GB/T 21362-2023 (English Version)

Standard No.: GB/T 21362-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 21362-2023
Replace: GB/T 21362-2008

Scope: It specifies the types and basic parameters, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of heat pump water heaters for commercial or industrial use and similar purposes. It is applicable to heat pump water heaters that use air or water as heat source and adopt steam compression refrigeration cycle driven by electric motors to provide hot water (with a nominal heating capacity of 3~kW or more). Other similar water heaters can be used for reference.

Introduction

Background of Standard Revision and Technological Evolution

GB/T 21362-2023, as the first revision of the 2008 version of the standard, responds to the demand for energy efficiency improvement under the dual carbon goals. The main technological evolution is reflected in:

Technical dimension	2008 version	2023 version	Range of change
Model classification	4 categories	Added static heating type	+25%
Energy efficiency index	COP single point test	AHPF annual comprehensive energy efficiency	Test cycle extended by 300%
Noise limit	Uniform value	Classification by model	Accuracy improved by 40%

Core parameters and technical indicators

1. Model classification system

Standard construction of three-dimensional classification matrix:

Heating method: one-time heating/circulation heating/static heating
Heat source form: air source (ordinary type/low temperature type)/water source
Structural type: integral type/split type

2. Key performance indicators

Model	COP limit (kW/kW)	AHPF limit	Noise dB(A)
Static heating type	2.90-4.20	2.40-2.80	≤65-78
Single heating type	3.20-4.50	2.70-3.10	≤63-76

Note: Low temperature units need to run continuously for 1h at -25℃ without tripping protection

Test method innovation

1. Non-steady-state heating capacity test

New dynamic test requirements under defrost conditions, data collection interval ≤5s, must meet the following requirements

Temperature fluctuation: dry bulb ±1.0℃/wet bulb ±0.5℃
Voltage deviation: ±2.0%

2. Water mode energy efficiency test

Added 8-level load evaluation system for units <10kW:

Grade	V40 water volume (L)	Effective internal energy (kWh)
XS	8-16	0.135-0.105
4XL	≥520	9.24-19.00

Implementation recommendations

1. Manufacturer response strategy

Optimization class=instrument>Heat exchanger design to meet AHPF requirements
Strengthen the control of hazardous substances in control system hardware (in compliance with GB/T 26572)
Low-temperature models need to verify -25℃ startup performance

2. Key focus of testing agencies

The new version of air tightness test sensitivity reaches 1×10^-6 Pa·m³/s
The hydraulic test pressure is 1.25 times the design pressure
Noise testing needs to distinguish between working conditions with and without water pumps

GB/T 21362-2023 Referenced Document

GB 25131 Safety requirements for water chillers(heat pump)using the vapor compression cycle
GB 2894 Safety signs and guideline for the use
GB 4706.32 Household and similar electrical appliances—Safety--Particular requirements for electrical heat pumps,air-conditioners and dehumidifiers
GB 8624 Classification for burning behavior of building materials and products
GB/T 10870 The methods of performance test for water chilling (heat pump) packages using the vaper compression cycle
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 1720-2020 Circle-drawing test of coating films
GB/T 17758 Unit air conditioner*， 2023-11-27 Update
GB/T 18430.1 Vapour compression cycle chillers (heat pumps) Part 1: Chillers (heat pumps) for industrial or commercial and similar purposes*， 2024-09-29 Update
GB/T 191 Packaging.Pictorial marking for handling of goods
GB/T 19409-2013 Water-source (ground-source) heat pumps
GB/T 2423.17 Environmental testing Part 2: Test methods Test Ka: Salt spray*， 2024-08-23 Update
GB/T 25127.1-2020 Low ambient temperature air source heat pump （water chilling）packages—Part 1：Heat pump （water chilling）packages for industrial & commercial and similar application
GB/T 26572 Requirements of concentration limits for certain restricted substances in electrical and electronic products
GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)
GB/T 6388 Transport package shipping mark
GB/T 9237 Amendment No. 2 to Refrigeration System and Heat Pump Safety and Environmental Requirements

GB/T 21362-2023 history

2023 GB/T 21362-2023 Heat pump water heaters for commercial or industrial and similar purposes
2008 GB/T 21362-2008 Heat pump water heater for commercial & industrial and similar application