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I think the thing you call an "emersion" is probably a hot water
cylinder that just happens to have an immersion heater fitted to it.
You've got air in the system. It may get better by itself if the system
has an air separator. Try bleeding rads after a couple of days.
You did bleed air from the pump too? They have big coin type screw on
the end to do this.[/quote]

Err no i didnt bleed the pump... i take it i was suppose to?
Will give that a go tonight.
Cheers OldBill