Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Remote Zone Valves

Brent H.
Brent H. Member Posts: 162
In my addition, I'd like to have 2-3 zones. The problem is that the run to the addition from the boiler is approx. 50+ feet which adds up to a whole lot of pipe. One of my thoughts was to run one 3/4" supply and return and locate the zone valves in the basement of the addition. The total heat loss is about 25K BTU so this seems like it should work. Any thoughts?

Thanks in advance.

Comments

  • billtwocase
    billtwocase Member Posts: 2,385


    Brent, You would want atleast 1" pipe, also consider black iron? Alittle cheaper per foot, although copper has finally stabilized. peace
  • Brent H.
    Brent H. Member Posts: 162
    Why 1\"

    Why 1".... seems like I should be able to 25K BTU through 3/4"?

    Also, I'm planning on using Fostapex.
  • billtwocase
    billtwocase Member Posts: 2,385


    That's a long run Brent, and you are running 2 zones off that common feed and return. If it was 1 zone ok, but 2, personally i'd upsize
  • Brent H.
    Brent H. Member Posts: 162
    Thanks for the feedback

    I now understand your concern.

    I'm trying to avoid 1" since I don't have the crimpers for it and was hoping to avoid buying them :)

    I'll have to see if I can find someone with the tools to help me out.
  • billtwocase
    billtwocase Member Posts: 2,385


    Welcome Brent. If it was 1/2 that run, i'd say go 3/4 with 2 1/2" zones, but the 50 foot thing with 3/4 feeding 2 3/4 zones, it would eventually work if both zones were heating at the same time. Good luck to you
  • hot_rod
    hot_rod Member Posts: 23,242
    Here are some calcs

    I'd say 3/4 would handle the job, assuming water as the fluid? 5/8 is right on the line with 7 feet of head per 100 feet.

    Too much pipe diameter can lower the velocity, making air removal more of a challange. Try to stay above 2 fps when pipe sizing for hydronic purposes.

    hr
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Brent H.
    Brent H. Member Posts: 162
    Quick followup

    A somewhat unrelated followup....

    Is it necessary to use plastic isolators/sleeves where PEX passes through floor joists?

    Thanks.
  • MikeyB
    MikeyB Member Posts: 696
    pipe size

    HR, is that diagram from one of John S. (Siggy's) program?
  • hot_rod
    hot_rod Member Posts: 23,242
    HDS Hydronic Design Software

    www.hydronicpros.com
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
This discussion has been closed.