CAN CSA E60335-2-61-11 (2016): Safety of Thermal Storage Room Heaters — Scope, Requirements, and Compliance

Introduction

CAN CSA E60335-2-61-11 (2016) is the Canadian adoption of the international standard IEC 60335-2-61, which specifies safety requirements for electric thermal storage room heaters intended for household and similar purposes. Published by the Canadian Standards Association (CSA Group), this standard addresses the unique operational and climatic conditions in Canada while maintaining alignment with global safety principles. Compliance with this standard is essential for manufacturers seeking CSA certification and market access in Canada. This article provides an in‑depth overview of the scope, technical requirements, implementation highlights, and compliance notes for this important safety standard.

Scope

The standard applies to electric thermal storage room heaters that accumulate heat during charging periods (e.g., off‑peak hours) and release it gradually. These appliances are intended for indoor use in dwellings and similar premises. Key points of the scope include:

• Rated voltage: not exceeding 250 V for single‑phase appliances and 480 V for other appliances.
• Rated input: typically up to 20 kW, covering most residential and light commercial applications.
• Construction types: includes both controlled (fan‑assisted) and uncontrolled (natural convection) heaters, with built‑in charging controls and thermal insulation.
• Exclusions: heaters designed exclusively for industrial purposes, appliances using combustion or liquid fuels, and central heating systems are not covered.

Technical Requirements

2.1 General Safety Principles

The standard follows the IEC 60335 series approach to protection against electric shock, mechanical hazards, fire, and excessive temperatures. All components must operate reliably under normal and abnormal conditions.

2.2 Construction and Components

• Heating elements: must be enclosed, protected from direct contact, and designed to withstand thermal cycling without degradation.
• Thermal insulation: non‑combustible materials (e.g., mineral wool, ceramic fiber) with adequate fire‑resistance shall be used. Insulation thickness must limit surface temperatures to safe levels.
• Controls: thermostats, timers, and charging controllers must be fail‑safe. A thermal cut‑out (non‑self‑resetting) is required to interrupt power if the storage core overheats.
• Enclosures: metallic enclosures must be earthed; non‑metallic enclosures must meet flammability requirements (HB or V‑class per CSA C22.2 No. 0.17).

2.3 Temperature Rise Limits

Surface temperature limits are defined to prevent burns and fire hazards. The table below lists maximum permissible temperature rises above ambient (25 °C) for various parts:

Note: These values apply under normal operation at maximum input. Reductions may apply for small-area surfaces or those made of non‑metallic, low‑thermal‑conductivity materials.

2.4 Charging Control and Overheat Protection

The heater must automatically stop charging when the storage core reaches its designed temperature. At least two independent thermal protection devices are required: one resettable thermostat and one non‑self‑resetting thermal cut‑out. The cut‑out must operate before the appliance reaches unsafe temperatures.

2.5 Mechanical Strength

Enclosures and internal supports must withstand handling and installation forces. A drop test (from 10 cm onto a concrete surface) and a steady‑force test (250 N applied to the largest panel) must not cause deformation that reduces clearances or exposes live parts.

Implementation Highlights

Implementation of CAN CSA E60335-2-61-11 in product design and testing involves several practical considerations:

• Canadian deviations: The CSA version includes modifications to reflect Canada’s 60 Hz supply, colder ambient test conditions (10 °C instead of 20 °C for some tests), and stricter requirements for cord anchorage and grounding.
• Environmental conditions: Heaters must operate reliably in Canadian winter conditions, including cold draft environments; testing covers temperatures as low as 5 °C.
• Energy consumption: While the standard focuses on safety, efficiency considerations (e.g., standby power) are increasingly integrated via related CSA standards and regulations.
• CE Code compliance: The standard is referenced by the CE Code for field installation, meaning heaters must also satisfy Part I requirements for overcurrent protection, disconnect means, and wiring methods.

Compliance Notes

To demonstrate conformity to CAN CSA E60335-2-61-11, manufacturers must engage a recognized certification body (e.g., CSA Group, Intertek, UL) for testing and periodic factory inspections. Key aspects of the compliance process include:

• Type testing: complete appliance tested for all safety parameters, including leakage current, dielectric strength, abnormal operation, and endurance of controls.
• Marking and instructions: The appliance shall be marked with rated voltage, power input, and the CSA certification mark. Instructions must specify charging periods, clearance distances (min. 100 mm to walls/ceilings), and warning not to cover the heater.
• Production inspection: Routine tests (e.g., earth continuity, dielectric strength) on every unit manufactured are required.
• Documentation: Technical files containing design drawings, component ratings, and test reports must be maintained for the duration of certification.

Frequently Asked Questions

Last updated: 2026