Hayward Universal H-Series Low NOx 250K BTU Natural Gas Pool Heater
Pool Heater
Hayward Universal H Series Low NOx Natural Gas Heater - 250K BTU
250K BTU Hayward Universal H-Series Low NOx natural gas pool heater for reliable residential pool and spa heating.
Warranty Information
1-Year Limited Manufacturer Warranty
Professional installation is recommended. Ultimate Pools provides local sizing guidance, installation coordination, and product support.
The Hayward Universal H-Series Low NOx 250K BTU Natural Gas Pool Heater (W3H250FDN) is a natural gas pool heater designed to deliver dependable heating performance for residential pools and spas.
This Hayward heater helps maintain comfortable swimming temperatures, extend your pool season, and provide fast heat-up performance when properly sized and professionally installed.
For best results, confirm your heater size, fuel type, gas supply, plumbing layout, and installation requirements before purchase.
Main Features
Compact, service-friendly design built for reliable pool and spa heating.
Engineered to meet low NOx emission requirements for cleaner combustion.
High-output gas heating helps bring pools and spas up to temperature quickly.
User-friendly controls support accurate temperature management.
Built for outdoor equipment pad operation and long service life.
Ultimate Pools can help confirm sizing, gas requirements, and installation details.
Best For
- Residential pool and spa heating
- Natural gas equipment pad installations
- Replacing an aging or undersized pool heater
- Pool owners wanting faster water warm-up
- Professional installation and sizing support
Specifications
| Model / SKU | W3H250FDN |
| Brand | Hayward |
| Series | Universal H-Series Low NOx |
| Product Type | Natural Gas Pool & Spa Heater |
| Heating Capacity | 250K BTU |
| Fuel Type | Natural Gas |
| Application | Residential pool and spa heating |
| Heater Line | Universal H-Series Low NOx |
| Other Available Sizes |
W3H150FDN - 150K BTU W3H200FDN - 200K BTU H250FDN - 250K BTU (Expert Line with 3-Year Warranty) W3H400FDN - 400K BTU |
| Warranty | 1-Year Limited Manufacturer Warranty |
| Manual | Download Product Manual |
Frequently Asked Questions
Pool heater sizing depends on pool volume, desired temperature rise, plumbing, gas supply, and seasonal conditions. Contact Ultimate Pools for sizing guidance.
Yes. Gas pool heaters require proper gas sizing, venting clearances, plumbing, electrical connections, and local code compliance.
Yes, properly sized pool and spa heaters can support both pool and spa heating applications depending on the system layout.
Check your existing heater model, BTU rating, gas type, plumbing size, and equipment pad space. Ultimate Pools can help confirm compatibility before purchase.
Ultimate Pools provides local support for heater selection, installation questions, troubleshooting, and warranty guidance.