Watlow is a world leader in the manufacture of Electric heating elements. Immersion heaters are made with electric elements with a fitting so that the heater can protrude though the tank wall for direct immersion into the liquid or medium being heated. The elements can be made of Copper, Stainless Steel, Steel or Alloy 800 (a nickel enriched metal). Watlow uses Alloy 800 for the majority of their heaters and Stainless for specific types of liquids like DI Water. With the cost of copper skyrocketing, Watlow has discontinued its' use. n this blog are the most common size of screw plug heater the 2 1/2 inch size. 2.5 inch screw plug are popular since a bundle of three elements can be used along with a thermowell. The common voltages are 240 and 480 in either 1 phase or 3 phase, three phase being more common due to the lower amp draw and the widespread use of 480 within USA manufacturing facilities.
Heaters in this blog are designed for use with water or liquids similar in viscosity of water. Oils and other more viscous materials will need different wattages and materials of construction than these water heaters.
Watlow's BLN (3 elements) series Screw Plug Immersion heaters are for CLEAN water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and nickel alloy 800 electric heating elements. The Watt Density is between 59 and 61 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with General Purpose (NEMA 1) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F. Please note that running the elements dry will cause them to burn out. Use a low water cut off or liquid level control to protect the heating elements.
Watlow BLN77L1S, Immersion Heater, 3 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN77L3S4, Immersion Heater, 3 kw, 240 VAC/1 ph, Alloy 800 Elements, 30-110 Tstat
Watlow BLN77L13S7A, Immersion Heater, 3 kw, 480 VAC/1 ph, Alloy 800 Elements, 100-550 Tstat
Watlow BLN710L1S, Immersion Heater, 4.5 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN710L3S4, Immersion Heater, 4.5 kw, 240 VAC/1 ph, Alloy 800 Elements, 30-110 Tstat
Watlow BLN610K13S7A, Immersion Heater, 4.5 kw, 480 VAC/1 ph, Alloy 800 Elements, 100-550 Tstat
Watlow BLN720L3S, Immersion Heater, 9 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLN720L3S4, Immersion Heater, 9 kw, 240 VAC/1 ph, Alloy 800 Elements, 30-110 Tstat
Watlow BLN726C5S, Immersion Heater, 12 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLNF15C3S, Immersion Heater, 15 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLNF28L5S, Immersion Heater, 32 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow's BLN (3 elements) series Screw Plug Immersion heaters are for CLEAN water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and nickel alloy 800 electric heating elements. The Watt Density is between 59 and 61 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with Moisture Resistant/Explosion resistant (NEMA 4 & 7) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F. Please note that running the elements dry will cause them to burn out. Use a low water cut off or liquid level control to protect the heating elements.
Watlow BLN77L1C, Immersion Heater, 3 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN77L3C4, Immersion Heater, 3 kw, 240 VAC/3 phase, Alloy 800 Elements, 30-110 Tstat
Watlow BLN77L13C7A, Immersion Heater, 3 kw, 480 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN710L1C, Immersion Heater, 4.5 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN710L3C4, Immersion Heater, 4.5 kw, 240 VAC/3 phase, Alloy 800 Elements, 30-110 Tstat
Watlow BLN610K13C7A, Immersion Heater, 4.5 kw, 480 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN720L3C, Immersion Heater, 9 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLN720L3C4, Immersion Heater, 9 kw, 240 VAC/3 phase, Alloy 800 Elements, 30-110 Tstat
Watlow BLN720L5C, Immersion Heater, 9 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN726C5C, Immersion Heater, 12 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLNF15C3C, Immersion Heater, 15 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLNF28L5C, Immersion Heater, 32 kw, 480 VAC/3 phase, Alloy 800 Elements
These BLN (3 elements) series Watlow Screw Plug Immersion heaters for PROCESS water or solution water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and nickel alloy 800 electric heating elements. The Watt Density is between 47 and 49 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with General Purpose (NEMA 1) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F. Use of a liquid level control is recommended to protect the heating elements from "running dry"! The use of a contactor may also be required to switch a high amp load.
