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T6 Pro Hydronic Programmable Thermostat can be used to control hot water heat systems by sensing the ambient air temperature, floor temperature, or both. Wired floor sensor included.


  • 7-day, 5-2, 5-1-1 or non-programmable
  • Hot water and steam, up to 1H only
  • Can be set to operate in one of 3 different control modes, including A, F, and AF
  • Floor sensor included
  • Remote indoor air optional
  • Uses the UWP mounting system that’s standard across all T Series thermostats
  • Simple push-button functionality
  • Adaptive Intelligent Recovery
  • 5-year warranty

Product Specifications

Hot water heat only with floor sensor
Dimensions (in.)
4-1/16 in. long x 4-1/16 in. wide x 1-3/32 in. deep
Dimensions (mm)
103.6 mm long x 103.6 mm wide x 28 mm deep
Thermostat, UWP mounting system, Installation (J-box) adaptor, AQ12C20 floor sensor
Item Type
UWP Mounting System
Electrical Ratings
20 to 30 Vac
50 Hz; 60 Hz
Up to 1 heat only. Hot water, and steam.
Electrical Connections
Honeywell UWP Mounting System
Operating Humidity Range (% RH)
5 to 90% RH, non-condensing
Supply Voltage
20 to 30 Vac
Switch Positions (System)
Switch Positions (Fan)
Operating Temperature Range (F)
37 F to 102 F
Operating Temperature Range (C)
2.7 C to 39 C
Shipping and Storage Temperature Range (F)
- 20 F to 120 F
Shipping and Storage Temperature Range (C)
- 28.9 C to 48.9 C
LED Back Light
Power Method
Battery or Hardwired
Ambient Temperature Range (C)
0 C to 50 C
Ambient Temperature Range (F)
32 F to 120 F
Large Display, Soft Key Controls
Accuracy (F)
1 F
Accuracy (C)
0.5 C
Differential Temperature (F)
± 1 F
Differential Temperature (C)
± 0.5 C
Switch Type
7 day, 5-1-1 day, 5-2 day, or Non-programmable
Display Size
5.44 sq. in.
Temperature Control Mode Selections
Ambient Air Temperature
Heat only
Setting Temperature Range (F)
Heat: 40 F to 90 F
Setting Temperature Range (C)
Heat: 4.5 C to 32.0 C
Heat Current
0.02-1.0 A
External Sensors Available
Floor sensor (included) AQ12C20; Remote Indoor air (optional) — C7189U1005
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