Tank insulation top up

rn

I have a copper, factory insulated copper tank, however it has a lot of gaps in the insulation for various inflows and outflows - about 8 gaps. Coupled with that, the plumber who installed it really stripped back the insulation around where the immersion goes into the tank.

I want to top up the insulation in these areas specifically. I had an idea to cut aeroboard - but its nearly impossible to shape and get right.

Is there an expandable aerosol can I can buy that is safe to use on copper? or any other solution

I have attached two photos as an example of what I'm trying to insulate.

North West

Hi rn
You can buy expanding foam in any builders merchant or diy outlet.Be careful when putting it on , it triples in size when you release it from container. You can then shape it as you want.
Nw

rn

Hi NW,
Have you used it on copper cylinder before? would it be safe to use round the immersion element part?

jack of all

I think your cylinder is fine as is, you shouldn't cover the immersion heater anyway (this will be written or stamped on the metal cap which covers the terminal connections). The heat losses through the lack of insulation in these locations will be minimal and not worth worrying about, in my opinion. You might be better off making sure pipes connected to the cylinder are insulated and pipe entry points through the ceiling overhead are sealed, as per building regulations.