Watlow offers the most complete product line in the industry. With more than a quarter of a million designs on file, Watlow has the heater, sensor, or controller to meet your needs. read more

While some companies manufacture just heaters or just controllers, Watlow provides single source performance accountability by creating all thermal system components. From electric heaters of all types and sizes, power controllers that maximize heater performance, temperature controllers for more precise heat regulation, to sensors that provide the controllers with accurate temperature signals, you can count on Watlow to design thermal systems in which the components work together better.

Watlow's controllers are built with Control Confidence® to withstand hostile environments such as heat, electrical noise, static discharge, humidity, and vibration.

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Thermocouples

Thermocouples

Thermocouples are a type of temperature sensor that uses two dissimilar metals joined at one end. Since different metals generate different voltages when exposed to a thermal gradient, the difference between the two measured voltages corresponds to temperature. Owing to their simplicity, adaptability and low cost; thermocouples are one of the most widely used temperature sensors available.

Temperature Controllers

Temperature Controllers

Temperature controllers are designed to maintain desired temperature levels, regardless of external conditions. Whether it needs to stay at one setpoint or exist within a range, these controllers ensure safety, reduce variability, and increase overall efficiency. With seemingly endless uses, they are mostly utilized in commercial and industrial applications but can also be used in domestic applications.

Tubular Heaters

Tubular Heaters

A general category of devices that generate heat as part of a manufacturing or industrial process. Process heaters are designed to be installed into tanks or ducts to apply heat directly to liquids and gases. These heaters are frequently used in boilers and industrial tanks, curing and drying applications, and many more.

Process Controllers

Process Controllers

Process controllers maintain the output of process variables such as temperature, pressure, flow, or level within a pre-set range. They use feedback from sensors to identify any deviation from a setpoint and automatically adjust output until parameters are back within range. This precise control improves quality control while enabling automation among complex processes. This improves efficiency and safety without the need for more labor.

