Devices, apparatus, systems and methods of using a portable heating unit that does not use a separate compressor or blower or vacuum. The unit can be attached to an inlet of a piping system or section and be used to dry the interior walls of the piping system or section, and/or heat coatings passing through the piping system or section, etc. The portable heating unit includes a heater attached to an inlet end of a manifold, where the manifold can include alternative inlet end and two outlet ends. The inlet and outlet ends of the manifold can have quick connect fittings that allow similar fittings to be easily mateably attached thereto by rotating the fittings with one another. A quick connect/disconnect air pressure regulator with similar quick connect fitting can be attached to anyone of the inlet and outlet ends of the manifold. A quick connect/disconnect plug or plugs with similar quick connect fitting can close off any of the inlet and outlet ends of the manifold. The portable heating unit can be used with both a separate compressor and blower/filter having vacuum generator. The portable heating unit can also be used with only a compressor. The portable heating unit can also be used with only a vacuum generator.