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Watlow
Watlow Screw Plug Immersion Heater
Quote on request
No online payment · add lines to RFQ BOM
NPT screw-plug immersion; WATROD/FIREBAR; to ~38 kW. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Direct-immersion screw-plug heaters; sheath/process ratings application-specific per HAN-SSPI-0519
Accuracy
N/A (heater assembly)
Output
N/A (heating assembly; optional thermostats/thermocouples/thermowells)
Supply
Configured per order; wattages up to ~38 kW class per screw-plug specification sheet
Protection
Optional terminal enclosures (moisture-resistant / certified classes per literature)
Ambient temperature
Per sheath material and process design
Fits threaded tank immersion heating where you need a Watlow screw-plug heater with WATROD or FIREBAR elements on 1 to 2½ in NPT plugs and wattages up to about 38 kW.
Key advantages
- Elements — WATROD and FIREBAR on NPT screw plugs
- Mounting — NPT screw plugs typically 1 to 2½ in (HAN-SSPI-0519)
- Watt density — Up to 120 W/in² class
- Wattage — Configured up to ~38 kW class
- Options — Thermostats, thermowells, thermocouples; enclosure classes
Typical applications
- Small-to-medium tank heating.
- Side-arm and circulation heater element packages.
- OEM equipment with threaded heater ports.
Selection guide
- Plug size — 1–2½ in NPT vs tank coupling
- Element — WATROD vs FIREBAR
- kW / V — Heat duty
- Sensors / enclosure — Control and environment
Common mistakes
- Wrong NPT size.
- Oversizing kW for tank turnover.
- Dry-fire without liquid cover.
When to RFQ / what to tell us
- Fluid, T, NPT size.
- kW/V; element; sensors; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 21711 |
| Brand | Watlow |
| Model | Watlow Screw Plug Immersion Heater |
| Product type | Immersion Heater |
| Description | Direct-immersion screw-plug heaters; sheath/process ratings application-specific per HAN-SSPI-0519 |
| Supply / wattage | Configured per order; wattages up to ~38 kW class per screw-plug specification sheet |
| Watt density | Up to 120 W/in² class (per HAN-SSPI-0519) |
| Element type | WATROD and FIREBAR elements on NPT screw plugs |
| Sheath materials | Multiple Watlow immersion sheath options |
| Sensors | Optional thermostats, thermowells, thermocouples |
| Enclosure | Optional terminal enclosures (moisture-resistant / certified classes per literature) |
| Mounting | NPT screw plug sizes typically 1 to 2½ in per HAN-SSPI-0519 |
| Notes | Watlow standard screw plug immersion heaters (HAN-SSPI-0519). Specs from watlow.com screw-plug immersion heaters specification sheet. |
Documents
- Watlow screw plug immersion documentation — request current OEM PDF on RFQ — request current OEM PDF on RFQ
FAQ
Q: Plug sizes? A: Typically 1 to 2½ in NPT per HAN-SSPI-0519.
Q: Element types? A: WATROD and FIREBAR.
Q: What should I send for a quote? A: Fluid/T, NPT, kW, materials, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Direct-immersion screw-plug heaters; sheath/process ratings application-specific per HAN-SSPI-0519 |
| Accuracy | N/A (heater assembly) |
| Output | N/A (heating assembly; optional thermostats/thermocouples/thermowells) |
| Supply | Configured per order; wattages up to ~38 kW class per screw-plug specification sheet |
| Protection | Optional terminal enclosures (moisture-resistant / certified classes per literature) |
| Ambient temperature | Per sheath material and process design |
| Mounting | NPT screw plug sizes typically 1 to 2½ in per HAN-SSPI-0519 |
| Sensor type | Optional thermostats, thermowells, thermocouples |
| Notes | Watlow standard screw plug immersion heaters (HAN-SSPI-0519). Specs from watlow.com screw-plug immersion heaters specification sheet. |
| Watt Density | Up to 120 W/in² class (per HAN-SSPI-0519) |
| Element Type | WATROD and FIREBAR elements on NPT screw plugs |
| Sheath Materials | Multiple Watlow immersion sheath options |