Keystone Condensing Solo Boiler

Keystone Boiler

Keystone Condensing Boilers provide powerful solutions for large residential and light commercial applications with 5 models with inputs from 399 to 850 MBH. These products feature a stainless steel heat exchanger with a thermal efficiency between 95 and 97%. Their compact design minimizes floor space while the cabinet provides easy access to all components. The large user friendly control interface makes set-up easy. The advanced control modulates the boiler with a 5 to 1 turndown ratio. Up to 8 boilers can be joined in a cascade while the control features parallel modulation and boiler rotation to maximize efficiency and service life.

Warranty Info

10 Year Limited Warranty & 1 Year Limited Parts Triangle Tube hereby warrants the Keystone Condensing Boiler &/or Keystone Condensing Water Heater when properly registered with our factory at the time of purchase (as set forth below) to be free from defects in material or workmanship. Triangle Tube will repair or, at its option, replace the component part under the conditions explained in paragraph 4 , hereof.

Features or Benefits

  • 7 Boiler models from 399 to 1,200 MBH
  • Stainless steel heat exchanger
  • ASME Stamped Heat Exchanger
  • Thermal efficiencies of up to 97%
  • Turndown ratios up to 10:1
  • Compact footprint
  • Boilers 500MBH and greater are CSD-1 compliant
  • Low Nox - 2012 SCAQMD Certified
  • Large color touch screen display
  • Cascade up to 8 units for a capacity of 4,800 MBH
  • Modbus protocol included for BAS integration
  • Average life span exceeds 20 years

Performance Specifications

Boiler Model Fuel Input MBH Thermal Efficiency % Combustion Efficiency % DOE Heating Capacity Turndown Ratio Net AHRI Rating MBH
KS 399 T Natural Propane 80 - 399 96.5 96.5 386 5 : 1 336
KS 500 T Natural Propane 100 - 500 95.0 95.0 475 5 : 1 413
KS 600 T Natural Propane 120 - 600 95.3 96.0 572 5 : 1 497
KS 750 T Natural Propane 150 - 750 96.6 96.6 724 5 : 1 630
KS 850 T Natural Propane 170 - 850 95.7 95.7 813 5 : 1 707
KS 1000 T Natural Propane 100 - 1,000 94.2 94.2 942 10 : 1 819
KS 1200 T Natural Propane 120 - 1,200 95.1 94.8 1120 10 : 1 974