new direct hot water cylinder

[bludger]

Hi,

I want to replace my gravity fed hot water cylinder as it is too small and its only insulation is a jacket. I read somewhere a couple of years ago that the newer, supposedly better, sprayed on foam insulation can lose something or other over time and become less efficient at retaining heat. Anyone know if this is true?

If it is, what's the solution? Would a cylinder with an extra outer casing be better?

In anticipation...

 

[ChrisR]

The foam does come unstuck from the copper. You can always put an extra jacket or a knackered sleeping bag over it!