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I've just done the switcheroo between the pipe feeds with a few compression couplers. Checked for weeping leaks and nipped up the nut another 1/6 of a turn - conformed leak free and radiator warmed up quickly. Both inlet and outlet feeds are toasty. The radiator is cooler (not by much) at the...

Would you suggest swapping the pipework around immediately or seeing what it's like warming up from scratch now that water is everywhere it should be. Presuming the flow will always be crap if left as is. Trust my luck to replace like for like and the original plumber had the valves for the old...

The radiator is fairly hot now, except the last vertical bar nearest the TRV, which is probably 10C cooler. The Lockshield valve piping is significantly hotter than the TRV piping. Presumably this either confirms flow is wrong way around, or I had a big air pocket (as per the squirty noises...

Yep, I read lockshield when you said TRV. TRV head disconnected and reconnected. All other rads off - little spurty noises coming for inside the new radiator as if flow isn't coming easy and maybe it's not all full. As it has a 13 litre capacity, it might take a while.

The TRV is an Allen bolt type, the whole allen head moves up and down with a range of about 7mm height. Does that make the TRV comment redundant? I'll close all the other rads and try. Thanks.

There is an arrow from the thermostatic valve side (right on photo) to the TRV valve side for direction of flow. The air bleed valve is above the TRV valve (left on pic). 10mm micropore as per all plumbing downstairs. These are piped to the original pipework as cut from the tails of the old...

Zombie thread resurrection to save setting up a new one. We had a wall knocked out between kitchen and garage conversion. On that wall was a small radiator. The tails were hanging for ages, waiting for a plumber that never turned up over a period of a month. Further down the wall, I'd hung the...