re: #642 windsagio

Bottom line is sq meters of panel. I happen to be an apartment dweller. But south facing panel racks are very possible. At my latitude, you are limited to south facing surface area. The math is easy. Just plug in the installed cost per meter of tiles or panels or whatever works.

Hell, forget electricity, just heat your water with roof pipes. Hmm copper pipe per linear foot compared to gas for heater. Hmmm. More math.