Radiator mean temperature

[Johnytuono]

Hopefully someone can explain this.
Boiler flow is 60c, have balanced the rads to about 12c with a differential thermometer.
For some reason the flow pipes show 51c and the return 39c yet the rad. mean temperature is around 50/52c, why is this if the flow pipe is less than the mean temp.?
I have 10mm Microbore tails, the boiler does show water heated to 60c and the return is about 10c(ish less) but obviously this rises as the boiler modulates.
Anyone?

 

[Wayners]

Outer pipe temp is lower than core temperature I guess

 

[Johntheo5]

Hopefully someone can explain this.
Boiler flow is 60c, have balanced the rads to about 12c with a differential thermometer.
For some reason the flow pipes show 51c and the return 39c yet the rad. mean temperature is around 50/52c, why is this if the flow pipe is less than the mean temp.?
I have 10mm Microbore tails, the boiler does show water heated to 60c and the return is about 10c(ish less) but obviously this rises as the boiler modulates.
Anyone?

all (if) system boilers have a internal bypass, the displayed and actual boiler temperature will always be higher than the measured return temperature, I have seen numbers on here of the boiler return being up to 7C higher than the measured return due to the internal recirc. The boiler flow temperature and your measured temperature though should be quite close.