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Hey thanks for the reply. Basically not quite sure what system it’s is as it’s 15-18 years old all I know is it has a tank in loft than another Water heater tank which located in an airing cupboard in the bedroom n a pottern boiler in the kitchen.

Hi I have Siemens RWB2E programmer and I can only control the heating only twice for the day and want to upgrade it so I can control the heating and hot water throughout the day, can I replace the programmer with just any digital programmer.