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rads not heating

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keith_27
keith_27 Member Posts: 64
two rads on the second floor will not heat ?? piping is there at end of main but looks like the riser pipe was capped when the new kitchen was done a few years ago. my opinion it should have a main vent . the other main works fine and has a #75 vent on

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  • Fred
    Fred Member Posts: 8,542
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    Tell us a little more. Does this main not have a vent? The picture doesn't show a capped pipe. Was the vertical riser where a kitchen radiator was removed?
  • keith_27
    keith_27 Member Posts: 64
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    no vent on this main. the riser pipe is 3/4 in that is what is capped like this is were a vent was. ??
  • Fred
    Fred Member Posts: 8,542
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    If it's at the end of the main and after the last radiator run-out, yes, it is where a vent should be. Make sure the vent you put on there is large enough to vent the air quickly.
  • keith_27
    keith_27 Member Posts: 64
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    fred can i change the riser pipe nipple to be able to install a hoffman #754.
  • nicholas bonham-carter
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    Use a bigger Gorton #2 or bigmouth, for more capacity on each main. The burner won’t run so long squeezing the air out of constipated little vents like the Hoffman 75.—NBC