Sorry for this, I know it has been discussed before, but I am unable to
get my head around it.
Water mains comes in to stopcock. It then goes to the outside and
kitchen tap through 15mm copper. To get the water upstairs it goes
through a 15mm plastic pipe, with the reinforcers (very small holes) up
to the bathroom. Now it is back to 15mm copper to feed the toilet
cistern, cold basin, cold bath and combi boiler. The flow from these
taps is considerably less than downstairs. Is this simply due to the
fact that it has to rise 10ft ish, or would it be better to replace the
plastic 15mm with copper 15mm?
TIA