Abstract
The influence of an increase in electricity tariffs on the viability of heat pumps against direct heating for large consumers of hot water in the main centres of South Africa is investigated. The energy consumption for heating 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, economic parameters are determined with current electricity tariffs as well as with an increased tariff. It is concluded that if an increase in electricity tariffs occurs, heat pumps in general become more viable, but in certain cases resistance heaters will still be cheaper to use.
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