A measure of heat pump efficiency is the Coefficient of Performance (COP) or Energy Efficiency Ratio (EER)–these terms actually mean the same thing, COP for heating standard, EER for cooling standard. COP refers to the ratio between how much energy a heat pump produces and how much electricity it consumes. The Seasonal Coefficient of Performance (SCOP) is often used as a year-round and realistic measure – it is based on the COP and normalized climate under different conditions. Under the same working conditions, the higher the COP, the better the performance of the machine and the more energy saving.
The heat pump units are mainly reflected in high efficiency, energy saving, environmental protection, and safety. No flammable or explosive gas, no electrical propelling components, absolutely safe; no waste gas, wastewater, and waste residue discharge, absolutely environmental protection; the annual average operating cost of the air source heat pump unit is only 1/4 of the electric heat pump, and 1/3~1/2 of the fuel and gas heating equipment, 1/1.5 of general solar equipment.
Compared with coal-fired boilers, oil boilers, gas boilers, and electric water heaters, air-source heat pump water heaters have the highest thermal efficiency. The efficiency of oil boilers is 65%-75%, that of electric water heaters is 70%-80%, and that of air source heat pumps is as high as 300%-500%(In theory, the efficiency of air source residential heat pumps can deliver heat up to 600% (Data refer to the Energy Efficiency Council). Because the heat pump water heater has a thermal efficiency of 300%-500%, the cost of producing hot water is extremely low, and it can help users save a lot of energy power in long-term operation.
For example, using a 750W~910W air source heat pump of 220V~240V power supply, each time (Compressor works once) can produce 160L~180L of hot water, which can be used by 2~4 people, and the daily power consumption is 2~3KW/h (when the ambient temperature is low in winter, the power consumption will be slightly higher, but still the most energy-efficient). If using a 2000W 200L electric water heater, it needs to consume 15 kW/h of electricity every day for heat preservation and heating (the power consumption will be higher in winter). So compared with electric water heaters, air source (heat pump) water heaters can help users save up to 70~80% of electricity bills per month, and at the same time, they can reduce a lot of greenhouse gas emissions.
