Replaced two Radiators, been told we now need to replace pipes feeding radiators…

Another question time (sorry) I was reading that the ideal temp difference between the in and out should be 12 degrees?

So if going in, it’s say 58, and coming out it’s 32, is that within normal range, or would I open or close the lockshield a bit to adjust?
 
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Closing the lockshield down sounds wrong to me. If the input is 58 and the output is 32 then surely there is too little water flow through the radiator as it is radiating away 26 degrees by the time it leaves. I would think opening the lockshield valve would allow the water to get from the input to the output quicker and thus radiate less of it's heat away by the time it leaves. If it's 58 on the input you should be aiming for 46 on the output.
 
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Morning everyone, firstly, thank you all for the thoughts/suggestions - really appreciate it.

Just a quick update, have been playing with the balancing, have managed to get 99% of my radiators hotter, and one of the two new replacements that’s being problematic, is also warmer.

The final radiator is being stubborn.

With everything else off, it gets red hot, with everything on, red hot at the top, lukewarm at the bottom.

Plumber is suggesting replace pipework at a cost of 1k, and that may fix it, and if it doesn’t he can do other pipes for another 1k, and that may fix it, but if it doesn’t, it could be the boiler pump or something else entirely.

Not keen on paying 1k for a “this might fix it, but might not”.

They worked before, now they don’t.

Have been nosing around, and the only difference they made when replacing, was the had to extend the pipes a little, as the new rads sit closer to the wall, so they cut the pipework, and extended it using plastic push fit/compression angle connectors, rather than the old copper pipe that just went straight up.

Could that be contributing to the problem?
 
they cut the pipework, and extended it using plastic push fit/compression angle connectors, rather than the old copper pipe that just went straight up.

For the same OD, plastic usually has a smaller ID:

So yes, it could be the problem, but not 100% clear from your description if any plastic pipe is in use, or just some plastic fittings. Maybe a picture would help.
 

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