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Yes the return was getting hot from cylinder don't think it had a gate valve. Magna clean is good idea should have been one put in with the boiler. There goes my Saturday!Thanks for all the help and suggestions will let you know how it goes.

Don't give up the what?yeah day job... plumbing. Im a gas installer thats trying to help a mate out you sarcastic ....nothing intelligent to say?that's possibly why your just a plumber ;) Thanks schvink all rads balanced,pump was on 2 when I got there put it up to 3,its a 2 year old ecotec .no...

Have a sludged system rads barely warm same with hot water.was told it needs a power flush the last guy said that's what it needed.i immediately thought cop out so said I'd have a look to see if I could just chemical flush it instead.went back next day and downstairs rads where getting nothing...