Product Overview

The Hayward Universal H-Series Natural Gas Heater W3H150FDN is a 150,000 BTU pool and spa heater designed to deliver reliable, efficient heating for residential in-ground pool and spa applications. Built on Hayward’s Universal H-Series platform, this heater combines dependable natural gas performance with installation flexibility, corrosion-resistant construction, and easy-to-use digital controls.

Featuring a cupro nickel heat exchanger, Low NOx emissions design, and a forced-draft combustion system, the W3H150FDN is built to provide fast, consistent heating while helping protect against corrosion caused by challenging water conditions.

Reliable Heating for Pools and Spas

The Universal H-Series 150K BTU heater is designed to help raise and maintain comfortable pool or spa water temperatures. Whether used to extend the swimming season, warm water on cooler days, or provide quick heat for a spa, this heater delivers dependable on-demand performance when properly sized and professionally installed.

Its 150,000 BTU heating capacity makes it a practical option for smaller to mid-size residential in-ground pools and compatible spa applications.

Universal Installation Flexibility

The Hayward Universal H-Series is designed with installation adaptability in mind. Its compact, low-profile cabinet and flexible connection options help simplify both new installations and replacement projects.

This heater is well suited for equipment pads where space, plumbing orientation, and service access are important considerations.

Ideal For

Residential in-ground pools

Attached spas and pool/spa combinations

Smaller to mid-size pool heating applications

Homes supplied with natural gas

Saltwater pools with properly balanced water chemistry

Replacing an older natural gas pool heater

Pool owners wanting faster heating than solar alone

New equipment pad installations

Installations requiring 120/240 V compatibility

Key Features

Genuine Hayward Universal H-Series natural gas heater

150,000 BTU heating capacity

Natural gas fuel configuration

120/240 V electrical compatibility

60 Hz, single-phase operation

Designed for residential in-ground pools and spas

Low NOx emissions design

Cupro nickel heat exchanger for enhanced corrosion resistance

Forced-draft combustion system for consistent heating performance

Digital LED control panel for simple operation

Electronic ignition system

Universal-style design for flexible installation

Compact, low-profile cabinet

Designed for left-side or right-side water, gas, and electrical connections

Compatible with saltwater pools when properly maintained

Built for new installations and heater replacement applications

Benefits

Fast, Dependable Heating: The 150K BTU output helps warm pool or spa water efficiently, allowing customers to enjoy more comfortable swimming conditions.

Natural Gas Performance: Natural gas provides strong, consistent heat output for pool and spa applications, making this heater a dependable choice for homes with natural gas service.

Corrosion-Resistant Construction: The cupro nickel heat exchanger helps resist corrosion and premature failure caused by unbalanced water chemistry, saltwater systems, and demanding pool environments.

Cleaner Low NOx Operation: The Low NOx design helps reduce emissions and supports compliance in many areas with stricter clean-air requirements.

Easy Temperature Control: The digital LED control panel makes it simple to adjust and monitor heater operation.

Flexible Replacement Option: The Universal H-Series design helps make the W3H150FDN a strong replacement choice for many existing pool heater installations.

Specifications

What’s Included

• One Hayward Universal H-Series Natural Gas Heater, 150K BTU
• Digital control system
• Cupro nickel heat exchanger
• Electronic ignition system
• Factory-installed heater components
• Manufacturer documentation, where supplied by packaging

Gas line components, venting materials, electrical whip, plumbing fittings, equipment pad materials, and installation labor are not included unless specified separately.

Warranty & Compatibility

The Hayward W3H150FDN is designed for natural gas pool and spa heating applications. It is commonly used for residential in-ground pools and spas when properly sized for the pool volume, desired temperature rise, and local climate conditions.

Before ordering, confirm:

• Fuel type: Natural gas
• Heating capacity: 150,000 BTU
• Electrical requirements: 120/240 V, 60 Hz, single phase
• Gas line sizing and supply requirements
• Pool size and desired heat-up time
• Plumbing flow rate requirements
• Ventilation and installation clearance requirements
• Local gas, plumbing, electrical, and building codes
• Professional installation requirements

This heater should not be used with propane unless the heater model is specifically configured for propane gas.

Customer-Facing Q&A

Q: What type of fuel does the Hayward W3H150FDN use?
A: The W3H150FDN uses natural gas.

Q: How many BTUs is this heater?
A: This heater is rated at 150,000 BTU.

Q: What voltage does this heater require?
A: The W3H150FDN is designed for 120/240 V, 60 Hz, single-phase electrical operation.

Q: Is this heater for pools or spas?
A: This heater is designed for residential in-ground pools and spas when properly sized and installed.

Q: Does this heater have a cupro nickel heat exchanger?
A: Yes. The W3H150FDN features a cupro nickel heat exchanger for enhanced corrosion resistance.

Q: Is this heater compatible with saltwater pools?
A: Yes. It can be used with saltwater pools when the pool water is properly balanced and maintained.

Q: Is this a propane heater?
A: No. This model is configured for natural gas. Do not use it with propane unless the heater model specifically supports propane.

Q: Does this heater require professional installation?
A: Yes. Gas pool heaters should be installed by qualified professionals according to local gas, electrical, plumbing, and building codes.

Q: What is the barcode for this product?
A: The UPC / Barcode is 0610377406840.