Hello, my boiler gives hot water to the shower to start with and then runs out. The boiler is still showing water "On" and if I leave it for a while it seems to deliver water again. The shower has a Deva mixer valve and I wondered if that could have a fault?
Both the boiler and shower are new so I will get the plumber back but just wanted to know if I'm expecting too much from my system. Any thoughts appreciated.

Steve Revill, February 2010