Hayward | W3H135FDN | 135K BTU Natural Gas Pool Heater – Compact, Energy-Efficient Design

• In_Ground_Pool_Spa_Gas_Heater_Owners_Manual.pdf
• 2025_Hayward_Heat_Chill_Leave_Behind_TRIM_96_669d0196-044a-4506-a27c-84002b5df6b5.pdf
• CuproNickelSellSheet.pdf
• Hayward_Universal_H_Serise_Quick_Reference_Guide.pdf
• Indoor_Vent_Kit_Instructions_2021_442aa971-616d-47e5-a0ab-fc8840e9b6fe.pdf
• Universal_HSeries_Brochure_Bilingual.pdf
• Energy_Guide.pdf
• heating_Universal_H_Series_Low_Nox_front.pdf
• Universal_H_Serise_Low_NOx_Line_Drawing_Front.pdf

The Hayward W3H135FDN H-Series 135,000 BTU Natural Gas Pool Heater is a compact and efficient heating solution designed for small in-ground and above-ground pools and spas. Engineered for durability, efficiency, and ease of use, it provides reliable heating performance while operating on standard 120/240V single-phase power.

Key Features

• 135,000 BTU heating capacity for small pools and spas

• Operates on 120/240V, 60 Hz, single-phase power

• Energy-efficient design for lower operating costs

• Cupro-nickel heat exchanger for corrosion resistance and long service life

• Rapid heating capability for quick temperature recovery

• Easy-to-use digital control panel for precise temperature settings

• Polymer header and bypass valve for improved hydraulic performance

• Compact footprint for easy installation in tight spaces

• Suitable for in-ground and above-ground pool applications

• Quiet operation for a more enjoyable backyard environment

Product Overview

The Hayward W3H135FDN H-Series Natural Gas Pool Heater offers dependable heating in a compact package, making it ideal for smaller pools and spas. With a 135,000 BTU output, it quickly and efficiently heats water to the desired temperature while maintaining low operating costs. Its cupro-nickel heat exchanger provides excellent resistance to corrosion, ensuring long-lasting performance even in challenging water conditions. Designed for straightforward installation, it operates on standard 120/240V single-phase power and features a digital LED control panel for ease of use. The compact design and quiet operation make the W3H135FDN a perfect choice for pool owners seeking a balance of performance, efficiency, and space-saving convenience.