The Worcester Bosch Greenstar 28CDi 28 kW Combi Boiler with Vertical Flue and Filter is appropriate for small, medium, and large homes with one or two bathrooms. The CDi compact is easy to install and maintain thanks to a low lift weight, colour-coded wiring connectors and wall mounting jig, with key components positioned to provide easy access. High efficiency, greater reliability and durability are achieved by the CDI Compact's innovative new heat exchanger. This boiler pack includes a vertical flue kit and a greenstar system filter, which have been designed to combat the damaging effects of system debris and pollutants.