b,b,u back boiler heating only works when hw is asked for

[jamia]

there are no cylimder stat or room stat , just a control that slides over for hw or ch the system is gravity hw and pumped ch when i ask for hw the pump kicks in how can i wire a stat in and get ch only when asked for

 

[Dotty]

I'd go read your other thread if I were you.

Or is this mob culture?