Available Products by Watlow

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Watlow WATROD Tubular Heater
Single- and double-ended tubular heating elements
Call for pricing
Watlow Specialty RTDs
Six styles of RTDs with standard industrial insulated leads
$55.13
Watlow RT Style RTD
RT Style RTDs for use with thermowells
$79.37
Watlow EZ-ZONE PM Controller
Power and functionality of a limit controller, PID controller, or integrated controller with Bluetooth connectivity for EZ-Link app
$188.00
In Stock
Watlow FIREROD Cartridge Heater
Superior heat transfer, uniform temperatures, resistance to oxidation and corrosion, and a long life even at high temperatures
$25.40
Watlow F4T Process Controller
1/4 DIN, color touch screen panel with high resolution graphical user-interface and 1 to 4 control loops
$699.00
In Stock
Watlow DIN-A-MITE Power Controller
Innovative power controller, available in 4 models, can handle loads up to 100 amps
$132.00
In Stock
Watlow EZ-ZONE PM Express Controller
Temperature controller or other basic process application, choice of limit or PID, with Bluetooth connectivity for EZ-Link app
$188.00
In Stock
Watlow FLUENT In-Line Heater
High watt density in a low mass heater optimizes heat transfer & temperature uniformity
$384.30
Watlow Wire Wound Element Silicone Rubber Flexible Heaters
Versatile Watlow heaters, capable of custom design and flexibility to meet almost any heating application even where space is limited
$25.20
Watlow LV Series Limit Controller
Most basic and economical limit controller
$172.00
Watlow Screw Plug Immersion Heater
Ideal for direct immersion heating of liquids
Call for pricing
Watlow F4S Ramping Temperature Controller
1/4 DIN single channel ramping controller
$1,525.00
Watlow Series CV Temperature Controller
Most basic and economical 1/8-DIN-square limit / temperature controllers
$131.00
Watlow EZ-ZONE RM Control Module (RMC) Multi-Function Controller
1 to 4 loops of control, multi-function high performance controller
$175.00
In Stock
Watlow D4T Data Logger
1/4 DIN data logger, field removable I/O modules for maximum design flexibility, 4.3 inch color, graphical touch panel
$1,119.00
Watlow Etched Foil Element Silicone Rubber Flexible Heaters
Improve heat transfer, speed warm-ups, and decrease wattage requirements
Select options for pricing
Watlow MI Band Heater
Provides the high temperatures and watt densities needed for today's demanding procedures
Call for pricing
Watlow WATROD Duct Heater
The perfect heating solution for non-pressurized, air-heating applications
Call for pricing
Watlow FIREROD Immersion Heater
Compact, versatile immersion heater for water or water solutions 90% or above
Call for pricing
Watlow F4D Ramping Temperature Controller
1/4 DIN dual channel ramping controller
$1,779.00
Watlow Rigid Sheath Thermocouple
General application rigid sheath thermocouple
$18.86
In Stock
Watlow F4P Temperature Controller
1/4 DIN high performance controller offers versatility in process / temperature applications
$1,305.00
Watlow ASPYRE Power Controllers
Modular and scalable power controllers with a SCR design to deliver reliable results with minimal maintenance
$505.00
Watlow Power Series Controllers
Microprocessor-based SCR power controller
$1,810.00
Watlow Flange Immersion Heater
Flanged immersion heaters for heating liquids and gases in tanks and pressure vessels
Call for pricing
Watlow RB Style RTD
RB Style RTDs with standard industrial insulated leads
$43.97
Watlow EZ-ZONE RM Scanner Module (RMS) Multi-Function Controller
4 to 16 auxiliary analog inputs, multi-function high performance controller
$350.00
Watlow Insulated Wire Thermocouple
General application constructed with SERV-RITE insulated wire thermocouple
$11.33
Watlow PM PLUS PID & Integrated Limit Controller
Enhanced interface for easier programming and readability, 1/16 DIN panel mount, Bluetooth compatible
$282.00
Watlow Solid State Relays
Longer heater life, fast cycle card, zero cross firing, back-to-back SCR design
$40.00
Watlow Silver Series EM Operator Interface Terminal
Touchscreen operator interface terminal (OIT) with serial and Ethernet communications, e-mail messaging, and USB host
$415.00
Watlow RR Style RTD
RR Style connection head RTDs
$78.27
Watlow EZ-ZONE RM High-Density Control Module (RMH) Controllers
4 to 16 loops of control, multi-function high performance controller
$790.00
Watlow 375 High Temperature Strip Heaters
Capable of both high temperatures and high watt densities with uniform heat and welded post terminals for strong connections
Call for pricing
