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Tankless aquastat

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keith123
keith123 Member Posts: 103
in Strictly Steam
If repurposing a tankless coil on a steam boiler for space heating, which a Honeywell aquastat would you use

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  • mikeg2015
    mikeg2015 Member Posts: 1,194
    edited November 2019
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    I used a RANCO digital aquastat on my tankless and I’m pretty happy with it. You get adjustable differentials and it displays the current temperature. Also used one for my DHW recirculation pump.

    It was cheaper than most of the aquastats too.

    Otherwise I’d use one with an adjustable differential.
    keith123
  • Ron Jr._3
    Ron Jr._3 Member Posts: 603
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    Space heating , meaning the coil will run a separate zone ?

    I'd use a triple aquastat type if that's the case. We've been using the Hydrolevel 3450 with very little issues. You might need to add an isoltation relay to it to run with the steam zone too
    keith123
  • keith123
    keith123 Member Posts: 103
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    Separate heating zone is correct
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,836
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    L6006 or L4006 in the aquastat tapping on the coil. Set at 180 or lower. This will keep the boiler from steaming on a call from the hydronic coil zone.

    set up the circulator relay as indicated in the diagram



    1 and 2 are L1 and L2 or common

    T T is from the zone thermostat
    jump 1 to 3

    power circulator with 4 (power) and 2 (L2 or common)
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
    keith123
  • keith123
    keith123 Member Posts: 103
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    Thank you sooo much !!

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