Hayward Universal H-Series Gas Heater 400K BTU

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The Hayward Universal H-Series Gas Heater 400K BTU is the most reliable, hydraulically efficient product for your spa or pool. Because of the gas heater’s advanced heating technology, the product can greatly lengthen the swimming season, increase overall comfort, conserve energy, and drastically lower fuel costs.

Hayward’s strong commitment to developing earth-friendly heating solutions is evident by this product’s innovative technology. The gas heater’s energy-conserving features include a finn plate heat exchanger that is equipped with a special V-groove design, sophisticated stainless steel burners, and Fire Tile combustion chambers that are extremely insulated.

The product contains an electronic control display that is designed to track heater performance and maintain the warm water temperatures. The exclusive silicon nitride ignition system delivers reliable lighting and operation with just the push of a button.

The product has a 83 percent thermal efficiency and meets state and federal air quality emission standards. The low NOx emissions makes the gas heater a great solution for environmentally concerned spa or pool owners.

The gas heater is really easy to install and even features low and high voltage connections that can accommodate right and left side junction boxes.


  • Totally managed flow provides exceptional corrosion resistance and erosion protection. Ideal for today’s salt-based electronic chlorination systems
  • 83% Thermal efficiency
  • Industry-leading hydraulic performance saves energy by reducing circulation pump run time
  • State-of-the-industry finn plate heat exchanger with special V-groove design for faster heating and longer life
  • Easy to install
  • High and low voltage connections are easy and convenient with left and right side junction boxes
  • Exclusive silicon nitride ignition system for dependable lighting and reliable operation
  • Electronic control display maintains water temperature, monitors heater performance with self-diagnostic capability
  • Unlike older forms of insulation, FireTile securely traps the heat, delivering the most performance from each BTU
  • Environmentally responsible


  • Brand : Hayward
  • Item : Low NOx Pool Heater
  • Series : Universal H-Series
  • Gas Type : Natural
  • Headers : Polymer
  • Control Type : Digital Electric, Dual Thermostat
  • Tubing Material : Cupro Nickel
  • BTUH Input : 399900
  • Cabinet Width : 36 Inch
  • Cabinet Depth : 29-1/2 Inch
  • Cabinet Height : 24 Inch
  • Flue Diameter : 6 Inch
  • Gas Connection : 3/4 Inch
  • Water Connection : 2 Inch x 2-1/2 Inch Unions
  • Voltage Rating : 110/220 V
  • Frequency Rating : 60 Hz
  • Phase : 1-Phase


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