Whereas the legal guarantee is mandatory under EU consumer law, the commercial warranty is a voluntary service offered by the seller or the producer, sometimes even by a third party. It is important to note that a commercial warranty cannot affect the consumer’s rights under the EU legal guarantee. Rather it should upgrade them, for example, by having a longer duration, covering situations not covered by the legal guarantee, or offering additional services such as repair at home.
Read the ECC-Net Report on commercial warranties.