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Thanks Rouguetrader but the Wilo control unit on the manifold (not the wiring unit or the mixing valve/pump stat - see Emmeti U9700090 T3 Control Group) has one dial which has a venting option which I have already down at the start of the commissioning process - that automatically defaults to...

Thanks Dan and Muggles for quick response I was not given a design or specified a flow rate by the company who installed it. They did pressure test before and during but I do not know what pressure this was at.

Hi Have installed an Emetti UFH system under Agilia A screed. Two zones, 3 loops (one large kitchen for 2 loops and one utility for one loop) in a refurbishment/extension. Loops 1&2 kitchen, Loop 3 utility. It has been running for ten days now, I started at 20 C and raised to 55 C by 5 per...