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low loss header

Couderay Member Posts: 314
Was wanting to build a low loss header for my boiler,does the header need internal baffles for it to work properly.


  • Uni R_2
    Uni R_2 Member Posts: 589
    It depends...

    Sometimes it makes for good marketing. ;-)
  • ALH_4
    ALH_4 Member Posts: 1,790

    I tend to think no. Though if you have an automatic air vent in the top I could see a baffle helping air removal. Viessmann offsets their ports instead of a baffle. Caleffi uses a baffle instead of offsetting their ports. If you are zone pumping, I would offset the ports by one pipe diameter. If you are using zone valves, it makes less difference.

  • Perry_2
    Perry_2 Member Posts: 381
    From an engineering standpoint

    You are looking at a "direct contact" heat exchanger. They work best if you do something to create a mixing environment. While their are a variety of solutions... If you want a short Low Loss Header you can either use baffles or offset nozzles to create a mixing environment.

    So pick your poisen as it best matches your situation.

    Best of luck.

    One question to consider - can you really build one cheaper than you can buy one - when you consider time and materials? The Viesmann one comes with all the ports, a temperature sensor port, vent port, drain port, and you can even get an insulation package.

  • hr
    hr Member Posts: 6,106
    Offset or

    some sort of screen. I like the Caleffi approch with a perforated metal screen, it creates a good mixing mechanism as well as aiding in air seperation. Plus some ability to catch and drop dirt or debris out of the flow.

    I also like the nice preformed insulation jacket for the Caleffi Hydro Seperators, and it is now available with sweat unions.

    I'd think ports directly across from one another, without a baffle, would be least desireable.

    hot rod

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