What is BS EN 60335-2-21?

BS EN 60335-2-21 is a technical standard that specifically focuses on the safety requirements for electrically operated storage water heaters. It is an essential guideline designed to ensure the safe operation of these appliances and protect both users and installers from potential hazards. The standard covers various aspects, including electrical safety, mechanical construction, and performance criteria, which together contribute to the safe and efficient functioning of such devices.

Electrical Safety

One of the primary concerns addressed by BS EN 60335-2-21 is electrical safety. This standard sets out specific requirements and tests for electric storage water heaters to ensure they are safe to use. For example, it dictates that the devices must be constructed in a way that minimizes the risk of electric shock or fire due to faulty wiring. Additionally, the standard mandates proper grounding and insulation to prevent any leakage of electric current, thereby safeguarding users and preventing potential accidents.

Mechanical Construction

The mechanical construction of electric storage water heaters is also covered extensively in BS EN 60335-2-21. This includes requirements for the materials used, the structural design, and the pressure resistance capabilities of these appliances. The standard aims to ensure that the water heaters are built with durable and reliable components, capable of withstanding internal and external pressures without any compromise to their integrity. By adhering to these construction guidelines, manufacturers can ensure the longevity and dependability of their products.

Performance Criteria

Apart from safety considerations, BS EN 60335-2-21 also sets performance criteria for electric storage water heaters. These criteria address factors such as energy efficiency, heat transfer efficiency, and water flow rates. The standard specifies the maximum allowable heat loss, the minimum energy efficiency ratio, and the required hot water delivery rates for different heater types. By establishing these performance benchmarks, the standard aims to optimize the overall performance of electric storage water heaters while minimizing energy waste.