Incorrect boiler pressure relief valve installed

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

  1. masterplummer

    masterplummer New Member

    Joined:
    Feb 19, 2016
    Location:
    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

    Joined:
    Jan 14, 2009
    Location:
    01609
    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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