Item # TL8100A1008

Honeywell's TL8100 Hydronic Thermostat offers the energy savings of a programmable control for a wide variety of applications. It can be used to control 2-way zone valves, 3-way zone valves or circulator pumps in both line volt and low volt applications. It also offers special protection modes to prevent system seizures and to reduce callbacks.

Features and Benefits
  • 7-Day Programmable - Up to 4 periods per day to fit any lifestyle and help save energy.
  • Precise Comfort (+/-1ºF) - Maintains consistent comfort to the highest level of accuracy.
  • Installation Flexibility - Works with mV, 24V, 120VAC, and 240VAC heating systems. Rated at 5A resistive and 2A inductive load.
  • Pump Protection - Activates zone valves or pumps for one minute every 24 hours to prevent seizures and reduce callbacks.
  • Armchair Programming - Save time on the job with convenient programming by simply removing the faceplate from the base.
  • Low Battery Indicator - Gives 60-day warning to replace batteries. (Batteries Included)
Product Specifications
7 Day program/ 1 Heat
4.9" x 3.8" x 1"
Operating Temperature Range
32°F to 122°F
Sensor Element
Terminal Designations
R, W, (X, C, optional remote input)
Electrical Ratings
Maximum Load: 5 A (resistive), 2 A (inductive) @ 24 Vdc, 120 Vac, 240 Vac; Compatible with millivolt systems
Supply Voltage
24 Vdc; 30 Vdc; 120 Vac; 240 Vac
Power Method
2 AA batteries included
Electrical Connections
Screw Terminals


5418 Elmwood Ave | Indianapolis IN 46203 | 888-652-9663