The Viessmann Vitodens 100 is a Gas Fired Modulating Condensing Wall Mounted Boiler. The Viessmann Vitodens 100 is available in two models the WB1A 8-24 and WB1A 8-30 both of which have a efficiency of 95.1% AFUE making them Energy Star rated in the US and in Canada they authorized to carry the EcoLogo mark. […]