How hot will my solar heated water get?

Solar water heating systems are designed to heat water to between 50° & 60° C.  Thermostats are generally set at 55°.  This is usually the same setting as for a conventional electric geyser.  Higher temperatures may be achieved in summer and during periods of low usage.  A well designed system should not get too hot.  Remember that most people bath or shower in water between 41° - 43° C.  Excessive water temperatures are a waste of energy (as you have to add cold in order to use it), and a safety hazard because if the collector were to break, the scalding water could burn people, animals and plants.