It's not a noticeable improvement in efficiency for solar heating. Solar heating was already ~70% efficient at converting incident sunlight to heat for water he

It's not a noticeable improvement in efficiency for solar heating. Solar heating was already ~70% efficient at converting incident sunlight to heat for water heating [0]. So it's important to note that this efficiency includes losses for circulating the water within the storage system. [0] http://en.wikipedia.org/wiki/Solar_water_heating#Economics.2C_energy.2C_environment.2C_and_system_costs http://en.wikipedia.org/wiki/Solar_water_heating#Economics.2...