You should be aiming to simulate ~30-35deg flow temp for this time of year; you’ll only reach your max design flow temp of 40-45deg when it’s sub-zero outside.
quite a bit of insulation left to do (i'm also in glasgow so possibly a bit colder here) - floor isn't completed yet. I also need to get into the attic and make sure the insulation covers the whole ceiling as I know there are gaps atm.
You should be aiming to simulate ~30-35deg flow temp for this time of year; you’ll only reach your max design flow temp of 40-45deg when it’s sub-zero outside.