On 30/12/2020 16:11, Tim+ wrote:
Theo wrote:
What does the team reckon about this:
https://ibb.co/XZQ10FQ

I know the conventional wisdom is to leave a patch of ceiling uninsulated
under your cold water tank, but the tank is 3 foot in the air! There's
completely free airflow from the patch of ceiling under the tank to the cold
loft. The site is quite windy so convected heat is unlikely to make it to
the tank.

It appears to have had 1-2cm polystyrene attached to the outside (not sure
if also to the bottom, I forgot to look).

To allow me to insulate underneath while avoiding the risk of freezing the
tank, I suppose the options a

- add a better jacket to the tank
- add a heater on a frost stat inside the tank
- add a heater on a frost stat to the side/bottom of the tank
- something else?

Would tank lagging be sufficient for a tank in a cold loft, without
additional heat flux from the house?

Thanks
Theo


Could you not box in the area under the tank? Then insulate the sides of
the box (and tank) but leave the base uninsulated.

Tim

That's what I would do. You could even make the box from Celotex
extending up the sides.