IEC 63159-1:2021

Overview

IEC 63159-1:2021 is an international standard published by the International Electrotechnical Commission (IEC) that addresses household electric instantaneous water heaters. Specifically, it covers the methods for measuring the performance of these appliances, focusing on general aspects that ensure consistent and accurate evaluation of energy efficiency for domestic hot water heating applications. This standard applies to models that heat water below boiling temperature and fulfill at least one load pattern specified by Annex A of the document.

The standard primarily defines essential terms and definitions, outlines measurement methods, and specifies test conditions to enable uniform assessment but does not address appliance safety requirements. IEC 63159-1:2021 forms the foundational part of a multipart series related to performance testing of electric instantaneous water heaters.

Key Topics

• Scope and Application: Applies to electric instantaneous water heaters for household use with sub-boiling water heating capability, covering a variety of load profiles.
• Terminology: Standardizes definitions such as electric instantaneous water heater, closed/open outlet types, temperature selectors, flow regulators, smart control, static electric losses, and more to ensure clear communication in testing and documentation.
• Measurement Equipment: Specifies requirements for monitoring temperature, flow, and power with defined accuracy to ensure precise performance evaluation.
• Testing Protocols: Describes general test setup, including the number of appliances to be tested, environmental conditions, and methodology for capturing efficiency data.
• Energy Efficiency Metrics: Defines test methods for static efficiency, start-up losses, daily energy demand, and the calculation of overall efficiency, embedding concepts like the smart control factor (SCF) and declared load profiles.
• Load Patterns: Outlines a series of operational load profiles (Annex A) representing typical usage scenarios to simulate real-world energy consumption during tests.
• Test Setup Details: Provides schematic diagrams and detailed instructions for testing both open and closed instantaneous water heater designs (Annex B).

Applications

IEC 63159-1:2021 is essential for:

• Manufacturers developing or improving household electric instantaneous water heaters aiming to verify and optimize their products' energy efficiency performance.
• Testing laboratories and certification bodies conducting standardized performance assessments for regulatory compliance or product benchmarking.
• Regulators and policy makers establishing minimum energy performance standards and labeling schemes for household water heating appliances.
• Energy auditors and consultants assessing appliance efficiency and recommending energy-saving improvements in residential hot water systems.
• Consumers and end-users looking for reliable, energy-efficient water heating solutions aligned with international performance standards.

Using this standard ensures transparency and comparability of energy efficiency claims, thereby fostering energy savings, reducing greenhouse gas emissions, and supporting sustainable energy consumption in households.

Related Standards

• IEC 63159-2-1: Methods for measuring the performance of multifunctional electric instantaneous water heaters.
• IEC 63159-2-2: Efficiency testing procedures for single point of use electric instantaneous water heaters.
• ISO 2768-1: General tolerances for linear and angular dimensions without individual tolerance indications, often referenced for precise appliance manufacturing.
• ISO 228-1: Standard for pipe threads where pressure-tight joints are not made on the threads, relevant to water heater plumbing connections.

These complementary standards support the comprehensive testing and certification framework necessary for full product evaluation across performance and safety aspects.

By adopting IEC 63159-1:2021, stakeholders can ensure accurate energy performance measurement for household electric instantaneous water heaters, aligning with international best practices for sustainable and efficient domestic hot water solutions.