Home / Standards / GB 20665-2015 GB 20665-2015 Active Minimum allowable values of energy efficiency and energy efficiency grades for domestic gas instantaneous water heater and gas fired heating and hot water combi-boilers 家用燃气快速热水器和燃气采暖热水炉能效限定值及能效等级 Standard Type GB ICS 27.010 CCS F01 Status 现行 Issue Date 2015-05-15 Implementation 2016-06-01 Responsible Dept 国家标准委 Drafting Unit N/A