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.
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.