Skip to content 
Circulation Heaters
Customizable
Product Catalog
Efficient, configurable inline heating for liquids and gases
elekheat circulation heaters deliver rapid, controlled heat to a flowing process stream with a compact footprint, high efficiency, and precise temperature control. Configurable power, materials, enclosures, and controls to fit your application.
- ASME/PED Vessel
- ATEX/IECEx/NEC
- NEMA 1/4/4X/7/9
High efficiency, small footprint
Inline design minimizes heat loss and floor space with near‑zero standby losses.
Process‑tight control
Pair with SCR/PID panels and precision RTDs for ±1–2 °C stability (application‑dependent).
Serviceable by design
Removable heater bundle for fast maintenance; spare bundles available.
Related Products
Water circulation heater
Inline electric vessel heats flowing water with precise PID control.
Oil circulation heater
Skid-mounted electric heater for high-viscosity oils; controlled, uniform heating.
Air circulation heater
Electric duct heater warms air streams for drying, curing, or process heating.
Heater control panel
Integrated PID/SCR panel with safeties; manages power, alarms, and interlocks.
Heater accessories
Pumps, valves, flow switches, sensors, insulation, mounting hardware.
Circulation heater structure diagram
Quick Specs
- Power: 3–1,000 kW standard (higher on request)
- Voltage: 208–690 V, 50/60 Hz, 1Ø/3Ø
- Max temp: Up to 400 °C / 750 °F (fluid‑dependent)
- Pressure classes: ASME/EN vessels; Class 150/300 typical
- Materials: CS, 304/316L, high‑nickel alloys
- Enclosures: NEMA 1/4/4X/7/9; ATEX/IECEx options
- Controls: Thermostats, RTD/TC, SCR/PID, high‑limit safeties
Applications
Technical Specifications
| Parameter | Range / Options |
|---|---|
| Power | 3–1,000 kW standard; up to 2 MW engineered |
| Voltage | 208–690 V, 50/60 Hz, 1Ø/3Ø |
| Temperature range | Ambient to 400 °C (fluid‑limited) |
| Pressure class | ASME/EN; common Class 150/300; higher by design |
| Sheath materials | 316L SS, Alloy 800/840, Incoloy®, copper (water only), others |
| Watt density | Matched to media; low W/in² for oils/viscous fluids |
| Sensors | PT100 RTD / Type J/K TC; independent manual‑reset high‑limit |
| Enclosure | NEMA/UL 1, 4/4X, 7/9; ATEX/IECEx options |
| Controls | Contactors or SCR; PID with auto‑tune; HMI on request |
| Ports | Inlet/outlet, vent, drain, DP taps, thermowells; relief boss if specified |
Final ratings depend on fluid, flow, ΔT, and code requirements.
Options & Customization
- Wetted materials: CS, 304/316L, Duplex, Alloy 800/825/840/600/625
- Connections: ANSI/EN flanges, NPT, Tri‑Clamp, custom nozzles
- Enclosures: NEMA 1/4/4X/7/9; ATEX/IECEx hazardous‑area packages
- Controls: Contactors or SCR; PID, multi‑zone, flow/DP interlocks, Modbus/Ethernet
- Instrumentation: Inlet/outlet RTDs, extra thermowells, pressure/DP taps
- Finish & protection: Paint systems, passivation, food‑grade polish, heat tracing
- Compliance & testing: ASME/PED, NDE, certs, FAT, ITP
What’s Included
- Engineered circulation heater (vessel + heater bundle)
- Wiring diagram, P&ID, data sheet, nameplate
- Factory tests: IR, hydrotest (additional tests if specified)
- Optional: control panel, FAT with your PLC/SCADA, spares kit
Selection & sizing guide
1) Gather Process Data
- Fluid and properties (density ρ, specific heat Cp, allowable watt density)
- Flow rate (ṁ) and desired temperature rise (ΔT)
- Inlet temperature, outlet setpoint, pressure limits
- Environment (area classification, washdown), electrical supply
- Materials compatibility and code requirements
2) Calculate Required Power
SI: PkW = (ṁ [kg/s] × Cp [kJ/kg·K] × ΔT [K]) / η
US (liquids): PkW = (GPM × 8.33 × Cp × ΔT × 60) / (3412 × η)
Add 5–15% margin for distribution losses and control headroom.
Example (water)
Goal: Heat 20 GPM from 60 °F → 140 °F (ΔT = 80 °F). Assume Cp ≈ 1, overall efficiency η = 0.95, and add 10% for losses.
Base load = 20 × 8.33 × 80 × 60 / 3412 = 234.4 kW With losses/η = 234.4 × 1.10 / 0.95 ≈ 271 kW Recommend: 275–300 kW (verify ∆P & watt density)
For viscous oils or gas streams, specify lower watt density and confirm velocity to avoid film overheating.
Installation & safety notes
- Install with correct flow direction and use a flow interlock.
- Provide upstream filtration/strainer for particulate fluids.
- For oils/viscous media, preheat gradually and confirm minimum flow.
- Add pressure relief per piping code and process hazard review.
- Ground per electrical code; commission with qualified personnel.
Circulation Heater Overview and Principle
- Fluid and concentration; MSDS if applicable
- Min/nominal/max flow rate; inlet & desired outlet temperature
- Pressure rating & allowable pressure drop
- Power supply (V/Ph/Hz); control philosophy (on/off, SCR, PID)
- Area classification (safe or hazardous; zone/class/division)
- Materials of construction; NDT/compliance requirements (ASME/PED/UL/ATEX/IECEx)
- Connection types/sizes; layout constraints; insulation/cladding
- Documentation & testing (ITP, FAT, certs); shipping & paint specs
- Delivery target & site location
Frequently Asked Questions
Immersion heaters mount in tanks; circulation heaters put the elements inside a piped vessel, heating a continuous flow with tighter control and lower heat loss.
Yes. With an SCR‑controlled panel and proper sensors, a single unit can follow recipes, ramps/soaks, or multiple fixed setpoints.
Every unit uses an independent high‑limit sensor with manual reset. For low‑flow or gas service, add flow switches, DP monitoring, staged power, and conservative watt density.
We supply explosion‑proof or flameproof enclosures and design packages to support ATEX/IECEx/NEC compliance when specified.
Schematic diagram of the structure
Horizontal circulation heater
Vertical circulation heater
Circulation heating skid
Multi-cylinder circulation heater
Explosion proof circulation heater
High temperature circulation heater
Nitrogen heating
Vertical pipe heater, heating compressed nitrogen, inner chamber made of 304 material, 459 degree hose connector, the outlet direction can be adjusted at will, this picture is a customized model for customers.
Hotel Heating
Pipeline heaters are used in hotel heating systems. Cold water enters and hot water exits. They heat up quickly and have high thermal efficiency. They can circulate and heat the water in the pipeline.
Compressed air heating
The duct heater heats the compressed air, with cold air in and hot air out. The outlet is constant temperature and the temperature is adjustable. The power is calculated based on the on-site flow and temperature difference. The flow rate ranges from 1000 to 8000 cubic meters per hour, and the temperature range is adjustable from 0 to 600 degrees.
Have a Question?
At ELEKHEAT, we’re here to provide the answers you need. Whether you’re looking for product information, technical specifications, or need assistance with maintenance, our team of experts is ready to help. Don’t hesitate to reach out—we’re committed to ensuring you get the support you need for the best heating solutions.
