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time to go to bed you say under 15 L i thought it said 151 lol sorry

you should have a prv with the unvented unit, you might also check that a 22mm mains supply is needed,see manufactures instructions. most unvented prvs come with a combind in line strainer, not forgeting none return valve. you also should be registered to fit unvented systems. as for the plastic...

normal plastic pipe is ok for hot and cold, and you need barrier pipe for central heating i think, im sure some one might correct me on that ?

did you mean pressure reducing valve,

being a copper person i dont use a lot of plastic pipe, i think barrier pipe is double layered with with some thing in the middle if that make sense, then there is just the single walled pipe. its poss there calling single walled, barrier pipe, any body else got any ideas ?

john is right about the Magnaclean its a good bit of kit, and yeah it is hard to unblock mico boar, but its worth a try shutting down the rest of rads and pushing the water trough one. its worked for me in the past and it dose not cost any think to try, good luck with it

have you tried turning all rads off apart from the one thats cold and runing the heating to see if it will shift any possible blockage as its more than one , do one at once

its hard to say wiyh out looking at the lay out of the house, but it is posible a pipe or pips could be flatend or traped, one customer i went to, the 10 mm ran ran along the scirting board and she had flatend it with the hover in too of her rooms, it might be worth looking for damage

lol yeah i though that, being a flat it might be low water content, eg micro bore ?

are you on small bore 22mm flow and returns, 15 mm to rads or mico bore 10 mm to rads, have you had any work done that might have flattened a pipe ?

you might have mico leaks from your rad valves where the water evaporates before you can see a leak, i normally paste the valves when installing to curb this happening, i can take some time to see this but if you keep an eye on the pipe work and look for wight steins appearing. depending on the...

that's if there piped up right, ( unless you have duel flow valves ) one way to test which side the flow is, turn your heating on and see which tube on your rad gets hot first,