The Standardization Administration of China (SAC) said the revised household
solar water-heating efficiency standard, GB26969-2025, takes effect Aug. 1. The
standard will force retirement of obsolete capacity and accelerate adoption of
higher-efficiency absorber materials, lower-heat-loss insulation, low-energy
smart production equipment and investment in intelligent control systems. SAC
expects sector-average product efficiency to improve about 15% (average +15%
across system types, up to +50% for some models) and projects annual electricity
savings of roughly 2.4 mln kWh.
