Universal H-Series Natural Gas 250,000 BTU Low NOx
Hayward
SKU: H250FDN
Hayward Universal H-Series gas heaters are the"universal" energy efficient remedy for any new or existing pool or spa.
Features
Hayward Universal H-Series gas heaters are the"universal" energy efficient remedy for any new or existing pool or spa. An industry-leading hydraulic design reduces circulation pump run time to provide energy savings of up to 18% when compared to less efficient competitors. The energy efficiency of the Universal H-Series gas heater combines with environmentally friendly low NOx emissions, a standard cupro nickel heat\ exchanger, and ultimate installation flexibility to responsibly heat a pool or spa today and for years to come.
Features and Benefits
- 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
- Reduction in pump run-time results in significant cost savings
- 2" x 2 1/2" CPVC union plumbing connections
- Forced draft system constantly moves air through the combustion chamber at a precise flow rate, eliminating the need for a high-wind stack
- Low NOx emissions - meets clean air quality standards
NOTE: Hayward Universal H-Series heaters meet or exceed the South Coast Air Quality Management District (SCAQMD Rule 1146.2) Low NOx emissions standards in all Low NOx areas that apply the SCAQMD standard.

- EXPERT LINE products can only be purchased through your local pool professional or in-store. Exclusions, other terms, and conditions may apply.
Exclusions, other terms and conditions may apply.
| Active Defrost | No |
|---|---|
| Application | New Construction, Renovation, Aftermarket |
| Boost Mode | No |
| Brand | Hayward |
| Channel | Expert Line |
| Circuit Amps | 5.5 |
| Compressor Speed | N/A |
| Cooling Capability | No |
| Fuel Type | Natural Gas (NA) |
| GTIN | 610377027274 |
| Heating Capacity (BTU/hr) | 250,000 |
| Hertz - Heaters | 60 Hz |
| Kilowatts | 73 kW |
| Warranty - Labor | 1-year |
| Low Ambient Operation | Yes |
| Master Carton Qty | 1 |
| Maximum Breaker Size (Amps) | 15 |
| Pallet Qty | 1 |
| Warranty - Parts | 3-year |
| Phase - Heaters | 1 |
| Pool Type | In Ground |
| Product Dimensions | 24 " x 25 " x 29.5 " |
| Product Height | 24 in |
| Product Length | 29.5 in |
| Product Weight | 165 lb |
| Product Width | 25 in |
| Refrigerant | Yes |
| Series Heaters | Universal H-Series Low NOx |
| Shipping Dimensions | 29.3 " x 32 " x 33 " |
| Shipping Weight | 165 lb |
| Silent Mode | No |
| Sub Brand | N/A |
| Voltage - Heaters | 120/240V |
Questions & Answers
15 answered question(s)
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Q: What is the error when Lo is on the display?
By Hayward Support
Q: How to light or start heaterl. Lo is on screen
By Hayward Support
Q: Hello, I have a saltwater pool in Michigan . I get 4 years out of my Raypak natural gas 266,000 heater, it's rusts out. Would it require a lot of gasoline and plumbing to swap out with one of your salt water pool heaters? Thank you
By Hayward Support
Q: Must the pool pump be running in order to circulate water thru heater and for heater to heat pool water?
By Hayward Support
Q: Hello, I live in Ontario Canada. My 20 year old H250 has always been a sufficient heater and is situated approximately 20' from the pool. I plan to replace it with another H250, however previous recommendations (on this blog) suggest that an H400 is the better option for 18x36 pool.
By Hayward Support
Q: Hello. I am installing this heater outside my pool house which has wood siding. Does the 6” rear clearance still apply?
By Hayward Support
Q: Looking to replace an old Hayward H350ED1 pool heater. I see you only sell 250 or 400 units now. pool is 20x40 rectangular salt water. Is my natural gas meter a factor as to what size I should get?
By Hayward Support
Q: Hi. We just purchased new a H250FD pool heater. Can this be programmed to operate remotely/wirelessly via my phone? How? Thanks.
By Hayward Support
Q: What is the best size heater for a 30 ft diameter above ground pool (21,000 gallons)?
By Hayward Support
Q: I want to connect a Fireman Switch
By Hayward Support
Q: Which pool heater has 150,000 BTU/HR output?
By Hayward Support
Q: I am from Canada (Gatineau Quebec near Ottawa) and I have a H250 FDN natural gaz heater purchased in 2018. The heater is located aprox 70 feet away from the pool and the pool is 16 x 32 feet with aprox 80000 liters. To heat the pool from 65 to 78 F, it takes aprox 26 hours or haft degree per hour. Is it normal or my heater is défective?
By Hayward Support
Q: How do I transfer the gas line from entering from the left side to the right side?
By Hayward Support
Q: Had a power outage on my pool heater and when the power came back on the control panel doesn’t light up anymore. Change the three fuses that are in the control area. When my next step be to purchase another control panel or transformer or any suggestion, suggestions would help.
By Hayward Support
Q: Will this H series heater directly replace my Pentair 460732 heater? It is also natural gas and 250k-btu.
By Hayward Support

