[Sephiroth]

Originally Posted by Taf

Setting the boiler temperature for 50c is not working for me. 2 hours running has only got the bedroom to 17.5c and the hallway to 16.5c. It almost dropped to 0c outside last night, and is now only 2c at 10am.

At our Rutland house, we experimented with this. The internal wall radiators (single) are twice the height of a "normal" (double) radiator.
At 50C setting, the sitting room & hall heat up reasonably when the outside temperature is around 8C (not had colder than that).

The other rooms, not so well.