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Yes I had but I got interrupted halfway through writing and didn't read my post properly before I posted it. Gas boiler, pumped CH, 15mm pipes. I replaced a radiator downstairs yesterday and so had to drain the system (the old radiator was fine it was just in the wrong place). The...

You are quite correct, there is a pump in the system. However, it is the new radiator that is cold so I don't think it is sludge. Patrick

I have had to empty and refill the CH system. It is gravity fed. The downstairs radiators are each on a loop fed from upstairs. The radiators are full of water (i.e. if I open the bleed valve water comes out) but do not heat up fro several days. Then suddenly they become part of the system...

The bleed valve is manual. I have to unscrew the cap slightly each time until the water comes out of it. I do not know the temperature of the hot water but surely if any bubbles from cavitation would be downstream of the pump carried along with the water? I mean that there is NO water to...

The bleed valve is at the highest point in the hot water feed, between the hotwater cylinder and the pump inlet. The cold water is taken directly from the cold water feed and is a seperate feed from that which goes to the hotwater tank.

I have installed a pumped shower system. I used a seperate feed direct from the cold water to the pump and a separate feed from the hot water tank to the pump. The connection to the hot water tank was using a techflange that has a pipe that slopes upwards into the middle of the hot water tank...