GB26969-2025
Minimum allowable values of energy efficiency and energy efficiency grades for domestic solar water heating systems
家用太阳能热水系统能效限定值及能效等级
GB 26969-2025 is an upcoming mandatory Chinese national standard for Minimum allowable values of energy efficiency and energy efficiency grades for domestic solar water heating systems. It appears in the Construction compliance cluster with a energy efficiency focus and has an implementation date of Aug 1, 2026.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to domestic solar water heating systems with a heat storage water tank volume not exceeding 0.6m³. It covers various system types including compact, separate indirect (split double-circuit), separate direct (split single-circuit), integral collector storage (ICS), and space heating systems. It is mandatory for manufacturers producing these systems for the Chinese market. The standard references GB/T 19141 and GB/T 18708 for technical conditions and test methods.
Technical requirements
The standard classifies the energy efficiency grades of domestic solar water heating systems into three levels, where Grade 1 represents the highest efficiency and Grade 3 represents the minimum threshold. The minimum allowable values of energy efficiency correspond to the requirements of Grade 3. It introduces specific energy efficiency coefficients (CTP) for different system configurations, including newly added requirements for space heating systems. The CTP is determined by evaluating the ratio of the measured daily useful heat gain to the standard minimum value, and the ratio of the measured average heat loss factor to the standard maximum value, using a specified weighting coefficient. This 2025 revision updates the CTP thresholds for existing categories and removes previous evaluation values and basic requirements found in the 2011 version.
Testing methods
Testing involves measuring the daily useful heat gain per unit contour lighting area and the average heat loss factor of the system. These parameters must be tested according to the procedures outlined in GB/T 19141 and GB/T 18708. Manufacturers must calculate the CTP using the prescribed formula with a weighting coefficient of 0.8 to determine the final energy efficiency grade. The standard provides informative annexes with calculation examples for each system type to guide compliance verification.
FAQs
What products are regulated under GB 26969-2025?
GB 26969-2025 regulates domestic solar water heating systems with a storage tank volume of 0.6m³ or less, including compact, split, and space heating types. Compliance is mandatory for market access in China.
What are the key changes in the 2025 version compared to GB 26969-2011?
The 2025 version updates the energy efficiency coefficient (CTP) thresholds for most system types, adds a new category for space heating systems, and removes the energy-saving evaluation values and basic requirements. Manufacturers must re-evaluate their products against the new Grade 3 minimum allowable values.
How is the energy efficiency grade determined?
The grade is based on the calculated CTP, which factors in the daily useful heat gain and average heat loss factor. The system is assigned Grade 1, 2, or 3 based on specific CTP ranges, with Grade 3 being the minimum compliance threshold.
The summary above provides a high-level overview of GB 26969-2025. To ensure complete compliance for your domestic solar water heating systems entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 26969-2025 today to access all detailed parameters, CTP calculation tables, and testing procedures.
Applicability hints
- Type
- Management
- CCS
- F01
- ICS
- 27.010
- Competent department
- Standardization Administration of China
- Technical committee
- National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China
Relationships
Replaces:GB 26969-2011 (Current)