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Watlow BLR77L5S4 Immersion Heater
  • Watlow BLR77L5S4 Immersion Heater
  • BLR77L3S4-drawing

BLR77L5S4 screw plug immersion heater

  • Comes with a general purpose enclosure and a thermostat
  • DPST on/off from 30°F to 110°F with differential setting up to 12°F
  • the heater has (3) 316-ss passivated 7.625-inch length heating elements
  • with epoxy resin end seals rated at 194°F and a thermowell for sensor.
  • The heater has no heat the first 2.625 inches from the screw plug and has
  • an approximate shipping weight of 7/lbs.
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Applications that require heating Deionized/Demineralized Water

  • Steam boilers and cooling systems
  • Manufacturing lead-acid batteries
  • Car washes
  • Electronics manufacturing
  • Medical and Pharmaceutical manufacturing
  • Cleaning processes
  • Manufacturing Cosmetics and Personal Care Products

Features & Benefits of the Watlow® immersion heater

The integral thermowell provides a convenient method for temperature sensor insertion and allowing a replacement without draining the fluid being heated. The CSA approved general purpose enclosure can be rotated to simplify connecting to existing conduits. The WATROD™ hairpin bends are re-compacted to maintain the mineral insulation density and maintain the dielectric strength and heat transfer efficiency. The heating elements have a bright annealing passivation for corrosion resistance and the elements have a support to ensure proper spacing to maximize the heater’s performance.

Product Details
1 Item

Data sheet

CSA general purpose
30° ~ 110°F range with up to 12° differential
Line power
480v AC 3-phase delta
3000 watt
2-1/2" NPT screw plug
Immersion Length