topping up the water in a boiler

HI ON THE ASSUMPTION THAT YOU HAVE A COMBI BOILER THAT DELIVERS INSTANT HOT WATER WHEN YOU TURN THE TAP ON :- THERE ARE MANY POSSIBILITIES HOWEVER ONE IS AN EXTERNAL FILLING LOOP THAT IS SILVER /CHROME IN COLOUR AND THIS WOULD BE USED TO FILL THE SYSTEM UP BY OPENING THE VALVES UNTIL THE PRESSURE REACHED BETWEEN 1 TO 1.5 ON THE PRESSURE GAUGE AND THEN YOU TURN THE LEVERS OFF.. THE NEXT METHOD COULD BE AN INTERNAL FILLING LOOP OR INTERNAL LINK:-LOOK UNDER THE BOILER AND IF IT IS A VAILLANT BOILER WITH AN INTERNAL LINK THERE WILL BE TWO LEVERS THAT NEED TO BE TURNED TO THEIR OPEN POSITION ONCE THE REQUIRED PRESSURE HAS BEEN REACHED THEN JUST TURN THEM OFF . THE WORCESTER HAS AN INTERNAL LINK AND SOMETIMES HAVE A BIG WHITE KEY THAT NEEDS TO BE POSITIONED CORRECTLY TO ENABLE A SAFE REFIL.

my advice would be to go on youtube and there are plenty of videos showing you how to do this. A word of caution if you have a water softener ensure that this is closed off and open on the bypass as many boilers will corrode if filled with softened water. remeber to close the bypass on completion and open up both sides of the water softner. also remeber to close the filling loop/link as some people dont and it P's out the pressure relief.