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Megasteam Selection

Hey Guys ,

I need to select a Megasteam and would like opinions . My connected load is 431 square feet placing me in the middle of the 396 and the 513. Existing V7 is 1 gph at 140 psi . I'm thinking that the 396 will still be a heck of alot better than what I have but I'm not going to dispute the numbers. Thanks for replies.

hvacfreak

Mechanical Enthusiast

Burnham MST 396 , 60 oz gauge , Tigerloop , Firomatic Check Valve , Mcdonnell Miller 67 lwco , Danfoss RA2k TRV's

Easyio FG20 Controller

Comments

  • SWEISWEI Posts: 7,356Member
    How well insulated are the pipes?
  • hvacfreak2hvacfreak2 Posts: 474Member
    Everything is 1 inch fiberglass that I can get to. I have some aluminum jacket for everything but I have not got that on yet.
    hvacfreak

    Mechanical Enthusiast

    Burnham MST 396 , 60 oz gauge , Tigerloop , Firomatic Check Valve , Mcdonnell Miller 67 lwco , Danfoss RA2k TRV's

    Easyio FG20 Controller

  • Robert O'BrienRobert O'Brien Posts: 3,135Member
    The smaller one, the 33% pickup will more than cover the difference
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • Dave0176Dave0176 Posts: 1,053Member
    The MST396 will be perfect........
    DL Mechanical LLC Heating, Cooling and Plumbing 732-266-5386
    Specializing in Steam Heating, Serving the residents of New Jersey
    https://heatinghelp.com/find-a-contractor/detail/dl-mechanical-llc

    https://m.facebook.com/DL-Mechanical-LLC-315309995326627/?ref=content_filter

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  • hvacfreak2hvacfreak2 Posts: 474Member
    Thanks for the replies.

    Question : Pick up factor of 1.33 and 431 sq. ft. gets me to 137 MBH . The MST 396 is rated at 127 MBH DOE . Is this difference acceptable ? The MST 513 is rated at 164 DOE .
    hvacfreak

    Mechanical Enthusiast

    Burnham MST 396 , 60 oz gauge , Tigerloop , Firomatic Check Valve , Mcdonnell Miller 67 lwco , Danfoss RA2k TRV's

    Easyio FG20 Controller

  • FredFred Posts: 7,907Member
    You should be fine. The MST 513 is going to put you at almost 20% oversized on rated EDR PLUS the 33% additional pick-up factor. The MST 396 will still leave you close to 20% pick-up factor.
  • ChrisJChrisJ Posts: 9,877Member
    MST396 without a doubt.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • hvacfreak2hvacfreak2 Posts: 474Member
    Thank you very much , 396 it is.
    hvacfreak

    Mechanical Enthusiast

    Burnham MST 396 , 60 oz gauge , Tigerloop , Firomatic Check Valve , Mcdonnell Miller 67 lwco , Danfoss RA2k TRV's

    Easyio FG20 Controller

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