Most if not all appliances have a serial number. It’s a unique code of letters or numbers, or both, that is added to the appliance when it’s manufactured. It helps the producer to track a product for quality control, indicating the model of the appliance, when it was made, and various other details. We often require the serial number to insure an appliance, such as a boiler.
A lady called me a few days ago and offered me the serial number for her boiler. I was expecting to be asked for the model of her boiler, or whether parts were still available. But no. She gave me the serial number expecting me to tell her where the boiler was installed!
As if the manufacture would know where each boiler was going to be installed before they actually sold it. Now that would be something.