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ChrisR, is the rpm on the pump sufficient @1900 thru 2500rpm or would I need a larger pump? Power flushed all the rads but rads are only heating up when upstairs rads are switched off. Opened rads upstairs half way and all but two of the rads downstairs heated up, the one furthest away and...

Upstairs rads hot, very hot, down stairs rads cool, 6 rads upstairs, 5 down stairs. Removed and flushed all rads, verified that valves are fully functional. The system is a sealed pressured system operating at 2bar. Pump fully functional, even bled the pump. Down stairs rads are hotter at...