Honeywell TH115-A-120S/U 7-Day...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$194.74
$150.85
Honeywell TH115-A-120S/U Line volt 7-day programmable thermostat for electric heat

Honeywell TH115-A-120S/U 7-Day Programmable Line Voltage Thermostat 120V 16.7A Electric Heat Control System

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Model: TH115-A-120S/U
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$150.85
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Honeywell TH115-A-120S/U 7-Day Programmable Line Voltage Thermostat 120V 16.7A Electric Heat Control System

Advanced Temperature Control for Electric Heating Applications

The Honeywell TH115-A-120S/U delivers professional-grade temperature control for electric heating systems with 7-day programmability and 120V operation. This line voltage thermostat provides reliable control for baseboard heaters, radiant ceiling systems, convectors, and fan-forced heaters with a maximum load capacity of 16.7A resistive at 2000W. Featuring a white finish and vertical mounting design, this hardwired thermostat includes a backlit display and thermistor sensor element for precise temperature management.

Professional Features & Benefits

  • 7-Day Programming: Customizable weekly schedules provide energy-efficient operation and optimal comfort control throughout the week.
  • 16.7A Maximum Load Capacity: Handles up to 2000W at 120Vac for reliable control of high-capacity electric heating systems.
  • Advanced Temperature Control: Minimizes temperature swings with 1�F differential for consistent comfort and energy efficiency.
  • Battery-Free Backup: Maintains programming during power outages without requiring battery replacement or schedule reprogramming.
  • Early Start Function: Ensures programmed temperature is reached by the scheduled time for optimal comfort management.
  • UL and CSA Approved: Meets rigorous safety standards with Underwriters Laboratories and Canadian Standards Association certifications.
  • On-Screen Power Indicator: Provides at-a-glance verification of heating power usage for system monitoring.

Technical Specifications

  • Ambient Temperature Range C: 0 C to 70 C
  • Ambient Temperature Range F: 32 F to 158 F
  • Application: Baseboard heater; Radiant ceiling; Convector or Fan-forced Heater; Electric Heating
  • Approvals Canadian Standards Association: Approved; Compliant to CAN/CSA-C828-06
  • Approvals Underwriters Laboratories Inc: Approved
  • Comments: Remote input for telephone controller; With Backlit Display
  • Differential Temperature C: 0.5 C
  • Differential Temperature F: 1 F
  • Dimensions In: 4.9 in. X 2.8 in. X 0.9 in.
  • Dimensions Mm: 124 mm X 70 mm X 23 mm
  • Electrical Connections: 6 in. (150 mm) tinned copper lead wires
  • Electrical Ratings: Maximum Load: 16.7 A (resistive only ), 2000 W @ 120 Vac
  • Frequency: 50 Hz; 60 Hz
  • Item Type: Product
  • Mounting Method: Vertical
  • Operating Temperature Range C: 0 C to 50 C
  • Operating Temperature Range F: 32 F to 120 F
  • Power Method: Hardwired
  • Product Color: White
  • Programmability: 7 Day program
  • Sensor Element: Thermistor
  • Setting Temperature Range C: 5 C to 30 C
  • Setting Temperature Range F: 40 F to 86 F
  • Supply Voltage: 120 Vac 15A
  • Switch Classification: Epoxy-soundproofed relay
  • Switching Action: SPST
  • Used With: Aube CT240/CT241 Telephone Controller

Professional Applications

  • Residential Electric Heating Systems
  • Commercial Baseboard Heating Control
  • Radiant Ceiling Heating Applications
  • Multi-Unit Properties with Electric Heat
  • Professional Offices with Zone Control
  • Retail Establishments
  • Light Industrial Heating Control

Why Choose Honeywell Quality?

Honeywell thermostats deliver proven reliability with UL and CSA certifications ensuring safety and performance standards. The epoxy-soundproofed relay switching and thermistor sensor technology provide long-term durability and precise temperature control for professional electric heating applications.

Manufacturer Resources

Product Specs

Ambient Temperature Range C :
0 C to 70 C
Ambient Temperature Range F :
32 F to 158 F
Application:
Baseboard heater; Radiant ceiling; Convector or Fan-forced Heater; Electric Heating
Approvals Canadian Standards Association:
Approved; Compliant to CAN/CSA-C828-06
Approvals Underwriters Laboratories Inc :
Approved
Differential Temperature C :
0.5 C
Differential Temperature F :
1 F
Dimensions In :
4.9 in. X 2.8 in. X 0.9 in.
Dimensions Mm :
124 mm X 70 mm X 23 mm
Electrical Connections:
6 in. (150 mm) tinned copper lead wires
Electrical Ratings:
Maximum Load: 16.7 A (resistive only ), 2000 W @ 120 Vac
Frequency:
50 Hz; 60 Hz
Item Type:
Product
Mounting Method:
Vertical
Operating Temperature Range C :
0 C to 50 C
Operating Temperature Range F :
32 F to 120 F
Power Method:
Hardwired
Product Color:
White
Programmability:
7 Day program
Sensor Element:
Thermistor
Setting Temperature Range C :
5 C to 30 C
Setting Temperature Range F :
40 F to 86 F
Supply Voltage:
120 Vac 15A
Switch Classification:
Epoxy-soundproofed relay
Switching Action:
SPST
Used With:
Aube CT240/CT241 Telephone Controller

