Given their history in the culinary industry, it should come as no surprise to you that German catering equipment is some of the best around. My personal recommendation, though, is to look at brands like Ernst Neumarker GmbH. You can buy this online quite easily, and you should find that the quality of their equipment makes the cost of investment very much worthwhile.
My own view is that German catering equipment from Ernst Neumarker is some of the best in the industry, with good reason. The quality of the manufacturing is excellent, as is the ease of cleaning. If you are looking to cut down on energy costs in catering and also find brands that are easy to clean and to maintain, then you should find what you are looking for with this particular brand. They have never let me down.