| Supply Voltage | 208 Vac; 240 Vac |
| Frequency | 50 Hz; 60 Hz |
| Electrical Connections | 5.5 in. (140mm) tinned copper lead wires |
| Electrical Ratings | 15 Amps Max; 3600 Watts at 240 VAC, 3120 Watts at 208 VAC |
| Ambient Temperature | 32 F to 122 F |
| Mounting | Vertical |
| Application | Electric baseboards, convectors and fan forced heaters (resistive rated loads). |
| Dimensions | 4 7/8 in. high x 2 3/4 in. wide x 7/8 in. deep |
| UL | UL Listed 9R12, File Number: E183695 |
| CSA | cCSAus, File Number: LR76030; Compliant to CAN/CSA-C828-06 |
| Stages | 1 Heat |
| Color | Premier White® |
| Sensor Element | Thermistor |
| Switching Action | DPST |
| Programmability | 7 Day program |
| Display Size | 2.67 sq in. |
| Setting Temperature Range (F) | 40 F to 86 F |
Description
The TL8230A1003 is a line-voltage thermostat from Resideo (Honeywell Home) for electric resistance heat — baseboard, convectors, radiant ceiling or panel heaters.
Line voltage is the distinction that matters here. A low-voltage thermostat switches a 24 V control circuit and lets a furnace or boiler do the work; a line-voltage thermostat carries the full heater current itself. They are not interchangeable, and a low-voltage stat wired to a baseboard circuit fails immediately.
This is a double-pole thermostat: it breaks both legs of the supply, so the heater is fully de-energized when the thermostat is satisfied or turned off. Double-pole is what most jurisdictions require on 240 V baseboard, and it is what makes the heater safe to work on with the thermostat off.
The programmable schedule lets the heat drop back when the room is empty and recover before it is used again. On electric resistance heat, where every watt is billed at full price, setback is the single largest saving available — there is no efficiency to improve, only run time to remove.
Match the voltage and the pole configuration to the heater circuit, and check the amperage of the heater against the rating of the thermostat. A thermostat sized below the load is the most common cause of a line-voltage stat failing in its first season.
- Brand: Resideo (Honeywell Home)
- Manufacturer Part #: TL8230A1003/U
- Type: Line-voltage thermostat
- Poles: Double-pole
- Control: Programmable
- UPC: 085267262637
- Category: Line Voltage Thermostats