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

Mfg #:
W3H250FDN |
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Hayward Universal H-Series Propane Gas 250,000 BTU Low NOx, W3H250FDP

The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional.


  • 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 1/2in 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


  • 5
    Great heater you can install yourself

    Posted by Frank Y on Aug 21 2020

    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.

  • 5
    So far so good

    Posted by Matthew on Jul 24 2020

    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.