We have a new condensing boiler retro-fitted to our existing system: Baxi Solo He 15, 8 rads some with TRVs.
With the pump at its lowest setting, I set the flow to about 64 C and the return to about 52 C.
I balanced the rads as per faq, all now have a 12 deg C drop across all rads except a kick space heater which i didn't touch. (There are ball valves on its two supply flexible pipes so I could tweak that as well)
I haven't quite grasped the theory behind condensing boilers. Am I right in thinking that if the return is below 55 C then the boiler should be operating in condensing mode?
Thanks to all who replied to my original post: Fred, Ed and Dr D.
Francis Kirby