Gluhwein (or more correctly, Glühwein), is the same as mulled wine, there is no real difference. Mulled wine is the British term for the German 'Glühwein', and the same drink is also known as vin chaud in France and in the Nordic countries, Glögg. There are several variations of the drink all over Europe, although the basic recipe (red wine + whole spices + citrus) remains the same.