The KN-10 commercial gas-fired boiler has a self-adaptive design that is tolerant to changing conditions, says the manufacturer. The company states that the boiler combines the high efficiency of modern copper boilers with the long-life reliability of cast iron boilers. It has Tru-Flowâ„¢ technology designed to control the air fuel mixture at all firing rates and venting conditions. According to the manufacturer, combustion air is measured constantly to fine-tune the fuel gas flow through the gas valve, thus eliminating elevation corrections. The unit provides a 1-MBtuh input in a condensing design with efficiencies up to 93 percent. The footprint is less than 27 inches wide.
Hydrotherm, a division of Mestek, 260 N. Elm St., Westfield, MA 01085; 413-564-5515; www.hydrothermkn.com.