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Thread: 2 wire vs 3 wire thermostat

  1. #1
    DIY Junior Member d_butka's Avatar
    Join Date
    Oct 2004

    Default 2 wire vs 3 wire thermostat

    I have Oil fired hot water baseboard heat, with 2 zones. I have wanted to install a programmable thermostat, but I cannot find one that works with 3 wire aquastat.
    What is the difference between 3 wire & 2wire thermostats?
    Is there a way for me to adapt a prog therm. for use in 3 wire system?

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default t'stat

    It has been over 30 years since I worked on wet heat, but I do not ever remember needing a three wire thermostat for just heating purposes. Usually the aquastat has two terminals and the thermostat just switches them on or off.


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