Heated fluid flows directly inside furnace tubes and is heated by flame radiation and convection from high-temperature flue gas. Equipped with fully automatic burners and load adjustment. Unattended 24/7 operation. Finite element analysis design with mature anti-dew-point corrosion technology. Thermal Efficiency: ≥90% (max 92%) Tube Design Pressure: 1.6–6.4 MPa (max 10 MPa) Heated Media: Water, water-containing crude, commodity crude, etc. Fluid Temperature Rise: 20°C–60°C (crude max outlet 85°C) Max Single-unit Flow: ≤600 m³/h Pressure Drop: ≤0.2 MPa Main Applications: Long-distance pipelines, oilfield surface facilities, international pipeline projects