What requirement must be met for gas appliances regarding identification?

Gas appliances are required to bear the manufacturer's identification to ensure traceability and accountability. This requirement is crucial because it allows for proper identification of the product, making it easier for regulators, service technicians, and consumers to verify the appliance's compliance with safety standards. The manufacturer's identification can help determine the product's warranty, recall status, and available technical support.

Having proper identification also aids in the maintenance and servicing of the appliance, as technicians can refer to manufacturer specifications and guidelines when performing repairs or inspections. This ensures that the appliance operates safely and efficiently, reducing the risk of accidents associated with gas appliances.

While safety warning labels, operation manuals, and color-coding may also be beneficial for various reasons, the key requirement directly linked to accountability and compliance in this context is the manufacturer's identification.