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Hayward H400FDN Universal H-Series Natural Gas Heater 400k BTU (ASME)

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Price in points: 179300 points
I acknowledge that installation of this product must be performed by a professional technician and electrical products are not refundable; self-installation can void manufacturer's warranty.

Quick Overview

Hayward Commercial Pool's Universal H-Series ASME gas heaters are designed and certified for commercial use. The flagship of our H-Series line encompasses high-end features and construction materials as standard. They combine industry-leading hydraulics, exceptional performance, energy efficiency and reliability, with planet-friendly low-NOx emissions. Flexible connection options make them ideal for new or existing applications. Choose from 250,000, and 400,000, and 500,00 BTU natural gas or propane models.

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Hayward 400K BTU Natural Gas ASME Heater

If you're in the market for a commercial pool heater, you'll want to be sure that you choose a model that is designed to withstand the consistent, tough use that a commercial pool endures. The Hayward H-Series of pool heaters has been designed to provide a heater to suit every pool's needs, from the smallest residential pool to specially-designed and warrantied heaters capable of heating large commercial pools.

Operating a commercial pool isn't easy, and the H-Series 400K BTU commercial pool heater by Hayward has been designed to make heating simple.

Why choose the H-Series 400K BTU commercial pool heater from Hayward?

Hayward has designed this 400K BTU Natural gas commercial pool heater to perform amazingly well in commercial pools that can provide unique challenges to heating. The H-Series sets industry standards in pumping performance, energy efficiency and reliability - all backed by a 3 year warranty on parts and labour.

Commercial pool heaters can have limited equipment space, and challenging set up areas. The H-Series commercial pool heater has been designed for simple installation. This heater can be plumbed to the right or the left, making it a perfect choice for a new pool, or to replace an older heater. The dual-voltage capability also ensures this Hayward H-Series pool heater can work with your existing power supplied.

An easy access panel ensures the H-Series commercial pool heater is also easy to service after years in place. This can save your pool professional time, money, and frustration when they make small repairs or service your heater. The Hayward H-Series commercial pool heater can also be programmed with the ideal settings ot keep your pool perfectly heated, with a special lock-out feature that prevents inexperienced employees or guests from making changes to your settings.

Easy and flexible heating from commercial pools

Commercial pools require specialized design to ensure guests and swimmers are safe, comfortable, and that they enjoy every minute in the pool. A reliable heater ensures that you can depend on your pool heater to function when you need it, extending the summer swimming season by weeks each year. Hayward has a reputation for quality design, manufacturing, and long-lasting service, with unbeatable options for commercial pool operators. With a 3-year warranty, you can rely on Hayward to provide you excellent heating for your investment.


  • Patented Cupro Nickle Finn Plate heat exchanger with bronze header as standard
  • Independent left or right side electric, water and gas connections
  • 2in x 2 1/2in CPVC flanged connections
  • ASME pressure relief valve included as standard
  • Electronic lock-out feature prevents unauthorized access to configuration settings
  • Easy installation and service via access of single front panel
  • Easy gas valve adjustment
  • Easy dual voltage conversion with fuse-protected circuit boards
  • Texas Heater Kits Available
  • 500,00 BTU provides unprecedented speak to heat, with just 2 models delivering 1 million BTU'S while using minimal pump room space
  • New Warranty - 3 Years Parts and Labor
  • Dimensions: 36.5" x 29.5" x 24"
Plumbing Diameter:
Dual Voltage
Heater Fuel:
Natural Gas
Heater Pool Type:

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