84% Efficiency

Series 3

Gas, Water
Cast Iron Heat Exchanger

Advanced Energy Saving Features Integrated with a Flexible Modern Design

The Series 3 shares many of its features with the award winning ES2, including the durable cast iron heat exchanger, rugged heavy gauge steel base, and the innovative IQ Control System. The IQ Control System allows the Series 3 to be easily equipped with an optional energy saving control package that, according to many studies, can deliver up to a 15-20% reduction in fuel consumption. In addition, the Series 3 provides even more flexible chimney venting options making it the right choice for millions of homes.

  • Natural or LP gas
  • Exclusive IQ Control System platform
  • Optional LCD touch screen for system monitoring
  • Time proven cast iron design for durability and reliability
  • Optimum venting flexibility for homes with existing chimneys
  • Limited Lifetime Manufacturers Warranty
  • Optional 5 or 10-year parts & limited labor warranty
  • Extended Boiler Warranty Plans are administered by CornerStone United, Inc.