According to SANS 10400-XA all pipes must be insulated to an R-value of 1.00, as the biggest energy saving is achieved by preventing the loss of heat from your hot water pipes. (See thermal image tab). It is a good rule to insulate at least 1m of the inlet pipe going into your geyser and all the outlet pipes going from the geyser. Not only does this prevent energy loss, but it also aids in the prevention of frozen pipes in your ceiling during cold winter periods. 

The national standard "Energy Efficiency for Buildings" SANS 10400-XA has been published and South Africa is divided into six climatic zones according to their humidity and temperature variations. Legislation of insulation has been introduced for new buildings stipulating the minimum R-value required for ceilings/roofs in each climatic zone.
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