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Old Water Heater or Gravity Fed Hydronic?

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SENorthEast1895er
SENorthEast1895er Member Posts: 83
edited January 2023 in THE MAIN WALL
This is in my attic and i’m wondering if it’s an old water heater (where they ever put in attics?) or a remnant from when my system was switched away from gravity fed.


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  • hot_rod
    hot_rod Member Posts: 22,341
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    with a site glass it would more then likely be an expansion vessel.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    mattmia2
  • SENorthEast1895er
    SENorthEast1895er Member Posts: 83
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    Interesting. Why in the attic? Trying to figure out if I used to be gravity-fed.
  • hot_rod
    hot_rod Member Posts: 22,341
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    The highest place in the system, it added the pressure to the system and served as the expansion "space"
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • mattmia2
    mattmia2 Member Posts: 9,838
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    The system was open to the atmosphere at that tank. If it was lower in the system the water would come out.