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8mm could easily be damaged but if working pressure is ok can be used But i would put 15mm in as it is more rigid and putting in a 8mm gas cock would cut the flow down more.

Not very good customer service, what if you wanted a service call after the boilers fitted would it be the same? I contacted the rep 2 months ago still hasnt got back to me Have a worcester roughly same price, they have there recommended installers on there web site, you get 5 years gurantee...

Hi I think Transco guy did the right thing, Make safe, The fault is with the installer who needs to be contacted to make the installation correct in 15mm copper with a isolation valve accessable, if he cant be contacted or is no help report him to gas safe

Hi Diverter valves go regulaly if it was not a genuine worcester part as there is alot of cheaper universals out there, I agree the knocking is expansion on joists, try lagging pipes on joists Has the pressure dropped b4 or only after the diverter valve was swapped if it wasnt check the...

Hi Worcester is best, if its fitted by a recommended installer you will get 5 years parts and labour cover plus 10 years cover on the heat exchanger Main one of baxi group not as good has either 1 year or 2 guarantee

Hi The display code isnt a fault it happens when power is turned on and off to the boiler, putting it into a 15 mins minimum heat setting , it explains this in the installation book under 'commissioning, starting system'. The fault could be wireless stat or programmer or being that it is...