Here's the one installed on the FL house http://kyocerasolar.eu/
Here's a start on one system from one of their articles http://www.atlantisenergy.org/sunslates2.html Both are for producing electricity.
I beleive you will find the price to be closer to $35000 rather than $3500 though.
For just hot water suplamental heat http://www.viessmann-us.com/web/cana...eme_ca_english
Probably in the range of $5000 to$7000
Jack