Solar Hot Water Pumps & controls are the equipment used to pump the energy collected (in the form of heat) from the solar collectors to the hot water storage tank.   The pump (circulator) circulates the heat transfer fluid, when it is commanded on by the solar controller.  The controller monitors the temperature of the solar collectors, and water storage tank; when the set ΔT is reached between the collectors and the water storage the pump is turned on.  Here are a few examples of solar pumps & controllers that we have installed.