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FIREROD® water immersion heaters are ideal for replacing large screw-plug immersion heaters. The heater packages up to 300 W/in2 (46.5 W/cm2) in a compact unit, thus the product can be very versatile when designed into a heating system.

These water immersion heaters come complete with a brass 3⁄4 inch National Pipe Thread Taper (NPT) double threaded fitting, which allows you to add conduit boxes. Also, FIREROD immersion heaters are sealed at the lead end with a silicone rubber seal.

Solid copper leads, with silicone rubber sleeves, are provided for unrestricted wiring. These units are recommended for immersion in water or 90+ percent water soluble solutions.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 800  212 100 300 46.5
  • Maximum operating temperature in water to 212°F (100°C) at atmospheric pressure
  • Maximum watt density to 300 W/in² (46.5 W/cm²)
  • Maximum voltage to 480VAC


  • Plastic reclamation
  • Food preparation
  • Lab equipment

Features & Benefits:

Features Benefits
Nickel-chromium resistance wire precisely centered in the unit
  • Ensures even, efficient distribution of heat to the sheath
MgO insulation compacted to the proper density
  • Results in high dielectric strength and contributes to faster heat-up
Alloy 800 sheath
  • Resists corrosion from water
Metallurgically-bonded conductor pins
  • Overlaps the resistance wire inside the core, ensuring trouble-free electrical continuity
Lead end with silicone rubber seal
  • Protects the heater against moisture contamination
Stainless steel fittings
  • Offers availability for use in corrosive applications
Horizontal through the wall tank mounting
  • Provides faster set-up
240 and 480VAC voltage
  • Allows flexibility in wiring the heater for use in your particular applications