Wall-mount combi boiler

The Vitodens 100-W B1KA wall-mount gas condensing combi boiler from Viessmann has a stainless steel Inox-Radial self-cleaning heat exchanger and fullymodulating MatriX cylinder gas burner. It has a heating input of 21,000 to 125,000 BTUH and a 95 per cent AFUE rating, is NG or LP fuel compatible, has bottom pipe connections, front access to all serviceable components and offers multiple venting options.