Should the boiler fill pipe feed off the hot water coming out of heater?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Alph, Jan 10, 2013.

  1. Alph

    Alph New Member

    Joined:
    Jan 10, 2013
    Location:
    Bethesda, MD
    Hello. Long-time lurker, first-time poster.

    I have a question about the piping of the water feed into a residential boiler (a two-pipe, hot-water system with cast-iron radiators; not steam).

    I had a plumber install a hot water heater for me a couple of months ago. Its turned out that there's some things that he did that were completely wrong. (I'll post some pictures when I get a chance.)

    Something that I just noticed is that as a result of how he piped things, the water feed pipe that would be used to fill up the boiler comes off of one of the hot water lines that comes OUT of the hot water heater. Before that plumber, the boiler feed pipe came off of the cold water line before it fed water IN to the hot water heater.

    Does it make a difference if the water feed into the boiler is off of a hot water pipe or a cold water pipe? Have I been wasting gas needlessly heating water that goes into the boiler? Are there some rules or guidelines for the best ways to layout the boiler feed pipe?

    Thanks,

    Alph
     
  2. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    Location:
    Maine
    It should be off the cold but off the hot wont hurt anything
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Unless the heating system has a leak, there should be very little, if any, water being fed into it once it is full, so you are not losing any energy heating it.
     
  5. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

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    Houston, Texas, United States
  6. Alph

    Alph New Member

    Joined:
    Jan 10, 2013
    Location:
    Bethesda, MD
    thanks for the tip!
     
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