Hayward | H250FDNASME | 250,000 BTU - Natural Gas, Low NOx, Universal
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The Hayward H250FDNASME Universal H-Series ASME Heater is a 250,000 BTU natural gas unit designed and certified for commercial use. It is the flagship of Hayward's H-Series line, built around a Cupro-Nickel Finn Plate heat exchanger with a bronze header for corrosion resistance in demanding, chemically intensive water.
Key Features
- 250,000 BTU natural gas heating capacity
- ASME certified and designed for commercial aquatic facilities
- Cupro-Nickel Finn Plate heat exchanger with heavy-duty bronze header
- Low NOx burner system compliant with current California air quality emission standards
- Industry-leading hydraulics that reduce required pump circulation time
- Flexible plumbing and gas connection options for new builds and retrofits
- Front-panel access for straightforward servicing
Specifications
- Brand: Hayward
- Model / Part Number: H250FDNASME
- Series: Universal H-Series ASME
- Heating Capacity: 250,000 BTU
- Fuel: Natural gas
- Emissions: Low NOx
- Heat Exchanger: Cupro-Nickel Finn Plate
- Header: Bronze
- Certification: ASME
- Application: Commercial pools, spas, hotels, fitness centres, aquatic facilities
Frequently Asked Questions
What does ASME certification mean here?
ASME certification covers the construction of the heat exchanger to pressure vessel standards. Many jurisdictions require an ASME-certified heater for commercial and public pool installations, so it is often a code requirement rather than an upgrade.
Why Cupro-Nickel rather than copper?
Cupro-Nickel resists corrosion far better in aggressive water. Commercial pools run higher bather loads, heavier chemical dosing and sometimes salt, all of which shorten the life of a standard copper exchanger.
Is this heater legal in California?
The Low NOx burner system complies with current California air quality emission standards. Local permitting still applies, so confirm requirements with your jurisdiction before installation.
Can I use it on a residential pool?
You can, and some large residential pools and spas benefit from ASME construction. For a standard residential pool it is usually more heater than needed, and a non-ASME H-Series model will cost less.
Is it natural gas or propane?
This model is natural gas. Propane versions carry different part numbers, so check the model before ordering.
What gas supply does it need?
A 250,000 BTU heater has specific gas line sizing and supply pressure requirements that depend on your run length and what else is on the line. Have your installer size the gas supply before purchase, since an undersized line is the most common cause of poor heater performance.
Does it require professional installation?
Yes. Gas connection, venting, electrical, plumbing and code compliance all require a licensed installer. Improper installation also voids the manufacturer warranty.
Can it replace my existing commercial heater?
Often, yes. The flexible plumbing and gas connection options are designed for retrofits. Compatibility still depends on your gas supply, plumbing layout, venting and available space, so have your installer verify before ordering.