UPS3 pump settings - radiators slow to heat up

[Richard28]

I have a UPS3 Grundfos pump and it says I should
Use PP settings for a 2 pipe system. I have selected the higher PP II setting. I have 16 radiators of which 5 are doubles. The radiators take a long time to get fully hot.

Is the PP II setting ok or do I need a faster setting?

Thank you.

 

[cross thread]

may be the boiler output rather than pump speed , what size boiler have you got.

 

[Richard28]

30KWH

 

[cross thread]

could be the boiler needs rating to suit the system if they produce to much heat early on the boiler can shutdown. Or a circulation issue