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need guide how to flush central heating system and radiator. which solution for descaling. cheers

hi guys, just read energy saving article in newpaper and then check my boiler. the boiler is potterton suprima 60 , immersion heater with economy 7,expansion tank in the loft, gas running cost of 450£ a year, 3 bed room detached house. the question is should i need to change to...