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Watlow
Watlow Circulation Heater
Quote on request
No online payment · add lines to RFQ BOM
WATROD/FIREBAR circulation assembly; vessel + elements. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Circulation heater assemblies for liquid/gas process heating; ratings application-specific per HAN-CIR-0719
Accuracy
N/A (heater assembly)
Output
N/A (heating assembly; optional thermostats)
Supply
Configured per order (see Watlow circulation heater electrical section)
Protection
Enclosure options including Enclosure 4 class packages (literature)
Ambient temperature
Per vessel/sheath material and process design
Fits forced-circulation fluid or gas heating where you need a Watlow circulation heater assembly combining screw-plug or flange heaters with an insulated vessel and terminal enclosure.
Key advantages
- Type — WATROD/FIREBAR circulation heater (heater + vessel assembly)
- Duty — Forced-circulation heating of air, gases, or liquids
- Construction — Elements, vessel, insulation, enclosure, inlet/outlet
- Pressure — Typical ANSI Class 150; higher classes on review
- Recognition — UL/CSA component recognition packages per catalog
Typical applications
- In-line process fluid heating.
- Side-arm tank circulation loops.
- Gas and air preheat packages.
Selection guide
- Media — Liquid vs gas; chemistry
- kW / voltage / phase — Heat duty
- Flange / screw-plug — Connection class
- Materials — Sheath and vessel package
Common mistakes
- Undersizing flow so elements see film boiling.
- Ignoring pressure class vs system rating.
- Wrong sheath material for chemistry.
When to RFQ / what to tell us
- Media, flow, T in/out, P.
- kW/V/phase; materials; connection.
- Quantity and ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 21707 |
| Brand | Watlow |
| Model | Circulation Heater |
| Product type | Circulation Heater |
| Type | Watlow WATROD/FIREBAR circulation heater assembly (screw-plug or flange heater + vessel) |
| Construction | Heating elements, vessel, insulation, terminal enclosure, mounting and inlet/outlet as a complete assembly |
| Duty | Forced-circulation heating of air, gases or liquids; in-line or side-arm |
| Materials | Multiple sheath and vessel material packages (steel / stainless / alloy options) |
| Pressure | Catalog units typically ANSI Class 150; higher pressure classes available on review |
| Insulation | About 1 in thermal insulation with protective jacket/shroud |
| Recognition | UL/CSA component recognition packages per catalog |
Documents
- Watlow circulation heater documentation — request current OEM PDF on RFQ — request current OEM PDF on RFQ
FAQ
Q: What is included? A: Heating elements, vessel, insulation, enclosure, mounting, inlet/outlet as an assembly.
Q: Pressure class? A: Catalog units typically ANSI Class 150; higher on review.
Q: What should I send for a quote? A: Media/flow/T/P, kW, materials, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Circulation heater assemblies for liquid/gas process heating; ratings application-specific per HAN-CIR-0719 |
| Accuracy | N/A (heater assembly) |
| Output | N/A (heating assembly; optional thermostats) |
| Supply | Configured per order (see Watlow circulation heater electrical section) |
| Protection | Enclosure options including Enclosure 4 class packages (literature) |
| Ambient temperature | Per vessel/sheath material and process design |
| Approvals | CSA (file/options per literature) |
| Mounting | Flanged / inline circulation heater vessel assemblies |
| Sensor type | Optional thermostats / sensors |
| Notes | Watlow circulation heaters using WATROD elements for process fluid heating. Specs from HAN-CIR-0719 specification sheet. |
| Element Type | WATROD flange / circulation heater constructions |
| Sheath Materials | Multiple sheath materials available on WATROD circulation constructions |