Vaillant Pipe Assembly (Page 4)
The water pipework can be separated in to two categories. The first would be the pipes that allow water to be fed in to the heating unit. This would include the mains water supply and the water pipework on the wall jig. The second category would be the pipes within the appliance that are responsible for carrying water between the different devices of the unit that require it, such as the diverter valve and pump.