Watlow Square Flange Immersion Heater
Square flange immersion heaters designed for use in boilers and industrial storage tanks
Call for pricing
Watlow Circulation Heater
Watlow WATROD or FIREBAR heating elements combined with all necessary appliances to form a complete heating assembly
Call for pricing
Watlow Ceramic Fiber Heater
Extremely low mass and high insulation value units with self-supported heating elements
Call for pricing
Watlow EZ-ZONE ST Temperature Controller
Integrated thermal loop solid state controller
$257.00
In Stock
Watlow AR Style Mineral Insulated Thermocouple with Connection Head
Fast-responding, durable, capable, and ideal for handling higher temperatures
$63.22
Watlow RF Style RTD
RF Style metal transition RTDs
$104.91
Watlow EZ-ZONE RM Access Module Multi-Function (RMA) Controllers
Communication protocol options, data logging and automatic configuration backup
$155.00
Watlow Rigid Sheath Thermocouple with Threaded Fitting
General application rigid sheath with threaded fitting thermocouple
$33.96
In Stock
Watlow WATCONNECT Temperature Control Panel
Applications from 1kW to 5 MW, suited for heaters, sensors and temperature control and power control products
Call for pricing
Watlow Pipe Clamp Thermocouple
General application pipe clamp style thermocouple
$20.51
Watlow QPAC Series SCR Power Controller
Modular silicon controlled rectifier (SCR) power controller with plug-in features for flexibility, available in 150 to 1000 ampere ratings
$3,755.00
Watlow Ring Terminal Thermocouple
General application ring terminal style thermocouple
$15.66
Watlow AC Style Mineral Insulated Standard Plug Thermocouple
Mineral insulated single element thermocouple with standard plug or jack termination
$23.37
Watlow Cable Heater
High performance, high temperature heater can be cold-formed into almost any shape
Call for pricing
Watlow EZ-ZONE RM Expansion Module (RME) Multi-Function Controllers
Additional inputs and outputs and higher amperage outputs, multi-function high performance controller
$150.00
Watlow EZ-ZONE RM Limit Module (RML) Multi-Function Controllers
4 to 12 safety limits, PID control loops, over/under temperature limit control loops
$475.00
Watlow AC Style Mineral Insulated Mini Plug Thermocouple
Mineral insulated single element thermocouple with mini plug or jack termination
$21.70
Watlow Rigid Sheath Fixed Bayonet Thermocouple
General application rigid sheath fixed bayonet thermocouple
$25.86
In Stock
Watlow Large Diameter Rigid Sheath Fixed Thermocouple
General application large diameter rigid sheath thermocouple
$21.01
In Stock
Watlow AR Style Mineral Insulated Dual Element Thermocouple w/ Connection Head
Fast-responding, dual element, durable, and ideal for handling higher temperatures
$68.31
Watlow STARFLOW Circulation Heater
Designed to heat gas streams to 1400°F for drying applications
Call for pricing
Watlow E-SAFE II Hybrid Power Switch
Provides reliable and accurate power switching up to 35 amps at 70°C (158°F)
$45.00
Watlow FIREBAR Heater
Innovative, flat surface design improves heater performance
Call for pricing
Watlow Adjustable Spring Thermocouple
General application adjustable spring thermocouple
$20.89
Watlow Silicone Rubber Composite Heaters
Design includes equal length circuits and a no-heat tab for temperature uniformity
Call for pricing
Watlow Flange Style Thermocouple
General application flange style thermocouple
$25.86
Watlow AF Style Mineral Insulated Thermocouple with Metal Transitions
Thermocouple with spring strain relief and metal transitions
$27.74
Watlow Adjustable Armor Thermocouple
General application adjustable armor thermocouple
$23.76
Watlow Nozzle Style Thermocouple
General application nozzle style thermocouple
$25.25
Watlow Finbar Heater
Improves heat transfer to the air and permits putting more power in tighter spaces
Call for pricing
Watlow AS Style Mineral Insulated Wafer Head Thermocouple
Wafer head design allows quick access to terminal screws for wiring
$33.92
Watlow RC Style RTD
RC Style RTDs with plug or jack termination
$70.08
Watlow AF Style Mineral Insulated Dual Element Thermocouple
Thermocouple with spring strain relief and metal transitions
$36.02
Watlow WATROD Multicoil Tubular Heater
Versatile and innovative tubular heating element with multiple coils and/or thermocouples
Call for pricing
Watlow Coiled Nozzle Heater
High performance heater designed specifically for nozzle applications
Call for pricing
Watlow Grommet Style Thermocouple
Stainless steel grommet with extremely low profile for fast response time
$10.80
Watlow AB Style Mineral Insulated Cut and Stripped Dual Element Thermocouple
