Our indirect heaters immerse the firebox and process coil in various intermediate media (e.g. water, molten salt, glycol, heat transfer oil). This prevents the contact between the flame or combustion product and the process coil that is normally associated with direct-fired heaters and instead, relies on convection as its primary heat transfer mechanism. Thus, the process fluid is heated without any concern of scaling or thermal degradation. Crescent Indirect heaters are available from 0.1 to 50 MM Btu/Hr.