@zoothorn can you not understand that after 56 pages no one is really the wiser about what the issue is ?
We know your house is cold .
Everyone is using educated guesses to attempt to understand WHY !
Draw a (expletive deleted)ing plan of your house . Put dimensions on . Draw the radiators in each room with dimensions. Take photos . ANYTHING to give evidence of what you have !
Personally I think this thread should be locked - because it’s a pointless joke . So much help offered ; yet all refuted.
I like to be helpful .
So buy 5 of any of these and stick 1 in each room - problem solved !!
https://www.argos.co.uk/sd/electric-heater/
< bows gracefully as the crowd clap >
Just a wild thought !
Are we all certain there are actual radiators installed ? . Not just ‘ in a box ‘ not getting to temperature.
When you remove the likely only the unlikely remains ...
Nah that’s long gone . I’ll find the invoice then I should be able to contact geberit ( or the frame supplier ) for the bits . So annoyed ! Wouldn’t throw them out !! Grrrrrr