Stuart Smith wrote:someone has since told me that these aren't as effective as the tube type of panel
Michael Bushman wrote:Stuart,
The evacuated panels are more efficient but that doesn't matter in Tuscany as you don't have long snowy winters which is really the only time when that "efficiency" matters. The flat plastic panels work great anywhere it is warm. In addition, the cost difference is staggering! In addition, the weight and thus engineering is greater with the evacuated panels again making the simple flat panels much cheaper.
As for sighting, the long and more sun, the more hot water but again, how much hot water do you need? Nothing more expensive than building in capacity you don't use!