On 11 Jul 2005 01:22:01 -0700, wrote:

For the last week I've had a pool staying cold in the grey weather!!

Is that with solar heating? Even on dull overcast days at this time
of year you should be able to get several hundred watts per square
metre. Brillant bright sunshine like today and you'll be over a kW/m^2

Actually, I might dig up the garden and install under-garden heating
using a coal-fuelled furnace pumping hot air round sub-terranean
chambers. Them Romans wrote the book on environmental heating
solutions, surely...

Be better to burn wood, carbon neutral.

--
Cheers
Dave. pam is missing e-mail