2 wire vs 3 wire thermostat

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by d_butka, Feb 3, 2005.

  1. d_butka

    d_butka New Member

    Messages:
    2
    Location:
    Connecticut
    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. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,843
    Location:
    Cave Creek, Arizona
    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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