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maximum water temperature in hydronic boiler

hot_rod
hot_rod Member Posts: 23,421
in THE MAIN WALL
I know many of the components have max. operating temperatures 225F maybe on circs and some of the safety devices and controls? Usually it is listed on the component or the data sheet.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream

Comments

  • jim_164
    jim_164 Member Posts: 1


    what is the practical maximum high limit setting on a hot water boiler? normally a hi limit is 180 but I'd like to know what the safe maximum is.
  • Dale
    Dale Member Posts: 1,317
    by code

    And definition it's 240 degrees for a "low temp" boiler, seems strange but in the old days 1970's the boiler radiator trade group used to have classes in "mini tube" systems using hot water over boiling temp. Sizing was 3/8 tubing. This is why the old hi limits go to 240. Seems scary but think of your car radiator and look at a modern car temp gauge.














  • Al Letellier_21
    Al Letellier_21 Member Posts: 402
    high temp

    Normal high temp here in Maine is 200 but as in the other posts, some systems run higher. The downside....if that water over 212 gets out, it's live steam and people get hurt that way !!!

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