upgrading combi CH pump ?


My first post....
I moved into a 4 bed large old house 1 year ago. it has a fairly new combi boiler Worcester 35CDi. some of the rads never even get warm, others did. others were very hot. At first i thought the boiler wasnt up to the job of powering 16 mostly large rads however reading other posts and not wanting to spend money on a bigger boiler i am wondering if the pump needs upgrading f there's a circulation problem. Trouble is its part of the boiler package so could be tricky to replace or alternatively could an additional pump be fitted somewhere else in the system?
any suggestions anyone? i dont want another winter of discontent !
Keith
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http://www.diyfaq.org.uk/plumbing/rad-balance.html
and also make sure that your house is as well insulated as possible.
Adam
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And a PS.
Keith, you may also have airlocks to some of the rads. Turn off all rads but the rad you are wanting to bleed. Stick the heating on and then bleed that rad.
Adam
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Keith
Follow Adams suggestions above & hit the boost button on your boiler - great boilers these and i`ve fitted a few to similar sounding properties (glad your getting the gas bill not me though !). Replacing the pump with bigger/extra one is not realy an option but make sure yours is set to maximum flow.
If the above doesn`t clear your problem then id suggest increasing the pressure in your system (say 2.0 bar when cold) and slackening the valves of the offending radiator to `pull` a quick amount of water through it, have towels & drain trays handy though. Maybe also worth getting the system cleaned out or powerflushed.
best of luck
Richard
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