Heat Switches | McMaster-Carr

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175 Products

Thermostats and Guards

Multi-Speed Line-Voltage Thermostats

Control one- and two-speed heaters and air conditioners.

Plug-In Line-Voltage Thermostats

Plug in the thermostat, then plug your heater into the socket on the thermostat's plug.

Line-Voltage Thermostats

Regulate line-voltage HVAC systems.

Line-Voltage Thermostats with Thermowell

Commonly used with hydronic heaters, this thermostat senses the temperature of liquids. The thermowell protects the sensor.

Remote-Sensor Line-Voltage Thermostats

Place sensor in enclosures or different rooms than the rest of the thermostat to control temperature from outside the space. Thermostats work with line-voltage HVAC systems.

Remote-Sensor Line-Voltage
Thermostats with Thermowell

Commonly used with hydronic heaters, this thermostat senses the temperature of liquids. The thermowell protects the sensor.

DIN-Rail Mount Remote-Sensor
Line-Voltage Thermostats

Remote-Sensor Hazardous
Location Line-Voltage Thermostats

Place sensor in enclosures or different rooms than the rest of the thermostat to control temperature from outside the space.

Hazardous Location Line-Voltage Thermostats

Use to regulate line-voltage HVAC systems where flammable gases, vapors, and dust are present. Thermostats are rated Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G.

Washdown Line-Voltage Thermostats

These thermostats are rated NEMA 4X for protection from dirt, washdowns, and corrosion.

Snap-Action Thermostats

Also known as snap discs, these thermostats switch on cooling systems or switch off heating systems when equipment gets too hot.

Enclosure Thermostats for Multiple Devices

Keep electronics in your enclosure from getting too hot or cold with these thermostats that control two devices at once.

Enclosure Thermostats

Control a single heating or cooling device in your enclosure to keep electronics at a safe operating temperature.

Programmable Low-Voltage Thermostats

Set these thermostats to adjust the temperature at certain times each day.

Wi-Fi Enabled Programmable
Low-Voltage Thermostats

Connect to a Wi-Fi network so you can remotely program, monitor, and control the temperature from a computer, tablet, or smart phone.

Low-Voltage Thermostats

These thermostats work with low-voltage HVAC systems that have only one speed.

Remote Room-Monitoring Adjustable Thermostats

If ambient air temperature rises above or falls below an actuation point, this thermostat flashes the current temperature reading on the display and shows a “high” or “low” message.

Direct-Action Air-Powered Thermostats

As the temperature goes up, the pressure in the system goes up.

Reverse-Action Air-Powered Thermostats

As the temperature goes up, the pressure in the system goes down.

Temperature Switches

Compact Threaded Temperature Switches

Since these switches don’t have a housing above the probe, they are often used in tight spaces and low-clearance areas.

Washdown Threaded Temperature Switches

To control heating equipment in washdown environments with splashing water, corrosive liquid, and dust, these switches have a housing that meets NEMA 4X.

Threaded Temperature Switches

Install the threaded probe directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature.

Easy-Adjust Threaded Temperature Switches

Switch heating equipment on and off at a specified temperature by installing these electronic switches directly into tanks, pipelines, and other process components. Simply twist the outer rings to adjust your set point—no need for tools.

Hazardous Location Threaded
Temperature Switches

Often used in hazardous locations, such as chemical plants, refineries, and grain elevators, these switches have a housing that’s UL listed for environments with flammable gases, combustible dust, and ignitable fibers.

Surface-Mount Temperature Switches

Often used to control heat cable output, these switches have mounting holes for surface installation.

Insertion Temperature Switches

Install directly into drilled and reamed holes.

Wall-Mount Temperature Switches

These temperature switches mount on walls and take remote temperature readings with a probe on a cable.

Washdown Wall-Mount Temperature Switches

To protect these switches from splashing water, corrosive liquid, and dust, the housing meets NEMA 4X for washdown conditions.

Hazardous Location Wall-Mount
Temperature Switches

Housing is UL listed for environments with flammable gases, combustible dust, and ignitable fibers, such as chemical plants, refineries, and grain elevators.

Temperature Controllers

Autotuning Temperature Controllers

For high accuracy in applications with fluctuating conditions, these controllers have proportional-integral-derivative (PID) software with fuzzy logic that learns system behavior and automatically compensates for changes.

Washdown Autotuning Temperature Controllers

The faceplate is sealed to meet NEMA 4X for protection in washdown environments with splashing water, corrosive liquid, and dust.

High-Limit Precision Panel-Mount
Temperature Controllers

To protect equipment and personnel, these controllers shut down your machine when it gets too hot and won’t let it turn back on until they’re reset. Mount them to DIN panel cutouts in your heating equipment.

Panel-Mount Temperature Controllers

Install these controllers in DIN panel cutouts to maintain your heating equipment’s temperature. When your machine gets too hot, they turn it on and off in short cycles to cool it down.

Precision Panel-Mount Temperature Controllers

Install these controllers into instrument panels.

Precision Portable Temperature Controllers

These lightweight controllers have a carrying handle.

Precision Washdown Wall-Mount
Temperature Controllers

For protection in washdown conditions with splashing water, corrosive liquid, and dust, these controllers have a housing that meets NEMA 4X.

Thermostats for Electric Water Heaters

Replace the thermostat on your water heater.

Remote-Reading Panel-Mount Freezer Thermometers with Audible Alarm

Remote-Reading Panel-Mount Freezer
Thermometers with Audible Alarm

Protect temperature-sensitive materials in refrigerators and freezers with one of these thermometers that sound an alarm and flash the display when temperature rises above your activation point.

Heat-Actuated Switches

Open or close a circuit when a fusible link melts. These switches are often used as a safety switch to shut off hydraulic equipment.

Drinking Fountain Replacement Parts