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Watlow
Watlow WATROD Multicoil Tubular Heater
Quote on request
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Multi-coil tubular; to 1600 °F sheath; internal TC. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Internal TC senses heater temperature for control/protection (application-specific)
Output
Electric tubular heater; single-phase or three-phase multi-coil configurations
Supply
Dual-voltage and three-phase capability via multiple coil designs (application-specific)
Process connection
Formable tubular element; diameters 0.375, 0.430, 0.475, 0.490 in depending on option
Ambient temperature
Application-dependent; moisture seal and lead ratings limit environment
Approvals
Agency certifications per Watlow catalog options
Fits tubular heating where you need a Watlow WATROD Multicoil with multiple resistance coils in one sheath, optional internal thermocouple, and sheath temperatures up to 1600 °F (870 °C).
Key advantages
- Watt density — Up to 60 W/in² (9.3 W/cm²)
- Temperature — Sheath up to 1600 °F (870 °C); 304/316 SS to 1200 °F (650 °C)
- Sensing — Patented internal thermocouple with resistance coils in one sheath
- Electrical — Single- or three-phase multi-coil; dual-voltage designs
- Sheath — Alloy 600/800/840, 304 SS, 316 SS; formable diameters
Typical applications
- Process air and radiant tubular heating.
- Three-phase in a single sheath.
- Applications needing internal TC without external tip contamination.
Selection guide
- Sheath alloy / OD — Process chemistry and T
- Coils — Single vs multi; voltage/phase
- Length — Up to 237 in; >120 in factory review
- Seals / leads — Epoxy/Lavacone and Sil-a-Blend/GGS ratings
Common mistakes
- Ignoring moisture seal temperature limits.
- Ordering >120 in without factory review.
- Wrong sheath alloy for process chemistry.
When to RFQ / what to tell us
- Process T/media; OD/length; V/phase.
- Internal TC yes/no; sheath alloy.
- Quantity and ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 21700 |
| Brand | Watlow |
| Model | Watlow WATROD Multicoil Tubular Heater |
| Product type | Tubular Heater |
| Watt density | Up to 60 W/in² (9.3 W/cm²) |
| Process temperature | Sheath temperatures up to 1600 °F (870 °C); 304/316 SS sheath up to 1200 °F (650 °C) |
| Sensor | Patented internal thermocouple packaged with one or more resistance coils in one sheath |
| Electrical | Electric tubular heater; single-phase or three-phase multi-coil configurations |
| Supply | Dual-voltage and three-phase capability via multiple coil designs (application-specific) |
| Sheath materials | Sheath materials Alloy 600, 800, 840, 304 SS, 316 SS |
| Diameters | Formable tubular element; diameters 0.375, 0.430, 0.475, 0.490 in depending on option |
| Max length | Up to 237 in (6020 mm); designs >120 in require factory review |
| Termination | Lead wires Sil-a-Blend 392 °F (200 °C) or GGS 482 °F (250 °C) |
| Moisture seals | Epoxy to 356 °F (180 °C) or Lavacone to 221 °F (105 °C) |
| Features | Three-phase in one sheath; multi-coil dual voltage; internal TC eliminates external sensing tip contamination |
Documents
- Watlow WATROD Multicoil documentation — request current OEM PDF on RFQ — request current OEM PDF on RFQ
FAQ
Q: Max sheath temperature? A: Up to 1600 °F (870 °C) depending on alloy.
Q: Internal TC? A: Yes — patented internal thermocouple packages.
Q: What should I send for a quote? A: Media/T, OD/L, V/phase, alloy, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Internal TC senses heater temperature for control/protection (application-specific) |
| Output | Electric tubular heater; single-phase or three-phase multi-coil configurations |
| Supply | Dual-voltage and three-phase capability via multiple coil designs (application-specific) |
| Process connection | Formable tubular element; diameters 0.375, 0.430, 0.475, 0.490 in depending on option |
| Ambient temperature | Application-dependent; moisture seal and lead ratings limit environment |
| Approvals | Agency certifications per Watlow catalog options |
| Sensor type | Patented internal thermocouple packaged with one or more resistance coils in one sheath |
| Watt Density | Up to 60 W/in² (9.3 W/cm²) |
| Process Temperature | Sheath temperatures up to 1600 °F (870 °C); 304/316 SS sheath up to 1200 °F (650 °C) |
| Enclosure Material | Sheath materials Alloy 600, 800, 840, 304 SS, 316 SS |
| Max Trim Length | Up to 237 in (6020 mm); designs >120 in require factory review |
| Termination | Lead wires Sil-a-Blend 392 °F (200 °C) or GGS 482 °F (250 °C) |
| Moisture Seals | Epoxy to 356 °F (180 °C) or Lavacone to 221 °F (105 °C) |
| Special Features | Three-phase in one sheath; multi-coil dual voltage; internal TC eliminates external sensing tip contamination |