On 25/09/2018 20:22, wrote:


results depend heavily on what airgaps are left, and those are hard to control.


On jackets I've fitted here have been minimal air gaps especially none
at the top of the cylinder where the panels overlap giving a thicker layer.

There is a table at
https://www.thegreenage.co.uk/insula...r-tank-jacket/

which suggests payback of less than 1 year in the OPs case were he had
25mm of existing foam insulation. The table figures assume the jacket
cost £25 but the OP paid £10 so their 2 year figure needs to be reduced.


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