If the cold water supply is pressurized then hot water supply should be pressurized, for this application pressurized solar systems are proposed.
Complete Solar DELUXE MODEL consists of collectors, pressurized dish end hot water tank with the heat exchanger, interconnecting piping and electrical backup, it heats the water indirectly. It is recommended for pressurized water supply and for having hardness more than 80 PPM and for snow bound area for antifreeze.
It has all the components same as in Thermosyphon whereas the heat exchanger is outside the hot water storage tank and circulation through pumps and having differential control for highest output recommended for an industrial and commercial organization where the size of the tank is large.