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frozen radiators

reddogreddog Posts: 9Member
does anyone know what temp it would take (F) to crack a full radiator? in a house with no heat outside temp is what I mean


  • Ron SchroederRon Schroeder Posts: 998Member
    It can crack @ 32 degrees given enough time

    @ 0 I bet not more than a couple hours, hard to say time vs temp. Not to fotget big tubes vs thin tubes all play a part
  • Brad White_39Brad White_39 Posts: 18Member
    It is not the outside temperature it is the inside temperature

    that counts. If it stays above 32F inside you should be OK. Even if you have no heat can you at least run the circulator? Jumper it if you have to.

    Moving water will not freeze easily.
  • Ron SchroederRon Schroeder Posts: 998Member
    Missed the outside temp

    But unnless you had a few days of no sun I have seen in the lower twenties with no problems. Then again how drafty ius the building??
  • reddogreddog Posts: 9Member

    thanks for your feed back...... a friend said 2 radiators had blown out from freezing in a vacant house...... I didn't think that 20 degrees as an outside temp for 2 days would cause that...... do you agree?
  • JB_8JB_8 Posts: 85Member

    It takes a few days for a house to cool down, but if the window is open all bets are off
  • Brad White_39Brad White_39 Posts: 18Member
    I cannot argue with your friend's reality

    Cannot settle that bet; his radiators froze or they did not. Who am I to say otherwise?

    But if freezing is that much of a concern, drain the system while you are waiting for repairs. Do that only if you cannot run the circulator. Try that first.
  • Ron SchroederRon Schroeder Posts: 998Member

    If the circ isn't running and you have a place that a draft blows on a pipe it will freeze in turn trapping water in the radiator until it reaches burst point, it might not freeze solid but enough to crack. Most time you will see where water ran across the floor and froze it just takes a small serction of ice to crack a ci radiator.
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