The Heater Treater from Bliss Europe is a vital oilfield processing unit designed to separate crude oil from associated water and gas while simultaneously reducing the viscosity of heavy crude through controlled heating. This multi-phase separator utilizes a fire tube heating system in combination with gravitational separation to enhance the efficiency and speed of oil treatment at well sites and production facilities. Designed for use in both 2-phase and 3-phase separation, the system can be tailored for emulsion breaking, dehydration, and degassing applications. It integrates inlet diffusers, weirs, mist extractors, fire tubes, level controls, and pressure safety systems, all packaged within a robust horizontal or vertical ASME-coded vessel. Built to handle varying flow rates and compositions, the Bliss Heater Treater ensures stable and efficient operation even in challenging field environments.