Why is it so rare to see rooftop solar water heaters in America while such devices are commonplace in China?
A.
Such devices cost a lot more to install in America than in China.
B.
People in Americanlive in much larger homes as compared to hose in China.
C.
People in the US typically have water tanks in their basements or garages.
D.
It didn't help them to lower the energy costs while cutting carbon emission.