Real flames with rusty finish Inspired by works of Gustav Klimt, Planika created Gustav Commerce an outdoor fireplace ideal for hotels and restaurants. Gustav Commerce is a portable, outdoor fireplace made out of Corten steel giving it a rusty-like appearance. The commerce burner technology ensures that the fuel will never spill out of the fireplace, even if its pushed or knocked over. As Gustav Commerce needs no hard connections, it will be a perfect ethanol fireplace for commercial areas.