Sets out requirements for installation of solar water heaters (including those that combine solar with some other form of energy input). It is applicable to systems with fixed orientation and inclination, of storage capacity up to 700 L, used either singly or in multiple-unit installations. The Standard covers thermosiphon and pumped systems, either incorporating a heat exchanger or using direct circulation of potable water. Appendices include reference irradiation data, estimation of shading of collectors and recommendations for efficient use and maintenance.