Product Introduction

Inline / Circulation Heaters

Inline & Circulation Heaters: High-Efficiency Forced-Flow Thermal Systems

Circulation Heaters (or “Inline” Heaters) are all-in-one heating units consisting of a flanged or screw-plug immersion heater mounted inside a pressure-rated insulated metallic chamber. Designed to heat a flowing medium, these units take in cold fluid at the inlet, pass it over high-density heating elements, and discharge it at the desired temperature from the outlet. They are the primary choice for “closed-loop” heating where precise temperature control and high pressure are required.
We can match the inlet/outlet flange sizes of your existing piping to ensure a seamless “drop-in” replacement.
Technical Specs Range / Typical Values
Voltage 220V / 380V / 440V / 480V
Power 3kW – 500kW+
Pressure Rating Up to 1500 PSI (Customizable)
Materials SUS304, 316L, Carbon Steel

Minimal Heat Loss: Each chamber is wrapped in high-grade industrial insulation and housed in a protective steel jacket, ensuring that nearly 100% of the electrical energy is transferred to the process fluid.

 

Rapid Response: Because the fluid is forced across the elements, heat transfer is significantly faster than in stagnant tank heating, allowing for precise real-time temperature adjustments.

 

Integrated Flow Management: Often equipped with internal baffles that direct the fluid in a serpentine path, maximizing contact time with the heating elements and eliminating “cold spots.”

 

Space-Saving Vertical or Horizontal Mounting: Their compact, “plug-and-play” design allows them to be integrated into existing piping systems without the need for large storage tanks.

 

Feature Liquid Circulation (Water/Oil) Gas/Air Circulation
Chamber Material Carbon Steel or 304/316 SS High-Temp Stainless Steel or Incoloy®
Pressure Ratings 150lb, 300lb, up to 3000 PSI Variable based on flow velocity
Heating Elements Copper, Steel, or Incoloy® Incoloy® or Inconel® (high-temp)
Temperature Control Thermocouple / RTD at Outlet Dual-sensor (Sheath + Outlet)

Process Water Heating: Instantaneous hot water for industrial cleaning, laundry, or boiler feed-water preheating.

 

Oil & Viscosity Control: Heating fuel oils, hydraulic oils, and heat transfer fluids (HTFs) in closed-loop systems.

 

Steam Superheating: Raising the temperature of saturated steam for power generation or sterilization.

 

Gas Processing: Heating nitrogen, hydrogen, or compressed air for industrial drying or chemical reactions.

 

Deionized Water: Specialized stainless steel units for high-purity water in labs and semiconductor plants.

Integrated Heating Equipment

High-Performance Industrial Heating Systems & Integrated Solutions

For critical industrial processes, a heating element is only as good as its durability and control. At Runkel, we specialize in high-spec thermal engineering. From high-vacuum environments to hazardous explosion-proof zones, we provide fully customized heaters integrated with bespoke Control Cabinets for a true “plug-and-play” experience.

The Total Solution: Integrated Control Cabinets. We don’t just provide the heat; we provide the brain. To ensure your heating system operates safely and accurately, we offer Custom-Built Control Cabinets tailored to your specific heater:Precise Control: PID or PLC-based systems for temperature accuracy within $\pm 1$°C.Safety First: Integrated over-temperature protection, leakage circuit breakers, and emergency stops.User Interface: Digital displays, HMI touchscreens, or remote monitoring capabilities.Custom Voltage: Built to match your local industrial power standards (e.g., 220V, 380V, 440V, or 480V).

Why Partner With Us for High-Spec Needs?

“Complex Requirements, Simple Execution.”

Direct Replacement of Legacy Parts:

If your imported equipment has a failed flanged heater or a specialized vacuum element that is too expensive or slow to source from the OEM, we can reverse-engineer and manufacture a replacement that meets or exceeds the original specs.

Material Excellence:

We select materials based on your environment—whether it’s Incoloy 800 for high-temperature oxidation or Pure PTFE for chemical longevity.

Start Your Custom Build Today

Whether you need a replacement Defrost Heater for a cold storage unit or a complete Explosion-Proof Circulation System with a control panel, we are ready to assist.