Heaters-Unit-Dealers (Wholesale) is a subdivision of the Warm Air Heating and Air-Conditioning Equipment and Supplies (Wholesale) industry. Companies in this industry are involved in the wholesale distribution of heating units, including furnaces, boilers, and space heaters. These companies typically purchase heating units from manufacturers and sell them to retailers, contractors, and other businesses. Heaters-Unit-Dealers (Wholesale) companies may also offer installation services for the heating units they sell, as well as maintenance and repair services. They may work with a variety of heating unit types, including gas, electric, and oil-fired units.