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Thanks for the replies, we now have water pumping around the system. To do this I connected a mains supply by the cylinder and back-filled the system, then once started up I bled a lot of air out of the pump (previously had been some air in pump but bleeding did not help). There does sound...

Also I have a manual valve to bleed air from next to the cylinder - is an automatic vent valve required if the cylinder is the high point on the heating circuit?

Ah, I have flow on bottom of cylinder :oops: Will switch them round this afternoon, see if that helps.. I have blown through the cylinder when dry and it was clear. Pete

Bucket test shows pump is ok and pump valves are open.

Ok pump is working fine and valves are open. And I have now fitted means to bleed the air at the cylinder return (which is the highest points save the F&E tank. Still hot water gets to the cylinder but no further, so this also indicate pump is working but something is preventing flow all the...

Hello, I have just moved my cylinder up to the loft and raised the tanks which were in there up above it. The system is a vented, fully pumped, indirect one. With only the cylinder loop connected to the boiler (no rads hooked up yet) the flow gets very hot right up to the cylinder coil...