What size solar heat hot water system do I need?

As circumstances vary considerably amongst households, it is suggested that a qualified solar water heating specialist (sales person or installer), carries out a site visit to determine your unique needs.  Remember that the solar geyser has to be big enough to hold the entire hot water requirement of the household for a period of 24 hours or more.  An undersized system defeats the objective of installing a solar water heating system, as you will need to use the electrical backup too often to heat the contents of a smaller storage vessel.