Double pole or single pole line voltage thermostats?
Single pole systems have two wires and cannot turn off your heating system completely. A double pole system has four wires and can shut off your system completely. The double pole units have the ability to be turned until a clicking noise can be heard, so you are assured power is off. With a single pole system you can turn the heat down significantly instead of turning off the thermostat, so to speak. While most line voltage thermostats are designed with four wires as a double pole unit, our Honeywell T498 line voltage offers the option of 2-wire or 4-wire application.
