Circulation heaters provide a ready-made means to install electric heating with a minimal amount of time and labor. This is accomplished by combining heating elements, vessel, insulation, terminal enclosure, mounting brackets and inlet and outlet connections into a complete assembly.
Made from NPT screw plug or ANSI flange heater assemblies mated with a pressure vessel (tank), circulation heaters are designed to heat forced-circulation air, gases or liquids. Ideal for either in-line or side-arm operations, these assemblies direct fluids past FIREBAR® or WATROD™ heating elements, to deliver fast response and even heat distribution.
Watlow® meets virtually all your circulation heater assembly needs with made-to-order units. These units can be made from a wide range of heating element sheath materials, wattages, vessel sizes and materials, pressure ratings, terminal enclosures and controls.
Specifications:
| Material | Maximum Operating Temperatures | Maximum Watt Densities | ||
|---|---|---|---|---|
| °F | °C | W/in2 | W/cm2 | |
| Alloy 800/840 | 1600 | 870 | 120 | 18.6 |
| 316 Stainless steel | 1200 | 650 | 120 | 18.6 |
| Steel | 750 | 400 | 120 | 18.6 |
| N/A | 350 | 175 | 120 | 18.6 |
- Watt densities to 120 W/in² (18.6 W/cm²)
- Wattages to three megawatts
- UL® and CSA component recognition to 690VAC
- Ratings to ANSI Class 600 pressure class
- Alloy 800/840 sheath temperatures to 1600°F (870°C)
- Passivated 316 stainless steel sheath temperatures to 1200°F (650°C)
- Steel sheath temperatures to 750°F (400°C)
Applications:
- Deionized
- Demineralized
- Clean
- Potable
- Process
- Industrial water rinse tanks
- Hydraulic oil, crude, asphalt
- Lubricating oils at API specified watt densities
- Heat transfer oil
- Paraffin
- Caustic cleaners
- Nitrogen, hydrogen and other air/gas systems
- Superheating steam
Features & Benefits:
| Features | Benefits |
|---|---|
| Catalog screw plug and flange part numbers |
|
| ANSI B16.5 Class 150 on 4 or 6 inch FIREBAR element flanges and 3 to 14 inch WATROD element flanges |
|
| FIREBAR assemblies pack more wattage in a smaller heater bundle |
|
| Compacted MgO insulation filled elements |
|
| 1 inch (25 mm) thermal insulation rated to 750°F (400°C) |
|
| Heavy-guage steel jacket (shroud) |
|
| All catalog units rated to ANSI pressure Class 150 |
|
| Standard offering includes units rated for up to and including ANSI pressure class 600 (application review required) |
|
| Circulation Heaters |
| HYDROSAFE™ Indirect Heat Exchanger |
| Modular Duct Heater |
| STARFLOW Circulation Heaters |
| Watlow Process Solutions |
| FIREBAR Circulation Heater Installation & Maintenance Manual |
| ISO 9001:2008 (2013-2016) Hannibal |
| PED Module H1 Certificate |
| Heater Catalog (Section) – Agency Certifications |
| Heater Catalog (Section) – Circulation Heaters |
| Heater Catalog (Section) – Heater Reference Data |
| Heater Catalog (Complete – .pdf) |
