Hayward Universal H-Series W3H250FDN Natural Gas Heater 250K BTU 120/240V is an energy efficient, high performance, installation adaptable commitment to the pool service professional. Universal H-Series heaters offer exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you get season after season of premium heating performance.

Features:

• Standard cupro-nickel heat exchanger
• Excellent salt water and chemical corrosion resistance
• Exclusive "Totally Managed" cupro nickel heat exchanger water flow
• Same water velocity through all tubes for faster heating
• Patented header by-pass design
• Up to 18 percent savings by reducing pump run-time
• 2in x 2 1/2in CPVC union plumbing connections
• Common union for installation or service, adapts to larger plumbing recommended for greater efficiencies
• Low NOx emissions - meets clean air quality standards