Digital Thermostats | McMaster-Carr

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15 Products

Programmable Low-Voltage Thermostats


Push Button	Touchpad

Set these thermostats to adjust the temperature at certain times each day. They control low-voltage HVAC systems. You can lock the settings to prevent unwanted or accidental changes, which is helpful in public areas. If the power fails, these thermostats have battery backup to retain your program.

Touch-Pad Control—Touchpad thermostats can be used with a remote sensor (sold separately) that takes temperatures up to 300 ft. from the thermostat.

For Single Stage System Efficiency—Single-stage thermostats work with systems that have only one speed.

For Multistage System Efficiency—Multistage thermostats work with systems that have up to three heating speeds and two cooling speeds.

Daily Program Function—Thermostats with a daily program function can have an individual program for each day of the week.

	For System							Overall
	Type	Efficiency	Program Function	Voltage, V AC	Current, amp	Temp. Setting, ° F	Electrical Connection Type	Ht.	Wd.	Dp.	Batteries Included	For Use Outdoors	Mounting Fasteners Included	Features	Display Type		Each
For Air Conditioners and Heaters







				Push-Button Control

				Electric Gas Heat Pump Oil	Single Stage	Weekday/Saturday/Sunday	Millivolt to 30V AC	1.5	45 to 99	Hardwire	3 3/4"	6"	1 1/8"	Yes	No	Yes	Battery Backup, Lockable Settings	Digital	1821K34	000000




						Touch-Pad Control

						Electric Gas Heat Pump Oil	Single Stage	Daily	Millivolt to 30V AC	1.5	45 to 99	Hardwire	4 5/8"	5 7/8"	1 1/4"	Yes	No	Yes	Battery Backup, Lockable Settings	Digital	1821K17	000000


						Electric Gas Heat Pump Oil Steam	Multistage	Daily	Millivolt to 30V AC	1.5	45 to 99	Hardwire	4 5/8"	5 7/8"	1 1/4"	Yes	No	Yes	Battery Backup, Lockable Settings	Digital	1821K19	000000


						For Heaters







										Push-Button Control

										Electric Gas Heat Pump Oil Steam Water	Single Stage	Daily, Weekday/Weekend, Weekday/Saturday/Sunday	20 to 30	1	40 to 99	Hardwire	4 1/16"	4 1/16"	1 1/8"	Yes	No	Yes	Battery Backup, Lockable Settings	Digital	1821K21	000000

Temperature and Humidity Sensors

		Each
Remote Sensor for Touchpad Thermostats	1821K23	000000

DIN-Rail Mount Remote-Sensing Line-Voltage Thermostats


	Replacement Sensor and Cable

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

						Overall
	Voltage, V AC	Current, amp	Temp. Setting, ° F	Switch Designation	Electrical Connection Type	Ht.	Wd.	Dp.	Sensor Cord Lg., ft.	For Use Outdoors	Mounting Fasteners Included	Mounting Hole Dia.	Display Type	Certification		Each
For Air Conditioners and Heaters







				Keypad Control

				120 to 240	15	-30 to 212	SPDT	Hardwire	5"	2 3/8"	2 3/8"	6	No	No	1/4"	Digital	UL Listed	1760K77	0000000

Temperature and Humidity Sensors

		Each
Replacement Sensor and Cable	1760K711	000000

Wi-Fi Enabled Programmable Low-Voltage Thermostats


Push Button	Touchpad

Touchpad with Remote Sensor

Control, monitor, and program your HVAC system from anywhere. These thermostats connect to a Wi-Fi network, so you can use a computer, tablet, or smartphone to view and adjust settings. You can also lock the settings to prevent accidental changes or tampering in public areas. They control low-voltage, multistage HVAC systems that have up to three heating and cooling speeds. Use them to set an individual program for each day of the week.

Temperature Control Location Sensing—Location-sensing thermostats connect to an app that tracks the location of your mobile device. They can automatically adjust the temperature based on your distance from the thermostat. Use the app to send push notifications for service reminders, unexpected temperature changes, and interruptions to the Wi-Fi connection.

Humidity/Temperature Sensor—Thermostats with a humidity/temperature sensor also detect motion. Place the remote sensor in a room or enclosure to maintain a consistent climate. To help save energy, they can raise or lower the temperature when no motion is detected.

	Thermostats														Replacement Temperature and Humidity Sensors
	For System						Overall
	Type	Efficiency	Voltage, V AC	Current, amp	Temp. Control Type	Temp. Setting, ° F	Ht.	Wd.	Dp.	Sensor Type	Mounting Fasteners Included	Features		Each	Pkg. Qty.		Pkg.
For Air Conditioners and Heaters







				Push-Button Control

				Electric Gas Heat Pump Oil	Multistage	20 to 30	1.5	—	45 to 99	3 3/4"	5 7/8"	1"	Built In	Yes	Lockable Settings	1821K33	0000000	—	———	0




						Touch-Pad Control

						Electric Gas Heat Pump Oil Steam	Multistage	18 to 30	1	—	40 to 99	3 1/2"	4 1/2"	7/8"	Built In	Yes	Lockable Settings	1821K31	000000	—	———	0


						For Air Conditioners, Fans, and Heaters







										Touch-Pad Control with Mobile-App-Notification Alert

										Electric Gas Heat Pump Oil Steam	Multistage	20 to 30	1	Location Sensing	40 to 99	4"	4"	1"	Built In	Yes	Lockable Settings	1821K41	000000	—	———	0


										Electric Gas Heat Pump Oil Steam	Multistage	20 to 30	1	Location Sensing	40 to 99	5"	3 3/4"	1"	Built In, Remote	Yes	Humidity/Temperature Sensor, Lockable Settings	1821K43	000000	2	1821K403	0000000

Programmable Line-Voltage Thermostats

Set these thermostats to adjust the temperature at certain times each day. They regulate heaters that use direct electrical power, such as baseboard and wall heaters.

	For System								Overall
	Type	Efficiency	Program Function	Voltage, V AC	Current, amp	Temp. Setting, ° F	Switch Designation	Electrical Connection Type	Ht.	Wd.	Dp.	For Use Outdoors	Mounting Fasteners Included	Display Type		Each
For Heaters







				Push-Button Control

				Electric	Single Stage	Daily	120	16	40 to 86	SPST	Hardwire	4 7/8"	2 3/4"	7/8"	No	Yes	Digital	5294N11	0000000


				Electric	Single Stage	Daily	240	15	40 to 86	DPST	Hardwire	4 7/8"	2 3/4"	7/8"	No	Yes	Digital	5294N13	000000
				Electric	Single Stage	Daily	240	16	40 to 86	SPST	Hardwire	4 7/8"	2 3/4"	7/8"	No	Yes	Digital	5294N12	000000