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Minimum allowable values and grades of the energy efficiency and water efficiency for smart toilets
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Minimum allowable values and grades of the energy efficiency and water efficiency for smart water closets
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GB 38448-2025: Minimum allowable values and grades of the energy efficiency and water efficiency for smart toilets
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB38448-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
CCS F 01
GB38448-2025
Replacing GB 38448-2019
Minimum allowable values and grades of the energy
efficiency and water efficiency for smart toilets
Issued on: AUGUST 01, 2025
Implemented on: APRIL 01, 2027
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Grades of energy efficiency and water efficiency... 6
5 Technical requirements... 7
6 Test methods... 8
7 Implementation of the document... 8
Annex A (normative) Test methods... 9
Bibliography... 21
Minimum allowable values and grades of the energy
efficiency and water efficiency for smart toilets
1 Scope
This document specifies the grades of energy efficiency and water efficiency and
technical requirements for smart toilets, and describes the corresponding test methods.
This document applies to smart toilets installed on cold water pipelines within buildings.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgement
of limiting values
GB/T 9195 Terms and classification of building and sanitary ceramics
GB 25502 Minimum allowable values of water efficiency and water efficiency
grades for water closets
GB/T 34549 Sanitary ware - Smart toilet
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 9195, GB
25502, and GB/T 34549, as well as the following, apply.
3.1
smart toilet
A toilet controlled by an electromechanical system or program that performs at least
one of the following functions. warm water wash (e.g., rear wash, feminine wash) and
seat heating.
NOTE 1.This includes both integral smart toilets and split smart toilets.
NOTE 2.The warm water wash function includes the nozzle self-cleaning function.
3.2
energy consumption per unit cycle
Power consumption of a smart toilet during one test cycle (1.5 h) under the test
conditions specified in this document.
3.3
standby mode(s)
Any mode in which a smart toilet provides one or more of the following user-oriented
or protective functions continuously when connected to the mains power supply.
- Other modes (including on or off of active mode) are triggered by a remote switch
(including remote control), internal sensor, or timer.
- Continuous function. Information or status display including a clock.
- Continuous function. Sensor-based function.
[Source. GB/T 35758-2017, 3.6, modified]
3.4
standby power
Average power consumption of a smart toilet in standby mode.
3.5
minimum allowable values of the energy efficiency and water efficiency for smart
toilets
Under the test conditions specified in this document, the maximum allowable energy
consumption per unit cycle, maximum average water consumption for cleaning (if
applicable), maximum average water consumption for flushing (if applicable),
maximum water consumption for full-flush flushing of dual-flush smart toilets (if
applicable), and maximum water consumption for half-flush flushing of dual-flush
smart toilets (if applicable) allowed for smart toilets.
4 Grades of energy efficiency and water efficiency
The energy efficiency and water efficiency of smart toilets are divided into three grades,
with grade 1 energy efficiency and water efficiency being the highest. The energy
consumption per unit cycle, average water consumption for cleaning (if applicable),
average water consumption for flushing (if applicable), water consumption for full-
flush flushing of dual-flush smart toilets (if applicable), and water consumption for half-
flush flushing of dual-flush smart toilets (if applicable) for each grade of energy
efficiency and water efficiency shall comply with the provisions of Table 1.Determine
in accordance with the lowest grade of each indicator in Table 1.
5 Technical requirements
5.1 Minimum allowable values of the energy efficiency and water efficiency for
smart toilets
The minimum allowable values of the energy efficiency and water efficiency for smart
toilets are the energy consumption per unit cycle, average water consumption for
cleaning (if applicable), average water consumption for flushing (if applicable), water
consumption for full-flush flushing of dual-flush smart toilets (if applicable), and water
consumption for half-flush flushing of dual-flush smart toilets (if applicable), as
specified by grade 3 energy efficiency and water efficiency.
5.2 Cleaning function
5.2.1 Water temperature characteristics
The maximum cleaning water temperature range shall be controlled between 35 °C and
42 °C. For instantaneous and thermal storage smart toilets, the water temperature
difference within 30 s shall not exceed 4 °C. For rapid-heating smart toilets, the water
temperature difference within 60 s shall not exceed 4 °C.
5.2.2 Nozzle self-cleaning
The ink line on the front 1/4 of the nozzle shall be cleaned completely, leaving no ink
residue.
5.2.3 Cleaning area
The cleaning area shall be larger than 80 mm2.
5.3 Water seal
It shall meet the requirements for the water seal depth and water seal surface dimensions
in GB 25502.
5.4 Minimum trap diameter
It shall meet the requirements for the minimum trap diameter in GB 25502.
5.5 Flushing function
It shall meet the requirements for the flushing function in GB 25502.
5.6 Seat heating function
The temperature range of all seat test points shall be controlled between 30 °C and
42 °C.
5.7 Standby power
The standby power of a smart toilet shall not exceed 3.0 W.
6 Test methods
The test methods for energy consumption per unit cycle, water consumption for
cleaning, water consumption for flushing, cleaning function, water seal, minimum trap
diameter, flushing function, seat heating function, and standby power of smart toilets
shall be conducted in accordance with Annex A.
7 Implementation of the document
For products manufactured or imported before the implementation date of this
document, implementation shall begin 25 months after the implementation date of this
document.
Bibliography
[1] GB/T 35758-2017 Household electrical appliances - Measurement of standby power
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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