the article discusses heat as waste, to me heat is never a waste it is utilizable energy. How do they capture this heat for transfer to a water tank, assuming we are talking stationary cells.
[link|http://www.cowi.dk/news/uk/2001/news_cowi_0530b2001.htm|PV/T] cells are already around... I don't see why this form of phot-voltaic cells couldn't be used.
Also do you happen to know what the refractory effect of water would do to the cells in a panel.
*smile* Not sure... I'm no expert on solar cells...