The amount of solar collector area needed relates to the size of the solar cylinder.The size of cylinder required is dependent on: the number of people in the household. the amount of hot water required daily for baths, showers etc. the number of collectors may also depend on available roof space.  Typically, a home with a family of four will need two solar flat plate collector panels or a thirty evacuated tube collector. Why not Contact Us to arrange for a free site visit by one of our fully qualified advisorsand see if we can start helping you to Save Money and help Reduce your Carbon Footprint.