Portable electric heaters can be moved wherever extra heat is desired by carrying or rolling on included wheels or carts. They supplement heat from central heating systems or provide comfort heating. Office heaters are typically used at desks or reception areas for personal heating. Jobsite and garage heaters are more powerful than office heaters to heat cold work areas. Hazardous-location heaters provide heat in environments where flammable gases, vapors, powdered metals, or dust are present.