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Watlow
Watlow Square Flange Immersion Heater
Quote on request
No online payment · add lines to RFQ BOM
Square-flange immersion; WATROD/FIREBAR elements. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Process/sheath capability class: Alloy 800 square-flange immersion constructions up to 1600 °F (870 °C) per Watlow immersion catalog
Accuracy
N/A (heater assembly; not a measuring instrument)
Output
N/A (resistive heating assembly; optional thermostats/thermocouples)
Supply
Configured per order (typical industrial VAC classes in Watlow immersion literature)
Protection
Terminal enclosure options per immersion heater catalog
Ambient temperature
Application-dependent; sheath/material limits per catalog
Fits tank and vessel immersion heating where you need a Watlow square-flange heater with WATROD or FIREBAR tubular elements and dry-side screw terminals.
Key advantages
- Type — Square-flange immersion heater with WATROD/FIREBAR elements
- Mounting — Square flange plate with corner bolt holes
- Elements — Hairpin/tubular elements welded or brazed to flange
- Terminals — Screw-type electrical terminals on the dry side
- Duty — Water, oils, and process fluid immersion
Typical applications
- Open or closed tank immersion heating.
- Vessel sidewall/bottom flange mounts.
- OEM skids specifying square flange plates.
Selection guide
- Element type — WATROD vs FIREBAR
- kW / V / phase — Heat duty
- Flange size / materials — Tank interface
- Thermostat / TC — Control/protection options
Common mistakes
- Dry-firing above liquid level.
- Wrong flange bolt pattern vs tank.
- Sheath material incompatible with fluid.
When to RFQ / what to tell us
- Fluid, T, tank opening.
- kW/V/phase; sheath/flange materials.
- Quantity and ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 21709 |
| Brand | Watlow |
| Model | Square Flange Immersion Heater |
| Product type | Immersion Heater |
| Type | Watlow square-flange immersion heater with WATROD/FIREBAR tubular elements |
| Mounting | Square flange plate with corner bolt holes for tank/vessel mounting |
| Elements | Hairpin / tubular heating elements welded or brazed to flange |
| Terminals | Screw-type electrical terminals on the dry side of the flange |
| Applications | Tank and vessel immersion heating of water, oils and process fluids |
| Materials | Multiple sheath and flange material packages per catalog |
Documents
- Watlow square flange immersion documentation — request current OEM PDF on RFQ — request current OEM PDF on RFQ
FAQ
Q: Element styles? A: WATROD and FIREBAR tubular packages.
Q: Mounting? A: Square flange with corner bolt holes for tank/vessel mounting.
Q: What should I send for a quote? A: Fluid/T, kW, flange/materials, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Process/sheath capability class: Alloy 800 square-flange immersion constructions up to 1600 °F (870 °C) per Watlow immersion catalog |
| Accuracy | N/A (heater assembly; not a measuring instrument) |
| Output | N/A (resistive heating assembly; optional thermostats/thermocouples) |
| Supply | Configured per order (typical industrial VAC classes in Watlow immersion literature) |
| Protection | Terminal enclosure options per immersion heater catalog |
| Ambient temperature | Application-dependent; sheath/material limits per catalog |
| Mounting | Square flange immersion heater for tanks/vessels |
| Sensor type | Optional thermostats / thermocouples for process or sheath sensing |
| Notes | Watlow WATROD/FIREBAR square flange immersion heaters. Specs from Watlow immersion heaters OEM catalog (immersion.ashx); no standalone square-flange specification sheet published on watlow.com at harvest. |
| Watt Density | Up to ~100 W/in² (15.5 W/cm²) class for Alloy 800 square-flange constructions (immersion catalog) |
| Element Type | WATROD and FIREBAR elements on square flange mounts |
| Sheath Materials | Alloy 800 and other Watlow immersion sheath options per catalog |