Hi Pete
You have a leak in the boiler or radiator system at some point,check the pipe terminating outside from the presure release valve on the boiler to see if leaking (thyis is usually the copper pipe pointing downwards directly under flue termination check all visible pipework to radiators and valves to see any leak and repair
you must sort this problem out as if you are topping system up everyday you are letting fresh corrosion into system and will cause alot of damage to boiler and radiators
If you are filling up boiler once a day the leak is detectable
tony
February 2008