As early as 2002, Japan's Daikin Corporation introduced a single-stage swing-rotor compressor of carbon dioxide heat pump water heaters. System rated power consumption 1.21kW, evaporator placed outdoors, can provide 65 ~ 90 ℃ hot water, water tank capacity of 300 liters / 370 liters, its rated heat 4.5kW, under standard conditions (outdoor air temperature 16 ℃ / 12 ℃, water temperature 17 ℃, water 65 ℃) COP up to 3.72, noise 45 dB. Over the same period, Panasonic also introduced its own tank capacity of 370 liters of carbon dioxide heat pump water heaters.
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