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Hayward Universal H-Series Propane Gas 250,000 BTU Low NOx, W3H250FDP

Hayward Universal H-Series Propane Gas 250,000 BTU Low NOx, W3H250FDP

Mfg #: W3H250FDP


UPC: 610377387248

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Hayward W3H250FDP Universal H-Series Digital Low NOx Pool Heater; Liquid Propane Gas, 250000 BTU, 110/220 V, 60 Hz, 1-Phase, Cupro Nickel

Presenting Hayward's world-class heater with an Earth-friendly conscience... the Universal H-Series heater! While all Hayward H-Series heaters are energy-efficient, the Universal H-Series Low NOx heater has an 83-84 percent industry-leading thermal efficiency and complies with all current California and Texas air quality emission standards. The low NOx emission makes it a perfect choice for the environmentally concerned pool owner.

Enjoy a warmer pool this season without your fuel costs skyrocketing. Hayward's H-Series heaters represent innovative heating technology for pools and spas. Its hydraulic performance also saves energy by reducing the circulation time of the pump. It can raise the temperature of an 800 gallon pool 30 degrees in less than an hour - you'll feel the benefits the moment you step into the water. This approach to heating your pool is an efficient use of energy - showing once again our commitment to developing earth-friendly products.

Other performance and efficiency-enhancing advances include stainless steel burners, corrosion-resistant Finn Plate heat exchangers with Cupro nickel, and insulated Fire Tile combustion chambers. This traps the heat unlike other forms of insulation delivering the highest degree of performance from every BTU. Equipped with an LED control panel it monitors heater performance for added convenience and maximum comfort with minimum effort. The ignition system delivers dependable lighting and reliable operations with just a touch of a button. The forced draft system constantly moves air through the combustion chamber to eliminate all outside weather variables affecting heating performance, such as wind conditions, eliminating the need to install a high-wind stack.

Additionally, the Universal H-Series heater is easy to install and combines advanced technology with universal-fit flexibility making it virtually compatible with any new or existing equipment pad. This heating mixture sustains your swimming season, adds to your comfort, is energy efficient, and reduces your fuel costs. This low NOx emissions heater is perfect for you and the environment - all at the same time.

Pool Heater Features:

  • Industry-leading hydraulic performance saves energy by reducing circulation pump run time.
  • Totally Managed Flow provides exceptional corrosion resistance and erosion protection. Ideal for today's salt-based electronic chlorination systems.
  • State-of-the-industry Finn Plate heat exchanger with special V-groove design for faster heating and longer life.
  • Unlike older forms of insulation, Fire Tile securely traps the heat, delivering the most performance from each BTU.
  • Exclusive silicon nitride ignition system for dependable lighting and reliable operation.
  • Installation is simplified with voltage that adapts to either 110V or 220V.
  • High and low voltage connections are easy and convenient with left and right side junction boxes.
  • Electronic control/display maintains water temperature; monitors heater performance with self-diagnostic capability.
  • Standard cupro nickel heat exchanger
  • Excellent salt water and chemical corrosion resistance
  • Exclusive "Totally Managed" cupro nickel heat exchanger water flow
  • Same water velocity through all tubes for faster heating
  • Patented header by-pass design
  • Up to 18 percent savings by reducing pump run-time
  • 2in x 2.5 in CPVC union plumbing connections
  • Common union for installation or service, adapts to larger plumbing recommended for greater efficiencies
  • Low NOx emissions - meets clean air quality standards


Application In ground pools
Brand Hayward
BTU Performance 250000
Cabinet Height 24 Inch
Cabinet Width 28 Inch
Control Type Digital Electric, Dual Thermostat
Dimensions 28 inches L x 29.5 inches H x 24 inches W
Emissions Rating Low NOx Emissions
Frequency Rating 60 Hz
Gas Connection 3/4 Inch
Gas Type Liquid Propane
Headers Polymer
Heat Exchanger Cupro Nickel
Indoor Vent Pipe Diameter 6 Inch
Item Name Hayward Universal H-Series Propane Gas Pool Heater
Phase 1-Phase
Shipping Weight 165 pounds
Standards Approvals Complies with All Current California and Texas Air Quality Emission Standards
Sub Brand Universal H-Series
Thermal Efficiency 83%
Type In Ground Pool Heaters
Voltage Rating 110/220 V
Water Connection 2 Inch x 2.5 Inch Unions
Weight 134 pounds




2 Reviews

  • Posted by Frank Y on 08/21/2020


    Great heater you can install yourself

    We have a standalone spa with this 200,000 BTU gas heater. To me, this is superior to the typical electric heated self-contained systems because it heats cold tap water to 104 degrees in about 30 minutes in our 250 gallon spa. In CA, gas is cheap compared to electricity for heating. With an insulating cover, we get in and run the heater for only 6 minutes to get from 94 to 100 degrees. That way, it's not scalding hot when you get in, but cranks up fast.

  • Posted by Matthew on 07/24/2020


    So far so good

    Bought this to replace an old broken rusted out Hayward H400IDL that was about 15 years old. My old heater seemed to breakdown every 3 months or so. I’m hoping this one will be more reliable. The installation wasn’t to bad I did it myself but the biggest negative was when I called Hayward and they told me the H400FDN was an exact replacement that wouldn’t need plumbing adjustments to fit but that wasn’t the case both the water and gas connections had to be reworked to line up. Nothing to difficult.