I'm helping a friend move. They have one of these fancy heating/water, etc. set up, incl. above boiler. Problem is the estate agents ar now closed (Sunday) and the boiler seems to Service mode, and indicating the tank is empty.
There is an immersion heater next to it with a button to click on. This does produce hot water, but someone told us this is expensive to use... does anyone know anything about this boiler? Manual is very unhelpful...