An Apricus solar hot water system is made up of evacuated tube solar collectors, a storage tank/hot water heater, a gas or electric booster and a solar controller and pump. We install the storage tank/hot water heater on the ground and the solar collectors are attached to the roof. The system uses a solar controller and pump to transfer cold water from the tank to the solar collectors to be heated and returned to the top of the tank. The solar controller compares the temperature of the water in the solar collector to that in the tank. When the collector is hotter than the tank the pump is switched on, transferring the solar heated water to the tank.