To discuss the operating characteristics of a new kind of energy-storage air source heat pump when supplying hot water

the unit’s performance in different conditions was studied by experiments. The results show that the unit can operate efficiently and stably

and the unit’s mean REE reduces with the increase of hot water supply flux. There also exists a break of hot water supply because the high flow rate of circulation water causes intensive disturbance in the heat storage tank

and the time of break is prolonged with the decrease of outdoor temperature. Moreover

the heat supple ability and mean REE of the unit reduces with the decrease of outdoor temperature.