Tag: RTH230B

Honeywell Home RTH230B Programmable Thermostat  Introduction The RTH230B programmable thermostat can be used to control:  a gas, fuel oil or electric furnace – 2 or 3 wires  a central air conditioner – 2 or 3 wires a hot water system with or without a pump – 2 wires a millivolt system – 2 wires a…