EN 60335-2-73:2003

Overview

EN 60335-2-73:2003 (CLC) is the European particular safety standard for fixed electric immersion heaters used in water tanks. It is Part 2-73 of the EN 60335 series - which deals with safety of household and similar electrical appliances - and supplements the general requirements in EN 60335-1. The standard applies to immersion heaters intended to heat water to temperatures below boiling and covers appliances with a rated voltage of not more than 250 V for single‑phase and 480 V for other appliances. Published in 2003, this document targets domestic safety and water‑heating equipment.

Key Topics

The particular standard focuses on specific safety aspects for fixed immersion heaters. While EN 60335-2-73 complements the general clauses of EN 60335-1, the key technical topics typically addressed include:

• Scope and definitions - precise application limits (water heating below boiling point) and appliance types covered
• Rated voltages and electrical classification - applicability for single‑phase ≤250 V and other appliances ≤480 V
• Construction and materials - design considerations to withstand the water environment and long‑term use
• Electrical safety and protection - measures to reduce risk of electric shock in water‑containing installations
• Thermal and mechanical safety - methods to limit local overheating and protect against mechanical failures
• Ingress protection and corrosion resistance - suitability for use in tanks and compatibility with water chemistries
• Marking, instructions and documentation - required labels, user information and installation guidance
• Testing and verification - conformity assessment tests that ensure performance under normal and fault conditions

Note: EN 60335-2-73 is a particular standard and is intended to be read together with EN 60335-1; it does not replace the general requirements.

Applications

EN 60335-2-73 is directly relevant to:

• Manufacturers and designers of fixed immersion heaters and water‑heating elements
• Product compliance and safety engineers preparing conformity documentation
• Test laboratories and certification bodies performing safety evaluations
• Installers, OEMs and specifiers procuring immersion heaters for domestic and similar water‑heating systems
• Regulators and procurement teams ensuring appliances meet harmonized EU safety requirements

Related Standards

• EN 60335-1 (General requirements for household and similar electrical appliances) - essential companion document
• Other EN 60335‑2‑xx parts that provide particular requirements for different appliance types

Using EN 60335-2-73 helps ensure immersion heaters meet recognized safety, performance, and compliance expectations for domestic water‑heating equipment. Keywords: EN 60335-2-73, fixed immersion heaters, household appliance safety, water heating equipment, electrical safety standard.