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Thanks both - you're right, I didnt understand how the system worked. I turned the boiler upto 70c, turned the thermostat to 20c and left the downstairs radiator TRVs on 3, the upstairs on 5 and it works OK. The radiators do cool / heat as required to maintain teh room temperature. My concerns...

hi - just had a new Valiant condenser boiler and new radiators fitted, replacing an ageing system. Problem is, I cant get the upstairs radiators nice and hot. They are cool upstairs but hot downstairs. So, I turn up the boiler to max - 70c or 75 (which ive since been told I shouldnt do) -...