Wellhead production units were developed in response to producers' requests for a completely integrated and pre-assembled package to provide heating and separating capabilities. These units consist of an indirect heater and a vertical or horizontal separator, mounted on a structural steel skid with interconnecting piping and instrumentation installed, ready for operation. The basic components are standard units; each sized and selected for the customer's needs. The components as well as the complete unit have high salvage value and can be easily adapted for other Redhead applications. In addition, a low-pressure separator can be added to the assembly to provide two-stage separation. Also, the separators can be furnished for three-phase instead of two-phase operation. The unhoused or open units are designed for moderate climates and give efficient operation at a minimum of cost. The enclosed units are designed for cold climates to give efficient operation with freedom from freeze-ups. KW International stocks standard KW International unhoused units with vertical separators in various combinations are shown. Other units are fabricated as required to customers' requirements.