Dual element sensor with mineral insulation for performance allows users to terminate the thermocouple for convenience
$17.67
Watlow PFA Encapsulated Thermocouple
General application PFA encapsulated thermocouple
$37.26
Watlow Brass Shim Style Thermocouple
General application brass shim style thermocouple
$16.04
Watlow Stainless Steel Shim Style Thermocouple
Low profile thermocouple can be placed between components for measurement of surface temperature
$14.17
Watlow AT Style Mineral Insulated Thermocouple For Use with Thermowells
Fast-responding, durable, capable, and ideal for handling higher temperatures
$63.18
Watlow AT Style Mineral Insulated Dual Element Thermocouple
Fast-responding, durable, dual element, and ideal for handling higher temperatures
$68.32
Watlow AQ Style Mineral Insulated Miniature Transitions Thermocouple
Watlow AQ Style Mineral Insulated Miniature Transitions Thermocouple
$39.43
In Stock
Watlow Flexible Thermocouple Extensions
Watlow Flexible Thermocouple Extensions
$7.61
Watlow AB Style Mineral Insulated Cut and Stripped Thermocouple
Cut and stripped mineral insulated thermocouples allow users to customize termination
$12.96
Watlow AS Style Mineral Insulated Wafer Head Dual Element Thermocouple
Wafer head design allows quick access to terminal screws for wiring
$42.49
Watlow High Density Flex Modules
Four channel input module for use with the Watlow F4T or D4T
$75.00
Watlow SERV-RITE Thermocouple Wire
Premium performance and reliability, Insulation temperature ranges from -328 to 2600°F (-200 to 1427°C)
$22.00
Watlow SpecView HMI Software
Communicates with any EZ-ZONE controllers, flexible data logging and report generator
$1,155.00
Watlow Quencharc RC Suppressor
Protects EZ-ZONE controller outputs from damage that can be caused by voltage spikes from inductive loads (250VAC max)
Watlow Mixed I/O Flex Modules
Single channel module for use with the Watlow F4T or D4T, 2 outputs available
$25.00
Watlow Limit Flex Module
Limit control with universal, thermistor and temperature inputs for use with Watlow F4T or D4T
$90.00
In Stock
Watlow 50A Current Transformer
0 to 50A transformer for EZ-ZONE RM multifunction controllers
$60.00
In Stock
Watlow Remote User Interface
In-panel display and interface for the Watlow EZ-Zone ST Integrated Control Loop
$129.00
Watlow SC Series Standard Connector
SC Standard Connectors are ASTM color coded and made of Compensated alloys
$5.78
Watlow Communication Flex Module
Modbus RTU 232/485 communications for slot 6 of the Watlow F4T or D4T
$75.00
Watlow MC Series Miniature Thermocouple Connectors
Miniature design enables mating with other miniature size thermocouple connectors
$4.40
In Stock
Watlow DIN-A-MITE Fuse Holders
DIN rail mount fuse holders for Watlow DIN-A-MITE power controllers and SSRs
$22.00
In Stock
Watlow SAC-220 Cable Clamp Connectors
Cable Clamp Connectors for Male or Female
$2.50
Watlow EtherNet/IP Cable Adapter
For use with EZ-ZONE RM multi-function controllers
$25.00
Watlow Three-Pole Connectors
Three-Pole Connectors for RTD Applications, 400ºF (200°C)
$12.52
Watlow AC/DC Power Supply Converter
From 90-264VAC to 24VDC (2.5A, 60W) for EZ-ZONE RM multi-function controllers
$240.00
Watlow DIN-A-MITE Fuses
Semiconductor fuses for Watlow DIN-A-MITE power controllers and SSRs
$11.00
In Stock
Watlow Standard Thermocouple Connection Heads
Made of cast iron (1/2, 3/4, or 1in NPT) or aluminum (1/2in NPT)
$39.85
Watlow SKP Single Panel Mount Hardware
Connectors Single Panel Mount Hardware, 425°F (218°C)
$19.92
Watlow 08-5362 Manual Control Kit
Manual control kit for the QPAC series
$90.00
Watlow QPAC Current Transformer
150A, 200A, 300A, 400A, 500A, 600A, 800A and 1000A options
$90.00
Watlow 50500701 / 50500801 Terminal Blocks for PT Heads
Single or dual elements for the PT Series polypropylene head
$10.25
Watlow 16-0176 Interstage Transformer
5A, 20mA interstage transformer
$80.00
Watlow 0219-0382-0000 USB Cable
5-foot USB cable for downloading projects from a PC to the Watlow Silver Series operator interface terminal
$16.00
Watlow Screen Covers
Protective screen covers for the Watlow Silver Series Operator Interface Terminal
$46.00
Watlow Silver Series Power Supply
Power supply for Watlow Silver Series Operator Interface Terminals
$65.00
Watlow 0219-0388-0000 Communication Cable
Communication cable for 4.3 inch screen versions of Silver Series Operator Interface Terminals
$67.00
Watlow 0219-0374-0000 Communication Cable
Communication cable for 7 and 10 inch versions Silver Series Operator Interface Terminals
$67.00