Triangle Tube 375,000 BTU Output Keystone Condensing Boiler

Note: Product Title reflects this boiler's IBR Net 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