The SPS-2-AC Solar Pump Station by Purist Energy is a prepackaged solar hot water appliance that includes most components required for a solar hot water installation in a single appliance. The SPS-2-AC forms the basis for a Closed Filled Loop system. It circulates a heat transfer fluid to the collectors and back to a heat exchanger, where the heat is transferred to the stored potable (drinkable) water for use. The solar loop is completely filled with fluid, and since it is exposed to outdoor temperatures, requires a non-freezing mixture of water and Propylene Glycol (not automotive antifreeze) in areas prone to freezing. In a closed filled loop system, there are two “loops”, or piping circuits. The “solar loop” travels to the solar collector and back, and the “potable loop” draws water from the storage tank and returns it warmer. The two loops are separate and do not mix, but both connect to the heat exchanger where heat is transferred from the solar to the potable loop. For the solar loop, the unit contains the heat exchanger, a circulator pump, pressure/temperature gauge, pressure relief valve, fill and drain valves, and a check valve. In addition to the collectors, a fluid expansion tank and air vent is required to be installed external to the SPS-2-AC on the solar loop. For the potable loop, the unit contains the heat exchanger and a circulator pump. The SPS-2-AC also contains controls for powering the pumps when the water is heated by the collector, monitoring for faults, and eliminating excess heat from the system if necessary.