The Vitodens 100-W space heating or combi boiler series from Viessmann is designed for condominiums and other homes that require a reliable, compact heating solution. Rated input is 21 to 125 MBH. The 100-W is equipped with a stainless-steel heat exchanger for lasting performance and reliability, plus a fully modulating MatriX Plus cylinder gas burner. Other features include low-NOx, 10:1 turndown ratio, zero clearance to combustibles, quiet operation,
and multiple venting options.