Watlow BLN79G3S, Immersion Heater, 3 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLN79G3S5A, Immersion Heater, 3 kw, 240 VAC/1 ph, Alloy 800 Elements, 60-250 Tstat
Watlow BLN79G5S4, Immersion Heater, 3 kw, 480 VAC/1 ph, Alloy 800 Elements, 30-110 Tstat
Watlow BLN712R1S, Immersion Heater, 4.5 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN712R3S5A, Immersion Heater, 4.5 kw, 240 VAC/1 ph, Alloy 800 Elements, 60-250 Tstat
Watlow BLN712R5S7A, Immersion Heater, 4.5 kw, 480 VAC/1 ph, Alloy 800 Elements, 100-550 Tstat
Watlow BLN719R3S4, Immersion Heater, 7.5 kw, 240 VAC/1 ph, Alloy 800 Elements, 30-110 Tstat
Watlow BLN719R5S, Immersion Heater, 7.5 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN724R3S7A, Immersion Heater, 9 kw, 240 VAC/1 ph, Alloy 800 Elements, 100-550 Tstat
Watlow BLN724R5S, Immersion Heater, 9 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN739R5S, Immersion Heater, 15 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN747G5S, Immersion Heater, 18 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow Heater Cmpany BLN (3 elements) series Screw Plug Immersion heaters for PROCESS water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and nickel alloy 800 electric heating elements. The Watt Density is between 47 and 49 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with Moisture Resistant/Explosion resistant (NEMA 4 & 7) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F. Liquid level controls should be used to protect the heater from turning on with no liquid present. Call Flow Factor for Explosion Proof Level control.
Watlow BLN79G1C, Immersion Heater, 3 kw, 120 VAC/1 phase, Alloy 800 Elements
Watlow BLN79G3C5A, Immersion Heater, 3 kw, 240 VAC/3 phase, Alloy 800 Elements, 60-250 Tstat
Watlow BLN79G5C7A, Immersion Heater, 3 kw, 480 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN717G3C, Immersion Heater, 6 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLN717G3C7A, Immersion Heater, 6 kw, 240 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN717G5C5A, Immersion Heater, 6 kw, 480 VAC/3 phase, Alloy 800 Elements, 60-250 Tstat
Watlow BLN719R3C7A, Immersion Heater, 7.5 kw, 240 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN724R3C, Immersion Heater, 9 kw, 240 VAC/3 phase, Alloy 800 Elements
Watlow BLN724R3C7A, Immersion Heater, 9 kw, 240 VAC/3 phase, Alloy 800 Elements, 100-550 Tstat
Watlow BLN724R5C, Immersion Heater, 9 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN732G5C, Immersion Heater, 12 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN739R5C, Immersion Heater, 15 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow BLN747G5C, Immersion Heater, 18 kw, 480 VAC/3 phase, Alloy 800 Elements
Watlow's BLR (3 elements) series Screw Plug Immersion heaters for DI OR DEMINERALIZED water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and STAINLESS STEEL electric heating elements. The Watt Density is between 59 and 61 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with General Purpose (NEMA 1) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F. Liquid Level control is important to protect the elements from burning up in dry air. Over Temperature limits are also a good idea.