Honeywell TH115-A-120S/U – Frequently Asked Questions

1) How many watts of electric baseboard can one TH115-A-120S/U line voltage thermostat control?
Up to 2000 W at 120 Vac, with a maximum load of 16.7 A resistive only. That covers a single run of baseboard or a small group wired together, so long as the total nameplate wattage of everything on that circuit stays at or under 2000 W. The rating is resistive only, so it is not a control for motor loads. Add up the heaters on the circuit first; a long wall of baseboard often exceeds this on one stat and needs to be split or run through a relay.
2) Does the Honeywell TH115 line voltage thermostat need a neutral or a C wire?
Neither. It is hardwired and powered directly off the line voltage heating circuit, landing on 6 inch (150 mm) tinned copper lead wires. There is no low voltage transformer, no C wire, and no batteries to change; the program is retained through a power outage without battery backup. Leave enough conductor in the box to make up the splices to those 6 inch pigtails.
3) Will this Honeywell thermostat fit a standard single gang electrical box?
The TH115-A-120S/U measures 4.9 x 2.8 x 0.9 in. (124 x 70 x 23 mm) and mounts vertically. Body depth behind the plate is shallow at 0.9 in. overall, and the connection is six inch pigtails rather than screw terminals, so the box needs room for three or four wire nuts behind it. Plan the mounting orientation as vertical; the display and controls are laid out for that.
4) What temperature range can tenants set on the TH115-A-120S/U, and can I count on tight control?
Setpoint range is 40 F to 86 F (5 C to 30 C), with a 1 F (0.5 C) differential off a thermistor sensor. That tight differential is why it holds a room closer than a bimetal line voltage stat, which is the practical difference a property manager feels in a unit with baseboard heat. Switching is SPST through an epoxy-soundproofed relay, so it does not click audibly in a quiet bedroom or office.
5) Can I control this Honeywell line voltage thermostat remotely for a vacation rental or unoccupied unit?
Yes, through a remote input for a telephone controller. It is designed to work with the Aube CT240/CT241 telephone controller, which is the accessory that gives you off-site setback and recovery for a cabin, seasonal rental, or a vacant unit on electric heat. Without that controller the thermostat is a standalone 7-day programmable, not a networked device.
6) Is the Honeywell TH115-A-120S/U UL and CSA approved for a commercial installation?
Approved by Underwriters Laboratories and by CSA, with compliance to CAN/CSA-C828-06. That C828 listing is the Canadian performance standard for line voltage room thermostats and is what an inspector or an energy code submittal on a multi-unit electric heat project will ask for. Useful if you are standardizing thermostats across a building and need one part number that satisfies both sides of the border.
7) Can the TH115-A-120S/U run radiant ceiling heat, or is it only for baseboard?
Both. Rated applications are baseboard heaters, radiant ceiling, convector or fan-forced heaters, and electric heating generally. The limit is the load, not the heater type: 16.7 A resistive, 2000 W at 120 Vac. One caution on radiant ceiling and on fan-forced units, the rating is resistive only, so the fan motor load has to be accounted for rather than assumed to fit under the resistive number.
8) Can I install this thermostat in an unheated garage, warehouse, or mechanical room?
Operating range is 32 F to 120 F (0 C to 50 C), so the space has to stay above freezing for the thermostat itself to run. Storage and shipping ambient is wider, 32 F to 158 F (0 C to 70 C). A garage or warehouse that drops below freezing when the heat is off is outside the operating window, and a spot near the ceiling in a hot industrial bay can push the upper end.
9) Will the 7-day program survive a power outage on the TH115 thermostat?
Yes, and without batteries. Programming is retained through an outage with battery-free backup, so nobody has to walk the building reprogramming stats after a storm, and there is no battery replacement cycle in the maintenance schedule. That matters most on multi-unit electric heat where the alternative is a service call per door.
10) What does the TH115-A-120S/U look like on the wall, and will it match the other devices in the unit?
White finish, mounted vertically, with a backlit display. Dimensions are 4.9 x 2.8 x 0.9 in., so it sits taller than a standard toggle plate and is noticeably larger than a plain white mechanical line voltage stat if you are swapping only some rooms in a unit. If you are standardizing appearance across a floor of apartments, plan on changing them all rather than mixing.
11) Which exact Honeywell part number do I order for the 120V 7-day line voltage electric heat thermostat?
Honeywell TH115-A-120S/U is the manufacturer part number, a 7-day programmable line voltage thermostat, hardwired, 120 Vac, white. The 120S in the designation is the voltage, which is the digit that separates it from the rest of the TH115 family, so quote it in full when ordering for an electric heat job.
12) Does this Honeywell thermostat work on 50 Hz power for an export or overseas job?
It accepts both 50 Hz and 60 Hz. The constraint is the supply voltage, 120 Vac, not the frequency, so on a 50 Hz system the circuit still has to be 120 volts and the connected heating load still has to sit within 16.7 A resistive at 2000 W.
How fast can I get the Honeywell TH115-A-120S/U delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Honeywell TH115-A-120S/U come with a warranty?
Absolutely. The Honeywell TH115-A-120S/U is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Honeywell TH115-A-120S/U?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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