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9 units

I have 1 riser that doesnt get hot, it leaves the bioler hot runs about 90 feet before it goes vertical. Its hot until about 5 feet from the vertical pipe. Would a main vent help the problem?


  • nicholas bonham-carter
    cold riser

    what was the result of the tests we suggested you run with the radiator vents?

    main vents are definitely needed.--nbc
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