Abstract: An apparatus and method for increasing and regulating temperature, pressure and fluid viscosities of fluid streams found in oil and gas production. Applicant's apparatus regulates and increases fluid temperatures, by and through improved heating apparatus, which may be placed at one or more locations along a wellbore surface flow line, or subsea flow line. The apparatus preferably either heats fluids flowing from the reservoir to the surface, or alternatively, can heat fluids injected from the surface into the reservoir.