John Rumm wrote:
Dave Baker wrote:

No it's ********. Nothing can work "better" with less flow. It's
easier to bend
and fit of course and when time is money that's of the essence.
Whether it'll
actually harm your system is another matter. If the flow to the rads is
sufficient and they all get hot then it's fine.


You also can run into limitations if you are talking about radiators
with a very large heat output - there comes a point where the microbore
will not have the heat supply capacity to get the designed output from
the radiator.


Indeed. I calculated that the maximum heat transfer through 1m of 8mm
pipe is 2.28Kw and obviously less through longer pipes so any rad over
2Kw (ie a fairly 'normal 600 x 1200 double) would not reach temperature
if fed with microbore

Nick Brooks