On Sun, 22 Jun 2008 13:41:02 +0100 (BST), "Dave Liquorice"
wrote:

On Sun, 22 Jun 2008 13:11:06 +0100, MM wrote:

I don't need it to boil. Just to get hot.

You may not need or even want it to boil but if you have a decent
collector how are you going to stop it on bright day?

If it is really a problem I'll just run some cold water into the tank.
Or cover the collector with a shiny reflector to shield it.


So this must exclude plastic (i.e. non-metal) as a material, yes?

Depends a cold water storage tank is for that, cold water. I'm sure there
will be plastic tanks out there that can cope with 100C without trouble
but I doubt you'll find them ina DIY shed or builders merchant.

Since my last post I've thought of another brilliant wheeze: A
galvanised dustbin. These are available from Wilko and elsewhere and
are dirt cheap. If it's too tall, then I can cut it down to size with
tin snips. The lid will still fit.

MM