In some parts of the world, up to 90% of homes have solar thermal systems. It wont work for all of the U.S but there are many areas that could support a simple solar thermal system yet I don't see a lot of places selling solar thermal equipment or a lot of people installing them.
Also, just looking at rough number it appears that thermal could actually be cheaper than PV, so,
Why have you decided to heat water with Solar PV instead of Solar thermal
Also, just looking at rough number it appears that thermal could actually be cheaper than PV, so,
Why have you decided to heat water with Solar PV instead of Solar thermal