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The Hayward H-Series 250K BTU is a natural gas in-ground pool and spa heater rated at 250,000 BTU/hr with an 83-84% thermal efficiency rating. It uses a cupro-nickel heat exchanger that holds up to salt pools, a silicon nitride ignition for fast light-off, and a digital LED display with self-diagnostics. It is Low NOx certified for states with air quality rules. The best new price is $2,399.00 at eBay as of November 7, 2026, with 7 stores listing it new.
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Lowest price we've seen: $3,699.00 on Nov 7 at Leslie's Pool Supplies. Tracked across 7 stores since Nov 7.
Owners of the H-Series generally report dependable heating and fast warm-up, with the cupro-nickel exchanger holding up in salt pools. Complaints center on ignition and sensor faults after a few seasons and on the cost of service calls.
Hayward W3H250FDN Universal H-Series, Low NOx, 250,000 BTU, Natural Gas, Pool and Spa Heater delivering durability, reliability, and energy efficiency.
