In reply to [email protected]'s message of Tue, 18 Sep 2012 19:42:46 -0400 (EDT): Hi, [snip] >I know of a few locations where it would be nice to have passive solar hot >water in the summer. I have noted that a black garden hose in the sun >produces hot water. The hose could be placed on a roof. The problem is >getting this heat into a storage tank passively. The hot water tank would >have to be mounted higher than than the hose. I would like to employ the >ordinary basement hot water tank. Hot water rises and will not go down to the >basement tank. >
Such solar hot water systems are common. Previously the tank used to placed on outside of the roof above the collector. Nowadays, more frequently inside the roof cavity. (both looks and works better). Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html

