Hayward Universal H-Series 250K BTU Low NOx Natural Gas Heater
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Specifications
- Ideal for above ground pools up to 33' Round and 21'x43' Oval and inground pools up to 28,000 gallons
- Compatible for use with swimming pools utilizing any type of sanitizing system, including saltwater systems
- Easy-to-read L.E.D. control panel provides digital temperature readout and diagnostics
- Industry-leading hydraulic performance saves energy by reducing circulation pump run time
- Exclusive "Totally Managed" cupro-nickel heat exchanger water flow
- Electronic control/display maintains water temperature; monitors heater performance with self-diagnostic capability
- Totally Managed Flow provides exceptional corrosion resistance and erosion protection Ideal for today's salt-based electronic chlorination systems
- Forced draft system constantly moves air through the combustion chamber at a precise flow rate
- Designed with 2" x 2-1/2" CPVC unions
- Installation is simplified with voltage that adapts to either 110V or 220V
- Environmentally responsible; complies with all current California and Texas air quality emission standards
- 3-Year Limited Manufacturer's Warranty on parts only (No Labor)
- Model - W3H250FDN
- Width: 28"
- Height: 24"
California residents see prop65 warnings
Description
The Hayward Universal H-Series 250,000 BTU Low NOx Natural Gas Heater (W3H250FDN) offers powerful and efficient heating for pools of all sizes, making it compatible with any sanitizing system, including saltwater. It features an easy-to-read L.E.D. control panel with digital temperature readout and diagnostics for precise operation. With industry-leading hydraulic performance, this heater saves energy by reducing circulation pump run time, while the "Totally Managed" cupro-nickel heat exchanger ensures superior corrosion and erosion resistance, ideal for saltwater systems. The electronic control/display maintains optimal water temperature and monitors heater performance with self-diagnostic capabilities. Its forced draft system guarantees precise air flow through the combustion chamber, ensuring consistent heating. Environmentally friendly, this heater complies with all air quality standards, and its installation is made simple with adaptable voltage. The W3H250FDN is backed by a 3-year limited manufacturer’s warranty, offering long-term reliability.
Brand / Manufacturer

For over 80-years, Hayward has been helping pool owners enjoy the pleasures of pool ownership by manufacturing cutting edge, technologically advanced pool equipment worldwide. Hayward strive's to ensure that your Totally Hayward System operates at maximum efficiency all season long. Hayward's goal is that at the end of the day, your only concern is to turn your equipment on and off. Hayward provides the latest in pool pumps, filters, heaters, cleaners, controls, lighting, and salt chlorination.
Customer Reviews

Popular Questions
The water depth inside the pool will be reduced by the typical 3" sand base under the vinyl liner and the fact that you will not fill the pool to the very top. Pools do need to be filled to a level of at least halfway up the skimmer opening to allow water to enter the filter without air. This would be at the 45" mark on a 52" high pool and the 47" mark on a 54" pool…
See full answer »To safeguard the pool wall during back-filling, it's highly recommended to place a protective barrier. Options like roofing rubber or tar… See full answer »
If you would like to apply for financing through PayPal Credit, they offer 0% interest for 6 months. Just select the "PayPal" button on the Payment page. Answer 2 quick questions, accept the terms, and you will know within seconds if you are approved. To apply for financing through Affirm… See full answer »
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Investing in a specifically designed pool helps prevent corrosion and ensures your pool remains in top condition for years. See full answer »
Sorry, we do not install pools or recommend pool installers. You could try a Google search for “above ground pool installers” (for more specific results try adding your ZIP code at the end of the search). Additionally, searching on SuperPages, HomeAdvisor or Angi may also help you find a local pool installation company…
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