You're right, there is no minimum warranty period in the EU or Poland, I've did some reaserch ;P
But then again, the EU constructed a directive obliging manufacturers to give consumers a 2 year Warranty, so how does this go against what you're saying?
That directive is 1999/44/EC. Check how it has been adopted in Poland and look carefully for the loopholes.
For instance, in the UK if any defect is detected within 6 months of purchase you can return the item to the seller and ask for redress. After 6 months, you have to prove the fault was there at the time of purchase. The EU directive gives you up to 2 years from purchase to raise a complaint (non-conformity), but essentially, after 6 months, you would probably have to sue in court if the seller refuses to accept liability. With a formal warranty, the seller would have to prove you were at fault. Retail/Manufacturer warranties are worth having regardless of the law. They save time and bother.
The Czech republic, for example, has a formal two year warranty and you might want to look at page two under the heading Your rights when you are in another EU country to see the difference between what the EU directive provides for and what local Czech law requires.
http://www.coi.cz/files/documents/how-to-claim-goods-bought-in-the-eu.pdf
