I'v have had the boiler for a year now and although it's still under warranty, I'm not getting much joy from the manufacturer.
The pressure keeps on dropping so I have to re-pressurise
regularly.
The hot water is very erratic... it varies from very hot to like warm/cold while having a shower or washing up.

Ricky, December 2012

are you 100% sure you haven't got a leak on your system pipework?.If not call them out over and over until they come up with a fix.Other line of approach is to get whoever supplied you with it involved as they are responsible for the goods under the sale of good act

A1, December 2012