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Immersion Heaters 

Watlow's immersion heaters are designed primarily for direct immersion in liquids such as water, oils, solvents and process solutions, molten materials as well as air and gases. By generating all the heat within the liquid or process, these heaters are virtually 100 percent energy efficient. These versatile heaters can also be formed and shaped into various geometries for radiant heating and contact surface heating applications. UL® and CSA component recognized elements are available.
Product Material  Maximum Operating Temperatures  Maximum Watt Densities 
°F °C W/in2 W/cm2
WATROD and FIREBAR Screw Plug Immersion Heaters Screw Plug Immersion Heaters 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 
WATROD and FIREBAR ANSI Flange Immersion Heaters ANSI Flange Immersion Heaters Alloy 800   1600   870   100   15.5 
Stainless steel   1200   650   100   15.5 
Steel   750   400   100   15.5 
N/A   350   175   100   15.5 
WATROD and FIREBAR ANSI Flange Immersion Heaters Flange Immersion Heaters Alloy 800   1600   870   100   15.5 
304 stainless steel   1200   650   100   15.5 
Steel   750   400   30   4.7 
N/A   350   175   45   6.9 
Over-the-side Immersion Heaters Over-the-Side Heaters Alloy 800   1600   870   60   9.3 
N/A   1400   760   43   6.7 
N/A   750   400   23   3.6 
N/A   1200   650   60   9.3 
FIREROD Immersion Heaters FIREROD Immersion Heaters Alloy 800   212   100   300   46.5 
 

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