UFH upstairs rooms not getting to temp

[Biggiebig]

So i've manage to get some stability since Saturday night. 

 

Basically I opened all the zones so all my thermostats are constantly on then using the high UFH temp I warmed up the house to a comfortable 

21-23 deg in various rooms and then I crank the temperatures right down but everything is running constantly.

 

Downstairs is running around 30 deg 

Upstairs is running at the lowest on mixer which is 40 deg

 

All the rooms have been a stable temperature for 2 days with no drops. Now I know that temps have also increased so i've yet to test in sub zero temps but at least now i'm not experiencing low temps. So thank you everyone for the helpful comments 

 

Next I will be purchasing Salus auto balancing actuators   to have optimum flow rates. 

 

 

 

Edited January 22 by Biggiebig