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    not2bscam's Avatar
    not2bscam Posts: 1, Reputation: 1
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    #1

    Mar 1, 2007, 11:22 PM
    Changing 2 wired thermostat
    Our old thermostat for the heater has 2 wires only. They are both black. The new thermostats have 3 or more colored wires. What should we buy to replace our now broken thermostat that is easy to install without calling an electrician to change the wiring?:eek:
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Mar 1, 2007, 11:56 PM
    For heat only, just connect one black wire to the R or RH terminal and the other to the W. Might be better if you identified the hot and connected it to the R, but not that important.
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