upgrading combi CH pump ?

Question

My first post....I moved into a 4 bed large old house 1 year ago.  it has a fairly newcombi boiler Worcester 35CDi.   some of the rads never even get warm,others did. others were very hot.   At first i thought the boilerwasnt up to the job of powering 16 mostly large rads however readingother posts and not wanting to spend money on a bigger boiler i amwondering if the pump needs upgrading f there's a circulationproblem.  Trouble is its part of the boiler package so could be trickyto replace or alternatively could an additional pump be fittedsomewhere else in the system?any suggestions anyone?  i dont want another winter of discontent !Keith

ARWadsworth · Accepted Answer

also make sure that your house is as well insulated as possible.Adam

ARWadsworth · Answer

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

fullflow plumbing · Answer

KeithFollow 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 luckRichard

upgrading combi CH pump ?

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