Watlow BLR77L1S, Immersion Heater, 3 kw, 120 VAC/1 phase, Stainless Steel Elements
Watlow BLR77L3S4, Immersion Heater, 3 kw, 240 VAC/1 ph, Stainless Steel Elements, 30-110 Tstat
Watlow BLR77L5S5A, Immersion Heater, 3 kw, 480 VAC/1 ph, Stainless Steel Elements, 60-250 Tstat
Watlow BLR710L5S, Immersion Heater, 4.5 kw, 480 VAC/3 phase, Stainless Steel Elements
Watlow BLR714L3S4, Immersion Heater, 6 kw, 240 VAC/1 ph, Stainless Steel Elements, 30-110 Tstat
Watlow BLR714L5S5A, Immersion Heater, 6 kw, 480 VAC/1 ph, Stainless Steel Elements, 60-250 Thermostat
Watlow BLR717L3S4, Immersion Heater, 7.5 kw, 240 VAC/1 ph, Stainless Steel Elements, 30-110 Thermostat
Watlow BLR717L5S, Immersion Heater, 7.5 kw, 480 VAC/3 phase, Stainless Steel Elements
Watlow BLR720L3S4, Immersion Heater, 9 kw, 240 VAC/1 ph, Stainless Steel Elements, 30-110 Thermostat
Watlow BLR720L3S7A, Immersion Heater, 9 kw, 240 VAC/1 ph, Stainless Steel Elements, 100-550 Thermostat
Watlow BLR726C5S, Immersion Heater, 12 kw, 480 VAC/3 phase, Stainless Steel Elements
Watlow BLR731L5S, Immersion Heater, 15 kw, 480 VAC/3 phase, Stainless Steel Elements
Watlow BLR737C5S, Immersion Heater, 18 kw, 480 VAC/3 phase, Stainless Steel Elements
Watlow's BLR (3 elements) series Screw Plug Immersion heaters for DI OR DEMINERALIZED water have a 2 1/2 inch NPT(M) Stainless Steel Screw Plug and nickel alloy 800 electric heating elements. The Watt Density is between 59 and 61 and total wattages from 2 to 18 kilowatts (KW). Voltages come in 120 single phase or 240 and 480 three phase with Moisture Resistant/Explosion resistant (NEMA 4 & 7) enclosure. The units with the built in Thermostat have a range of 30-110F, 60-250F or 100-550F.
Watlow BLR77L1C, Immersion Heater, 3 kw, 120 VAC/1 phase, Stainless Steel Elements, Ex. Proof
Watlow BLR77L3C4, Immersion Heater, 3 kw, 240 VAC/3 phase, Stainless Steel Elements, 30-110 Thermostat
Watlow BLR77L5C7A, Immersion Heater, 3 kw, 480 VAC/3 phase, Stainless Steel Elements, 100-550 Thermostat
Watlow BLR710L3C, Immersion Heater, 4.5 kw, 240 VAC/3 phase, Stainless Steel Elements, Ex. Proof
Watlow BLR710L3C7A, Immersion Heater, 4.5 kw, 240 VAC/3 ph, Stainless Steel Elements, 100-550 Thermostat
Watlow BLR710L5C5A, Immersion Heater, 4.5 kw, 480 VAC/3 ph, Stainless Steel Elements, 60-250 Thermostat
Watlow BLR714L5C4, Immersion Heater, 6 kw, 480 VAC/3 phase, Stainless Steel Elements, 30-110 Thermostat
Watlow BLR717L3C, Immersion Heater, 7.5 kw, 240 VAC/3 phase, Stainless Steel Elements, Ex. Proof
Watlow BLR717L5C, Immersion Heater, 7.5 kw, 480 VAC/3 phase, Stainless Steel Elements, Ex. Proof
Watlow BLR720L3C5A, Immersion Heater, 9 kw, 240 VAC/3 phase, Stainless Steel Elements, 60-250 Thermostat
Watlow BLR720L5C, Immersion Heater, 9 kw, 480 VAC/3 phase, Stainless Steel Elements, Ex. Proof
Watlow BLR726C5C, Immersion Heater, 12 kw, 480 VAC/3 phase, Stainless Steel Elements, Explosion Proof Housing
Watlow BLR731L5C, Immersion Heater, 15 kw, 480 VAC/3 phase, Stainless Steel Elements, Explosion Proof
Watlow BLR737C5C, Immersion Heater, 18 kw, 480 VAC/3 phase, Stainless Steel Elements, Explosion Proof Housing
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