Incorrect boiler pressure relief valve installed

Discussion in 'Boiler Forum' started by masterplummer, Feb 19, 2016.

  1. masterplummer

    masterplummer New Member

    Feb 19, 2016
    Amherst, Massachusetts
    Relief valve was leaking and was badly corroded, so I planned to replace it.

    Got the new one on, and it would trip when I tried to refill the system. Discovered that I had inadvertently got a relief valve only rated for 15psi instead of 30psi like the old one.

    So my question is, what is the risk in leaving the current 15psi valve on until I can get a 30psi one? Is my boiler under filled with water; do I risk it overheating?
  2. Dana

    Dana In the trades

    Jan 14, 2009
    Even if you pre-charged the system and expansion tank to 9-10 psi there's a good chance it could exceed 15 psi, spitting water. Some low-mass boilers really need 12 psi+ to avoid flash boil, but you'll likely be able to hear the sizzle & bang well before there was actual damage being done.
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