On Wed, 15 Aug 2018 19:40:04 +0100, Tufnell Park wrote:

If it is for a bedroom running costs would be comparable with the
storage heater as you shouldn't need to heat it for 24 hours only when
occupied.

That very much depends on the building. The heating is never off here
otherwise the structure cools down and it takes, literally, days to
warm back up and the place become comfortable again. About half of
the days since the begining of August have had the heating come on at
1600 when the setpoint changes from 18.5 to 20C. With no heat things
get cold (10C) and noticeably damp.

--
Cheers
Dave.