I have balanced all the radiators but can not get a 20 deg temperature between flow & return at the boiler end. What do I need to do? Someone told me I have to back the boiler up but how do I do that?
I have a worcester bosch greenstar heatslave 18/25 combi, hot water is 50 deg C & the flow/Rtn has a difference of 8 deg C. I can borrow the gear to check the temp tomorrow it measures flow temp / Rtn temp & the difference between them. I have been told by a plumber I need to back the boiler up or something to that effect, but this was while I was out and in a rush so didn't have time to ask him how
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