With open circuit split systems the water is circulated from the tank at ground level through the solar collectors by an electric pump called a ‘Pump Station’. As the sun heats the water in the solar collectors, the increase in temperature activates the circulator. The Pump Station switches on whenever the water in the solar collectors is hotter than the water in the solar storage tank. The Pump Station moves the hotter water from the solar collectors through the solar hot pipe to the solar storage tank and the cooler water from the solar storage tank is circulated to the solar collectors via the solar cold pipe to be heated by the sun’s energy. This process continues whilst solar energy is available and the water in the solar storage tank requires heating. The Pump Station will deactivate when the water temperature in the solar storage tank is around 70°C to 75°C.

The GMO split solar water heater is designed to be installed as an electric boosted solar water heater with its booster heating unit connected to a power supply.