Hayward W3H250FDN Universal H-Series 250,000 BTU, Natural Gas, Pool and Spa Heater 
"Totally Managed" Flow saving energy by reducing pump run time
Silicon Nitride Ignition System
Cupro-Nickel Heat Exchanger ensures compatibility with almost all pool systems including salt pools
Low NOx certification
83-84% industry-leading thermal efficiency
Patented header by-pass design
Corrosion resistance
Digital LED display
High and low voltage options (110V or 220V)
3/4" Gas Connection at heater
delivery available/ installations and removal of old heater