Viessmann’s Vitodens 100 condensing space-heating boiler can now deliver on-demand domestic hot water with the new CombiPLUS Kit. It can be mounted underneath or beside the boiler with minimal piping and electrical connections, as part of a new boiler installation or as a later addition to a compatible Vitodens 100. The compact, virtually silent unit integrates a stainless-steel plate-type heat exchanger, built-in pressure bypass, three-speed DHW/space-heating pump and three-way diverting valve. Built-in temperature and flow sensors ensure consistent supply, and DHW heating is managed through the boiler’s on-board