Hydrotherm has provided innovative solutions for the ever changing comfort needs of both residential and commercial boiler applications. Most recently, Hydrotherm has continued its product innovation with the introduction of the KN-10 one million BTUH modulating boiler. This cast iron, sealed combustion unit modulates with a 3:1 ratio to provide outstanding efficiencies of up to 93%. Designed to be used in multiple boiler applications, the KN-10's state-of-the-art design remains unrivaled in the industry.