Siemens ER 70 250 MX gas hob with integrated controls New gas hob with integrated controls in stainless steel. New product family. The product features two newly developed wok gas burners which direct the heat in two different directions. This is particularly suited to “wok cooking”. The stainless steel topsheet is exceptionally flat in form, ideal for the cleaning that gas hobs in particular require. This is the entry level model of a new product family offering outstanding value for money but without compromising feature richness. Design: Frank Rieser, Design department, Siemens Electrogeräte GmbH, Munich