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Hi i have a central heating system with the cylinder in the airing cupboard i have 10 radiators all with manual valves i want to change to TRV so that i can regulate temperature in te bed rooms which sometimes becomes hot i am employing a plumber/ heating engineer to do the job...

Hi I have a 15 year old central heating system with cold water tank in the loft and hot water cylinder in the aring cupboard. Boiler is a Potterton Profile model. The room thermostat Landis & Gyr is in the living room . The timer /programmer is in the kitchen i dont know what make it is...