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See Chinese contents: GB 30721-2014 GB 30721-2014: Minimum allowable values of energy efficiency and energy efficiency grades for water-source (ground-source) heat pumps
This Standard specifies the minimum allowable values of energy efficiency, evaluation values of energy conservation, energy efficiency grades, test methods, and inspection rules for water-source (ground-source) heat pumps. This Standard applies to the water-source (ground-source) heat pumps of household, commercial and industrial uses, and other similar uses that use electrical and mechanical compression systems and use water as cold (hot) source.
