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If your home has hot water radiators in each room for heat, you have a boiler to heat the water. Like a furnace, the energy efficiency of a boiler is given as the Annual Fuel Utilization Efficiency (AFUE). Boilers manufactured since 1992 must have an AFUE of at least 80%. We offer a complete line of gas boilers starting at 80% AFUE and up.

Gas Boiler Product Offering


High Efficiency Gas Boiler

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Model Family: K2WT
Annual Fuel Utilization Efficiency: 95% AFUE with 10:1 turndown
Energy Star Rated: ENERGY STAR®
Heat Exchanger Warranty: N/A
Warranty: 5-year parts warranty
Manufacturer's Stated Benefits:
  • Stainless steel heat exchanger offers long-term reliability
  • Attractive, reinforced 16 and 22-gauge steel construction
  • Advanced system testing carefully verifies the performance every K2 boiler before it leaves the factory
  • Factory pre-set Sage2.3™ Control System, providing out-of-the-box high performance
  • Touch screen diagnostic display with plain-language guidance
Series 3

High Efficiency Cast Iron Gas Boiler

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Model Family: Series 3
Annual Fuel Utilization Efficiency: 84% AFUE
Energy Star Rated: No
Heat Exchanger Warranty: Limited Lifetime Manufacturers Warranty
Warranty: Limited Lifetime Manufacturers Warranty
Manufacturer's Stated Benefits:
  • Natural or LP gas
  • Optional LCD touch screen for system monitoring
  • Time proven cast iron design for durability and reliability
  • Optimum venting flexibility for homes with existing chimneys
  • Optional 5 or 10-year parts & limited labor warranty
  • Extended Boiler Warranty Plans are administered by CornerStone United, Inc.