Thermostats & Installation Accessories

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Thermostats: Time-tested, safe and reliable Aube (Honeywell) and OJ Microline brands. Available in in 7-day programmable and manual (non-programmable) versions. All models include a floor sensor. 15A max. load.
TH115-AF-120S: for 120V systems only
TH115-AF-240S: for 240V systems only
TH115-AF-GA & UDG-4999: for either 120V or 240V systems, with built-in GFCI (5 mA)
Honeywell floor sensor

Floor sensors:
A single floor sensor is included with every thermostat model. It can also be purchased separately for installation as a backup (secondary sensor) or for replacement purposes. A backup is recommended for installations where sensor in embedded directly in cement instead of being installed inside a conduit. Comes with 15ft long leads.

HeatTech cable guides for floor heating cable installation

Cable Guides:
A must-have for any floor heating cable installation, this product is included free with any Cable Kit. (see HeatTech Floor Heating Cable & Kits for details).
Additional 25ft rolls can be purchased separately in this category - a single roll accommodates cable installation in approximately 50 sqft of heated floor area when cable is positioned at 3" spacing.

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Choosing the right thermostat


Installation of a HeatTech electric floor heating system requires class "A" GFCI to be present. First option is to have a circuit breaker with built-in GFCI. Second option is to purchase a thermostat which has a built-in GFCI. Third option is to have a GFCI on both devices - this provides the maximum protection in humid and often wet environments such as bathrooms, kitchens, etc.
TH115-AF-120 and TH115-AF-240 are non-GFCI (regular) models and are for use with 120V and 240V radiant floor heating systems respectively.
TH115-AF-GA and UDG-4999 are dual voltage (120/240V) compatible thermostats with built-in 5mA GFCI.
Read more about floor sensing thermostat types here.

Maximum load

15 Amps is the combined maximum load allowed for use with thermostats listed.
For 120V systems, this means 150 square feet of heating mats or 600 linear ft of heating cable.
For 240V systems - the numbers are double, i.e. 300 sqft for mats and 1200 ft for cable.


Except for the difference in voltage and GFCI availability as explained above, the following specifications are standard on 120S, 240S & GA models:
  • Programmability: 7-day programmable, 4 time settings per day
  • Mounting: Vertical only
  • Color: White
  • Display format: 12-Hour (Fahrenheit) or 24-Hour (Celsius)
  • Display features: Backlit w/ 12-seconds time-out
  • Switch positions: Ambient + Floor (AF) or Floor Only (F)
  • Operating temperature: 32F to 120F
  • Settings temperature range: 40F to 86F
  • Temporary override supported: Yes
  • Accuracy: ±1F
  • Power method: Hardwired
  • Maximum load: 15A
  • Frequency: 60 Hz
  • Wires: 6", Tinned Copper Leads
  • Fits into: 1-gang Box
  • Settings backup: Yes, Battery Not Required
  • Approvals: UL/CSA
  • Warranty: 3 Years


TH115-AF-120S and TH115-AF-240S - Installation Manual (pdf)

TH115-AF-GA - Installation Manual (pdf)

CT230-GA - Installation Manual (pdf)

Repair Kit Installation Instructions (pdf)

TH115-AF-12VDC - Installation Manual (pdf)