Solar heat system

In a solar water heater system which includes a collector, a storage tank, a circulating pump, and pipeline means intercoupling the collector, storage and circulating pump to enable the pump to circulate a fluid through the collector to be heated therein, and returned to the storage tank, said pipeline means including a supply line extending from the pump to the collector and a return line extending from the collector to the storage tank;

• the combination of:
• a drain line, an electrically energized valve module coupling the pipeline means to the drain line, and a control module connected to the valve module for selectively establishing the valve module in an energized operating condition in which a circulating path for the fluid is established from the pump through the collector to the storage tank, and for selectively establishing the valve module in a de-energized operating condition in which the fluid in the collector is discharged through the drain line;
• said valve module including electrically activated means for selectively establishing the valve module in its energized operating condition in response to an electric signal from the control module, and spring means for establishing the valve module in its de-energized operating condition in the absence of such electrical signal, and said valve module further including a first valve interposed in the supply line, said first valve being set to an open operating position by said electrically activated means when said valve module is in its energized operating condition, and said first valve being set to a closed operating position by said spring means when said valve module is in its de-energized operating condition, and said valve module including a pair of valves respectively coupling the supply line and the return line to the drain line, said pair of valves being set to a closed position by said electrically activated means when said valve module is in its energized operating condition, and said pair of valves being set to an open position by said spring means when said valve module is in its deenergized operating condition.