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thanks for quick response, i will continue with micro adjustments on the lockshields and i will add one to the heating coil [ none of the books i read mentioned that ] although now youve pointed it out i suppose its obvious thanks again peter

thanks tony , situation is much improved , i think i may have pushed the limits on length of run of 22mm pipe as bungalow goes off in all directions . also there are some longish runs of 15mm feeding some of the rads . would increasing some of these runs to 22mm possibly help thanks peter

I installed oil fired heating in an old sprawling bungalow 2 years ago and have trouble getting water to the far end of run ,unless i shut off several rads at the boiler end of the system . i have tried balancing system several times but have concluded [maybe incorrectly] that pump just isnt...