Results 1 to 5 of 5
Like Tree3Likes
  • 3 Post By TC

Thread: Is the bigger the boiler always the better the steam?

  1. #1
    Senior Member FineGrind's Avatar
    Join Date
    Jul 2012
    Posts
    116

    Is the bigger the boiler always the better the steam?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Is it a rule that the bigger the boiler the better the steam? Or do some smaller steam boilers outdo certain other larger boilers?

  2. #2
    Senior Member Lovey's Avatar
    Join Date
    Apr 2005
    Location
    South Coast NSW
    Posts
    841
    How do you mean 'better'? Are you referring to dryness or the shear capacity and ability to steam a lot of milk at once?

  3. #3
    Senior Member FineGrind's Avatar
    Join Date
    Jul 2012
    Posts
    116
    Well, dryness really.

  4. #4
    Senior Member Lovey's Avatar
    Join Date
    Apr 2005
    Location
    South Coast NSW
    Posts
    841
    I would say not necessarily. If you have a boiler in which the water level is very high, you'll get wet steam. A smaller boiler that is correctly set up may produce drier steam than a larger boiler that isn't correctly set up.

  5. #5
    TC
    TC is offline
    .
    Join Date
    Oct 2004
    Location
    Melbourne
    Posts
    14,665
    Behmor Brazen - $249 - Free Freight
    There are a heap of intangibles. A boiler might be considered as somewhat like a respiratory system:

    • size = lungs which is more or less a measure of outright puff dependent on the aforementioned boiler probe location
    • steam valve diameter = windpipe
    • holes in steam tip = mouth.

    Using this analogy, a VBM Domobar Junior has more steam pressure at the tip than a Giotto due to the bigger valve and larger holes in the tip. It runs out of puff earlier than the Giotto though. A Domobar Super has roughly 80% more puff as it has a much larger boiler and the same valves/tip. A diadema Junior- long lasting steam with a smaller 1.3L boiler and small holes in the steam tip. Still enough puff for 2 milky coffees and great for those learning.

    The other influencing factors include thermal mass of the boiler. A Duetto III (late 2013-2014 update) has heavy end plate boilers and otherwise identical anatomy to earlier Duettos. The steam is much drier than the earlier models.

    If the steam has a long run from the steam boiler you can get condensation- wetter steam. If that run is insulated in the same machine, steam quality will generally improve. Insulate the boiler for an improvement. Add teflon inserts to the wand and it changes again. A swap of wand sides (Hello The Coffee Machinist) can also improve things dramatically if a shorter run is the result.

    All as clear as mud ain't it?



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •