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Viessmann Vitodens 100 WB1B-35 Burner Screws

Steve_166
Steve_166 Member Posts: 10
in THE MAIN WALL
Was wondering if anyone new exactly what size the four torx screws that hold the burner on are. I know the manual says they are Torx T-30 but not sure of the thread or length. Viessmann does not have a part number nor any further info. My local rep gave me a bag that he got at Blowe's but I don't have confidence in the quality (would really be a pisser to have them snap off). The screws he gave me are Metric M6-1.00 x 12 stainless steel Philips head bolts. He told me to try them, he believes they should work. I found some online with Torx T30 heads that are Marine Stainless A4-80 grade but would like to make sure I have the right size before I order them.

Comments

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,217
    That's a tough one. Not even the parts catalog identifies them.

    Maybe @GGross can help.


    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    Steve_166
  • GGross
    GGross Member Posts: 1,295
    Are these the screws that are inside the unit, that attach the burner tube to the burner plate? or the screws that hold the burner door/plate to the heat exchanger?
    Steve_166
  • GGross
    GGross Member Posts: 1,295
    If it's the screws that attach the burner to the burner door here are some photos. they do come with a new burner tube assembly if you decide you need to make sure they are correct. Its kind of strange to need all 4 of these and not have one for reference though? mind sharing what happened?







    Steve_166
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,507
    Why not just take one out and try the ones you have? That will tell you if you have the correct thread.
    Steve_166
  • hot_rod
    hot_rod Member Posts: 23,422
    edited March 14
    You can buy a whole kit of stainless metric bolts of any head configuration on Amazon for not much$$
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Steve_166
  • Steve_166
    Steve_166 Member Posts: 10
    edited March 14
    Appreciate all the input. They are the screws that hold the burner door/plate to the heat exchanger. Every other year I do more than just check parameters on the exhaust (I call that a Level 1 Cleaning) for customers and actually pull it apart and clean the heat exchanger (Level 2 Cleaning). Over the years those Torx screw heads start to feel like they are wearing out. Want to change them before I have an issue. Now that I have some, I will check to see if they fit and order the stronger ones to actually install. Was just hoping someone had replaced these and knew the size so I can install the stronger ones the 1st time.
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,217
    edited March 14
    We've done quite a few of the warranty heat exchanger replacements (model B2HB) and they provide replacement screws that we save and would be happy to send you some if you need them. I believe they are the same as on your WB1B. Just PM me your address.

    They often spall when removing or installing and we replace with Locktite Anti-Sieze on the threads.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    GGross

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