NORMALLY AN EXTERNAL FILLING LOOP ON THESE, YOU CAN FIND IT NORMALLY JUST UNDER THE BOILER AS YOU FOLLOW THE PIPES DOWN. THEY ARE SOMETIMES SITUATED IN WEIRD AND WONDERFUL PLACES LIKE IN A CUPBOARD, UNDER THE SINK, IN A SEPERATE ROOM ETC, JUST DEPENDS ON THE INSTALLATION! YOUR BEST BET IS TO TRACE THE PIPES ONCE THEY LEAVE THE BOILER AND HOPEFULLY FIND A SILVER BRAIDED HOSE WITH EITHER ONE OR TWO ISOLATING VALVES.
ANDY, October 2007
