Screw plug immersion heaters are ideal for direct immersion heating of liquids, including all types of oils and heat transfer solutions.
Available in a variety of sizes, Watlow® screw plug immersion heaters feature both WATROD™ round and FIREBAR® flat tubular elements.
Heating elements are hairpin bent and either welded or brazed into the screw plug —depending on element sheath and plug material compatibility.
General purpose terminal enclosures are standard; with optional moisture resistant, explosion resistant and explosion/moisture resistant enclosures available to meet specific application needs.
Optional thermostats provide convenient process temperature regulation to the screw plug immersion heater.
Specifications:
| Material | Maximum Operating Temperatures | Maximum Watt Densities | ||
|---|---|---|---|---|
| °F | °C | W/in2 | W/cm2 | |
| Alloy 800/840 | 1600 | 870 | 120 | 18.6 |
| 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 38 kilowatts
- UL® and CSA component recognition to 480VAC and 600VAC respectively
- Alloy 800/840 sheath temperatures to 1600°F (870°C)
- Passivated 316 stainless steel sheath temperatures up to 1200°F (650°C)
- 304 stainless steel sheath temperatures up to 1200°F (650°C)
- Steel sheath temperatures up to 750°F (400°C)
Applications:
- Deionized water
- Demineralized water
- Clean water
- Potable water
- Process water
- Industrial water rinse tanks
- Vapor degreasers
- Hydraulic oil, crude, asphalt
- Lubricating oils at API specified watt densities
- Air and gas flow
- Caustic solutions
- Chemical Baths
- Anti-freeze (glycol) solutions
- Paraffin
Features & Benefits:
| Features | Benefits |
|---|---|
| A variety of element sheath and screw plug materials |
|
| Integral thermowells |
|
| Terminal enclosures |
|
| Welding or brazing WATROD and FIREBAR elements to the screw plug |
|
| WATROD hairpins are repressed (recompacted) |
|
| 2½ in. (64mm) NPT screw plug assemblies feature element support(s) |
|
| 316 Stainless Steel Heaters |
| Circulation Heaters |
| Duct Heaters |
| FIREBAR/Tubular Heaters |
| FIREROD® Cartridge Immersion |
| Flange Immersion Heaters |
| High Temperature Tubular Heater |
| MULTICOIL Tubular Heaters |
| Over-the-Side Immersion Heaters |
| Packaging Seal Bar Heaters |
| Screw Plug Immersion Heaters |
| Watlow Process Solutions |
| WATROD Tubular Heaters |
| Complete Thermal System Solutions for Plastics Processing |
| FIREBAR Heaters |
| Thermal Solutions for Foodservice Equipment |
| Thermal Solutions for Photovoltaic Processing Equipment |
| Watlow’s Heating Solutions For Your Applications |
| FIREBAR Flange Heater Installation & Maintenance Manual |
| FIREBAR Screw Plug Installation & Maintenance Manual |
| Thermostat Control Installation & Maintenance Manual |
| WATROD & FIREBAR Installation & Maintenance Manual |
| WATROD Circulation Heater Installation & Maintenance Manual |
| WATROD Duct Heater (Module Only) Installation & Maintenance Manual |
| WATROD Duct Heater Installation & Maintenance Manual |
| WATROD Flange Heater Installation & Maintenance Manual |
| WATROD Modular Duct Heater Installation & Maintenance Manual |
| WATROD Over-the-Side Installation & Maintenance Manual |
| WATROD Screw Plug Installation & Maintenance Manual |
| Humidity Conditioning Requirements of Commercial Electric Cooking Appliances per UL 197 |
| ISO 9001:2008 (2013-2016) Hannibal |
| Heater Catalog (Section) – Agency Certifications |
| Heater Catalog (Section) – Immersion Heaters |
| Heater Catalog (Section) – Heater Reference Data |
| Heater Catalog (Complete – .pdf) |
