NuSource LLC
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Since the introduction of its nuclear pressurizer heater in 1966, Watlow has been a major source for designers and contractors who specialize in serving the nuclear power industry.  For over fifty years, it’s been the Watlow name behind many of the critical application heaters used in our industry.

Today, facility managers who face obsolescence can get like-for-like replacement parts with the same premium design, construction, and performance of the Watlow originals - and from a proven, trusted partner who can bring decades of experience and know-how to your project. 

For critical application heaters and Watlow trusted design, your new source is NuSource.
   PARTNERSHIP ANNOUNCEMENT
   DOWNLOAD EDG PRESSURIZER HEATER SPEC SHEET
​​   DOWNLOAD EDG IMMERSION HEATER SPEC SHEET

EDG Immersion Heaters

Emergency Diesel Generator
Immersion Heaters
  • Jacket Water Heaters
  • Lube Oil Heaters (Immersion)
Features
  • ANSI and ANSI compatible 2, 2½, 3 thru 48 inch flanges
  • All units are inspected and/or tested to ensure element-to-flange pressure seals do not leak
  • Integrel thermowells provide convenient temperature sensor insertion and replacement without draining the fluid being heated
  • Standard, general purpose terminal enclosure for easy access to wiring
  • UL® and CSA component recognition

Pressurizer Heater

ASME Section III, NPT stamped 
Pressurizer Heaters
  • Operating temperature up to 800°F (426°C)
  • Operating pressure up to 2500 psi (17.2 MPa)
  • Power up to 55 kW (based on design)
  • Power supply: 240-600V, single- or 3-phaseWatt densities up to 190 W/in2 (29.4 W/cm2)
  • Plant mean-time between failures greater than 20 years
Features
  • Wound-core heater technology with enhanced magnesium oxide (MgO)insulation inside stainless steel sheath
  • High temperature, high pressure seal technology provides a secondary level of protection - a proven leak-proof design
  • Terminal lugs with captive nut connectors eases installation
  • Nickel-chromium resistance wire combined with enhanced MgO and proprietary manufacturing processes ensures reliability and long life of the heater
  • True no-heat with discrete separation from heating element
  • Reduces residual heat flow towards pressurizer weld connections thus eliminating need for heat sinks
  • Decreases stress-corrosion cracking when used at the support plate
  • Allows easy identification of no-heat length through standard radiographic viewing

 PRODUCTS OFFERED

  • EDG IMMERSION HEATERS​
  • PRESSURIZER HEATERS
  • BORIC ACID TANK HEATING
  • ​​PERIPHERAL NUCLEAR APPLICATIONS​​
    • Control Building Air Handling (CBA) System Emergency Cleanup Filters
    • Hydrogen Recombiner Duct Heater
    • Demineralized Water Treatment System​
  • OTHER APPLICATIONS
    • ​Test Systems
    • Main Turbine Lube Oil Conditioning
    • Nuclear Waste Treatment
    • Degasser Condenser Heaters
    • Steam Turbine Temperature Sensors
    • Superheated Steam for Packing Glands
    • Balance of Plant Thermal Systems
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​NuSource LLC
320 King Street
​Alexandria, VA 22314
Corporate:  (571) 482-7404
[email protected]

© 2025 NuSource, LLC. All Rights Reserved
  • ABOUT
    • HISTORY & HIGHLIGHTS
    • CAREERS
  • CAPABILITIES
    • ENGINEERING
    • FABRICATION
    • FACILITIES
  • TEAMING AGREEMENTS
    • CARRIER
    • FLEXASEAL
    • NUCCORP
    • PALL
    • SWAGELOK
    • WATLOW
    • XYLEM / AM STANDARD
  • QA PROGRAM
  • NEWS