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Symptom: Boiler fires up for 30 seconds, raises the flow temperature too high and then cuts out. The return pipe eventually gets to just barely warm (after hours of the repeating cycles like that). The first 2 – 3 radiators upstairs heat up ok, with the following 2 – 3 being just barely worm...

I am planning to replace my current combi boiler with Atag a325ec (after lots of reading from the posters on this forum). I also want to install a two zone UFH in 2 rooms downstairs. Can someone help me to understand how the boiler/radiator control (if there was no UFH) would integrate with UFH...