No heating yet. I did test it a few times over the last few weeks to make sure it works.
We have new double glazing, insulated loft and walls.
We also have five people in the house, so what's that 60 watts per person?
However, i have noticed the house has never dropped below 18C overnight. During the day it seems to raise it's self to 20C+. (Hive app data)
We recently had the house rendered. It was for cosmetic reasons only.
But it seem to have had a positive effect on the heat retention.
I didn't think an inch of render was going to make much difference. But i do think the fact it waterproofs the walls does.
Since the bricks are no longer getting wet, there is no heat sapping evaporation going on.