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KN Product Family American Made Cast Iron Boilers Home Boiler Products Select Your KN Family Efficiency: 90%* BTU Range: 200,000 - 4,000,000 BTUs 5:1 continuous modulation for maximum efficiencies at all levels of heat demand. Footprint: Compact *up tp 90% AHRI Efficiency: 96%* BTU Range: 600,000 - 4,000,000 BTUs 5:1 continuous modulation for maximum efficiencies at all levels of heat demand. Footprint: Compact *up tp 96% AHRI Have Questions? Contact your local representative Contact