Solar Obligation for Public Buildings in Namibia (2007)

To reduce the number of poor-quality products and poor manufacturing, by setting minimum requirements for the quality level of products; furthermore, to fulfil the given goals stated by the NAMREP programme and the White Paper on Energy Policy

• New public / parastatal buildings or constructions 
• All additions to existing public / parastatal buildings without water heaters
• All public / parastatal buildings with electric geysers

System requirements:

• Solar water heaters are to be of the closed circuit/indirect type, using heat exchange with a drinking water storage tank. No drinking water is to be circulated directly through the collectors (i.e., no indirect systems).
• In a close-coupled system, heating is to operate under a natural thermo siphon principle.
• The SWH system has to be able to deliver hot water through the use of solar radiation energy alone; one has to be able to heat up its full-rated storage tank capacity of hot water from 20°C to at least 55°C during a nominal sunshine day (1,000 W/m²) at any location in Namibia.
• Solar water heaters are to possess a warranty for manufacturing defects, faulty material / workmanship and leakage from corrosion over a minimum of five years, if installed according to manufacturer’s instructions.