Hot Oil System

Hot Oil System
  • Heat Transfer Fluids to 600°F (315°C) or 650°F (343°C)
  • 50 - 500 kW
  • 240, 480 and 600 V, 3 Phase, 60 Hz
  • Compact Footprint for Installation
  • Non-Pressurized (Atmospheric) Operation
  • 150# Carbon Steel Construction
  • Long Life 0.475 (12.1 mm) dia. Steel Sheath Heating Elements
  • High Temperature Centrifugal Pump - Rated to 650°F (343°C)
  • Electronic Digital Temperature and Process Control
  • Discharge Pressure Gauge
  • UL NEMA 12 Electrical Enclosure complete with Contactors, Temperature Safety Limit, Transformers, and Pilot Lights
  • 650°F (343°C) Operation (Optional)
  • External Cold Expansion Tank (Optional)
  • External Heat Exchanger (Optional)

Chromalox MOS Mid-Size Hot Oil System is engineered to operate to 600°F (315°C) standard, with an option for up to 650°F (343°C), at atmospheric pressure (non-pressurized). Its electric heating core assures responsive and precise temperature control in a space saving package. The system can be used with most types of heat transfer oils such as Paratherm®, Mobiletherm®, Therminol®, Dow Brands®, etc. The MOS operates in a closed loop system using a cold expansion tank (optional). A cold expansion tank can remove the need for a nitrogen (N2) purge and reduces the degredation of heat transfer fluids.


The Chromalox MOS system is great for applications such as reactors, evaporators, dryers, platen presses, heat exchangers, extraction, distillation columns,  roll heating, or any jacketed kettles / vessels / tanks. Hot oil systems can be used in a variety of industries such as chemical, plastics, cosmetics, automotive, rubber, refining, pharmaceutical, non-woven / textiles/ fibers, aerospace, or any other industrial market.


Chromalox MOS systems are ruggedly constructed for industrial applications. The heavy-duty, steel support base features channel grooves for forklift transport. The heater chamber is fully welded and houses only Chromalox brand, long-lasting heating elements. The panel is UL-listed and assembled in-house. The pump is air-cooled with a mechanical seal, rated to 650°F (343°C). The final assembly is fully-shop tested prior to shipment.

  • Electronic Process Control
  • Element Overtemperature Protection
  • Air-Cooled Mechanical Seal
  • Insulated Heating Chamber
  • Discharge Pressure Gauge
  • Compact Footprint
  • Fully Pre-wired & Tested
  • Centrifugal Pump
  • Temperature rating to 600°F (315°C)
  • 150# ANSI Flange Connection
  • Start / Stop buttons with Motor Starter
  • Pilot Lights for Power, Heater, & Pump


  • Precise process control
  • Protect elements and fluid from overheating
  • No external cooling needed
  • Maximize efficiency by minimizing heat loss
  • Confirm pump operating performance
  • Space saving design
  • Ready to operate on site
  • Minimize piping configuration
  • Covers most applications
  • Easy fit up to installed piping
  • Complete operating system
  • Visual indication of system operation


  • 650°F (343°C) Operation
  • Electronic Solid State (SCR) Power Control
  • Strainer
  • Powder Coated or Stainless Steel Side Coverings
  • Dedicated Fill Connection
  • NEMA 4 or 4X (Stainless) Construction
  • Class 1, Div 2 Hazardous Area Rating (with purge)
  • Panel Disconnect Switch
  • Heater On/Off Switch
  • Suction Pressure Guage
  • Inlet / Outlet 150# Gate Valves
  • Drain / Bleed Values
  • Digital Overtemperature Controller
  • ASME Design & Certified, Section VIII, for 100 psi at 600/650°F (7 bar at 315/343°C)
  • High Flow Pump (300 GPM, 350-500 kW units only)
  • Heat Exchanger (shipped loose for customer installation)
  • Expansion Tank (shipped loose for customer installation)
  • Liquid Level Switch for Expansion Tank

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