat Exchanger

Hayward equips the HS250FDN with a cupro-nickel heat exchanger designed to provide improved resistance against corrosion and premature wear.

Cupro-nickel construction is especially beneficial in demanding pool environments, but proper water chemistry remains essential for maximizing heater life and performance.

Specifications

Hayward's technical documentation specifies 250,000 BTU input, 25 GPM minimum flow, 125 GPM maximum flow, and 84% thermal efficiency for the 250 model.

Warranty & Compatibility

Easy Replacement Design

The Universal H-Series platform is engineered with replacement installations in mind. Hayward states that these heaters provide direct compatibility with Hayward plumbing adapters, helping simplify replacement of many existing Universal H-Series installations.

Existing plumbing, gas supply, electrical service, clearances, and venting requirements should always be verified before installation.

Customer-Facing Q&A

Q: Is the HS250FDN natural gas or propane?
A: The HS250FDN is a natural gas heater. Customers requiring propane should select the corresponding propane configuration.

Q: How many BTUs is the HS250FDN?
A: The heater is rated at 250,000 BTU/hr.

Q: Does the HS250FDN have OmniX?
A: Yes. It features OmniX embedded intelligence along with Hayward's Universal Display.

Q: Does this heater have a cupro-nickel heat exchanger?
A: Yes. A cupro-nickel heat exchanger is standard on this model.

Q: What flow rate does the heater require?
A: Hayward specifies a minimum flow of approximately 25 GPM and a maximum flow of 125 GPM.

Q: What is the thermal efficiency?
A: The HS250FDN is rated at approximately 84% thermal efficiency.

Q: What size is the heater?
A: The unit measures approximately 25" wide x 29.5" deep x 24" high.

Q: Is this a Low NOx heater?
A: Yes. The Universal H-Series incorporates Low NOx combustion technology designed to meet applicable clean-air standards.

Q: Can this replace an older Hayward Universal H-Series heater?
A: It is designed to simplify replacement of existing Universal H-Series installations, but the existing plumbing, gas supply, electrical connections, venting, and installation clearances must be confirmed before installation.

Q: Is professional installation recommended?
A: Yes. Gas pool heaters should be installed by a qualified pool-heater or gas professional. Correct gas-line sizing, ventilation, electrical connections, water flow, and local code compliance are essential for safe and reliable operation.