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Thermostat wire

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I would rather have 1 conducter too-many, than 1 not-enough!

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  • Dan_15
    Dan_15 Member Posts: 388
    Thermostat wire

    I am getting a new boiler installed in a week (System 2000), and I will be adding two zones to the two I already have. I wanted to run the thermostat wire to the boiler, and wondered how many wires I should be using (18-3, 18-4, etc...)?

    Thanks

    Rick
  • Jamie Hall
    Jamie Hall Member Posts: 26,846
    IMHO

    There is no such thing as too many wires (well... yeah, there is). At least 18-4. You may not need them now, but... it's a lot easier to do it now than later.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Dan_15
    Dan_15 Member Posts: 388
    Agreed...

    That's what I was thinking as well, since there is little difference in difficulty running an 18-5 as 18-3... Just wanted to get an idea of the minimum.

    Thanks for the quick responses!

    Rick
  • Mike L
    Mike L Member Posts: 30
    T-stat wire

    I agree with the other guys. All your going to use for heat is two of them, and if that is all I'm doing I run 18-3just so there is an extra,just in case there is a bad conducter or something. I don't usually run more than that unless there is talk of central air or something,maybe, down the road.
  • Ken Field
    Ken Field Member Posts: 123
    3 wires are useful

    Most of the new digital thermostats do not require batteries if the common wire is connected from the 24 volt power supply. I prefer that because somehow or other batteries always leak and ruin equipment. Use the third wire for the 24 volt common.

    Ken

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