Test production of hot water with heat pump system, using a bucket size 100 L have R-22 as working fluid, น้ำร้อนที่ temperature 55 oC take 120 min. This study compared the passage of economics view on electric energy cost per unit. During the production of hot water with heat pump system and electric water heater with electric power, DH5100 version 6 000 W for water temperature, 46 oC Rate, it is found that the cost of electricity per unit of production of hot water with heat pump system 1.86 prices Baht / kWth. Which is cheaper to manufacture hot water electric heater DH5100 version with the energy cost of electricity per unit price 3.58 Baht / kWth. The difference 1.72 Baht / kWth is 1.92 times of energy saving.Key words: system heat pump, electric heater, the cost, the energy consumption per unit.
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