Waste-oil furnaces-sales and services (wholesale) is an industry that involves the selling and servicing of furnaces that are specifically designed to burn waste oil. These furnaces are used in a variety of settings, including automotive repair shops, industrial facilities, and commercial buildings. The primary purpose of these furnaces is to provide a cost-effective and environmentally friendly way to dispose of waste oil while also providing heat for the building. The industry is highly specialized and requires a deep understanding of the technology and regulations surrounding waste oil disposal.