A.forced circulation using a pump
B.the fact that hot water is less dense than cold water
C.the fact that cold water is less dense than hot water
D.gravity flow from top of the collector to the lower storage tank
A.forced circulation using a pump
B.the fact that hot water is less dense than cold water
C.the fact that cold water is less dense than hot water
D.gravity flow from top of the collector to the lower storage tank