I'm replacing a 23 year old manual Honeywell thermostat with a new digital Honeywell thermostat model RTH111. The old thermostat has two wires (colors white and red) but no designation on the terminals. This is for a hot water baseboard gas fired boiler.
Which terminals do these unmarked wires connect to on the RTH111? The terminals are marked O/B, Y, RC, R, G, W
Thanks,
Roy