Abstract
The economical savings potential of the use of heat pumps for hot water in South Africa is investigated (specifically heat pumps that are used for the heating of water for large residential units, hospitals and laundries). The energy consumption for the heating of large volumes of water with an electrical resistance heater is calculated. This consumption is compared with the electrical consumption of a heat pump. Based on the savings in energy and the cost of the heat pump, the payback period, net present value and internal rate of return of the heat pump are determined for the main centres in South Africa. It is concluded that, in general, heat pumps, if sized correctly, are more viable than direct heating.
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