The communication pipe is the pipe owned by the water authority;it communicates from the main supply in the street across the boundary of the home owner, this is the point when the pipe is no longer the water authorities concern.
We are an accredited unvented installation company and would supply and install a 300 litre unit for around £2500 plus vat, subject to the boiler being compatible and D1 and D2 are able to be taken to a safe discharge point without any problems.
You must also understand that the unit will only...