hi i have recently developed a problem with my boiler. i have heat out of my radiators but not all of them certain rads heat up then cool off whilst offers stay hot. just of late my hot water taps will give hot water for 30 seconds then go cold. i have just bled the air out of the hot water tank and it seems a little better but i still get a rushing sound everytime i put hot tap on. help please i have had enough now. any advice would be gratly appreciated
