No water heating device shall be sold in the Commonwealth unless it has a

No water heating device shall be sold in the Commonwealth unless it has a

• A. Model number
• B. Serial #
• C. Certification label
• D. Warranty period

Answer: (B)

Serial numbers provide a unique identifier for every individual water heating unit, enabling precise traceability through production, distribution, installation, and service. This makes it possible to track recalls, verify which exact unit is in use, and link it to specific warranty and maintenance records. While a model number identifies the product line and a certification label shows safety compliance, they do not uniquely identify each unit in the field, and a warranty period isn’t a sale-condition requirement. That unit-level traceability is why a serial number is the required feature for sale.

Serial numbers provide a unique identifier for every individual water heating unit, enabling precise traceability through production, distribution, installation, and service. This makes it possible to track recalls, verify which exact unit is in use, and link it to specific warranty and maintenance records. While a model number identifies the product line and a certification label shows safety compliance, they do not uniquely identify each unit in the field, and a warranty period isn’t a sale-condition requirement. That unit-level traceability is why a serial number is the required feature for sale.