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Searching for a Digital Line Voltage Thermostat

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One of my customers has an older radiant system with two wires to his thermostat - line in and load out. No neutral wire.

He wants to change to a non-programmable, digital thermostat and I can't find any available that don't need to be powered, i.e. a neutral wire. So, it will be battery powered, but I can't find any. Suggestions appreciated.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab

Comments

  • ratio
    ratio Member Posts: 3,696
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    Is there a ground in the box...
  • HVACNUT
    HVACNUT Member Posts: 5,886
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    I'm not sure if they're still available, or even the same name, but Lux had a digital line volt (120 or 240 volt) that took AA batteries for switching. No neutral needed. 
    The ones I used were programmable though.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,827
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    Honeywell has an electric heat thermostat digital that worked on 240 volt. Not sure about 120 volt and it's programmable
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,827
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    How about a non programmable 24 volt stat add a transformer and a relay. You could use the 120volt cable and pigtail on some 24 volt cable
    realliveplumber
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,102
    edited October 2023
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    Is there a ground in the box...
    No

    How about a non programmable 24 volt stat add a transformer and a relay. You could use the 120volt cable and pigtail on some 24 volt cable
    Yes, that's plan B.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • dko
    dko Member Posts: 642
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    LuxPro PSPLV512
    pro.luxproducts.com/psplv512/

    it is programmable, but I don't think there is another option out there- at least name brand.
    but simple enough design to not be bothered by programmable controls
  • Alan (California Radiant) Forbes
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    Thanks @dko and @HVACNUT! That's exactly what I need!
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab