Plumbing Video. Plumber – Day one of the Viessmann Vitodens 111 installation. Step by step plumbing install of a Viessman Vitodens 111 storage combi boiler. Hanging on the wall. Installing a new gas central heating boiler in Leeds. Install a new boiler. Taking out a Worcester Bosch Boiler. Removing a Worcester bosch heat only boiler. Installing a new combi boiler. Checking the central heating system to see what boiler suits the system best. Removing the hot water cylinder. Power shower pump, Hot water cylinder.