569-0887—1
Prepare for Installation

ACheck Table 1 to make sure this thermostat is compatible with your system. For more

information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.

Table 1. Compatibility Chart.

System Type Compatible With T8131
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
a,b
Gas—Millivolt No
Oil-Fired Boilers Yes
a,b
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No

NOTE: Not compatible with any 120/240 volt circuit.

aCompatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostats for zone valves.
Not compatible with 2-wire White-Rodgers no. 1361 Valves.
bCompatible with

hot water

baseboard systems. Will not work efficiently on steam or gravity systems.