Considering that black-body absorbers for water heating run around 75%, you might be waiting for a while? https://en.wikipedia.org/wiki/Solar_water_heating#Ene

Considering that black-body absorbers for water heating run around 75%, you might be waiting for a while? https://en.wikipedia.org/wiki/Solar_water_heating#Energy_production https://en.wikipedia.org/wiki/Solar_water_heating#Energy_pro...