"Andy Dingley" wrote in message
...
On 14 Oct, 19:12, The Natural Philosopher
wrote:

the insulation requirements for hot water are a lot less demanding than
molten salt :-)

That depends on the salt.

Molten sodium is the stuff to use.
Then you can add water and use the hydrogen in an emergency. ;-)

I remember the trials of aluminium and sodium hydroxide as emergency
batteries for exchanges if anyone has scrap aluminium around.