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Slow drop in pressure over summer months

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ChrisCS
ChrisCS Posts: 13
in Radiant Heating

Im hoping for some advice before I turn on my hydronic heating system for the season. Last winter it was about 15-17 psi when running. Now after being off for 5 months, it sits at about 11 or 12 psi. Doea this seem normal? Is it safe to turn on, or should I add a little water to the system?

Thanks for any advice.

Comments

  • bburd
    bburd Posts: 1,326
    edited 5:12PM

    Water expands when heated and contracts when it cools. 11-12 psig is normal for a cold boiler in a building of one or two stories. When the system heats up the pressure should rise back to where you noticed it last season.

    —
    Bburd
  • ChrisCS
    ChrisCS Posts: 13

    Thanks!

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