Hayward Universal H-Series Low NOx Pool & Spa Heater | 150K BTU Natural Gas | W3H150FDN $2,999.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 150K BTU Propane Gas | W3H150FDP $2,999.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 200K BTU Natural Gas | W3H200FDN | 52902 $3,699.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 200K BTU Propane | W3H200FDP $3,699.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 250K BTU Natural Gas | W3H250FDN $3,999.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 250K BTU Propane Gas | W3H250FDP $3,999.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 400K BTU Natural Gas | W3H400FDN $5,099.00 Hayward Universal H-Series Low NOx Pool & Spa Heater | 400K BTU Propane Gas | W3H400FDP $5,099.00