Description
Note: Product Title reflects this boiler's DOE Output Rating

Triangle Tube's Keystone Series Condensing Boilers are designed for large residential and light commercial applications. The stainless steel heat exchanger and burner provides high efficiency, low emissions, and a high turndown to minimize short cycling. With maximum inputs of 850 MBH for boilers and 500 MBH for water heaters, the Keystone series can meet most needs with a single unit. For larger requirements the advanced control allows units to be joined and function with parallel modulation for maximum efficiency.

Features:
  • Energy efficient with 95% to 97% Thermal Efficiency
  • Stainless Steel Heat Exchanger
  • CSD-1 Standard on 500 to 850 MBH Boilers
  • Integrated Cascade
  • Multiple pump control and thermostat inputs
  • 5 to 1 Turndown
  • 75 psi Pressure Relief Valve on Keystone Boilers

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    Manuals (1)
    Specs
    Fuel Type:
    Propane
    Natural Gas
    Efficiency:
    96.6%
    Vent Type:
    Direct Vent
    System Type:
    Hydronic (Water)
    Gas Connection:
    1-1/2"
    Features:
    EI/Spark Ignition
    Direct Vent
    Condensing
    Water Connection:
    2"
    Air Intake:
    4"
    Vent Diameter:
    6"
    BTU Input:
    750000
    DOE Rating:
    724000
    Combustion Efficiency:
    96.4
    Width:
    24-1/2"
    Depth (Inches):
    38"
    Height (Inches):
    51
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