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A coolship (Anglicized version of the Dutch/Flemish koelschip) is a type of fermentation vessel used in the production of beer. Traditionally, a coolship is a broad, open-top, flat vessel in which wort cools.[1] The high surface-to-mass ratio allows for more efficient cooling.[2] Contemporary usage includes any open fermentor used in the production of beer, even when using modern mechanical cooling techniques. Traditionally, coolships were constructed of wood, but later were lined with iron or copper for better thermal conductivity.

While Anchor Brewing Company is the oldest continually-operated brewery in the United States to employ open fermentation, coolships in the traditional sense[3] were first used in the United States by Allagash Brewing Company.

Several craft breweries in North America have followed, including:

On October 12, 2017, Two Roads Brewing Company commenced construction of a second facility which will be dedicated to experimental brewing and will house a coolship.[14]


  1. ^ "Coolship". Retrieved 21 September 2013.
  2. ^ "Anchor Terminology: Coolship". Anchor Brewing Company. Retrieved 21 September 2013.
  3. ^ "Coolship Lands at Allagash Brewing Company". Retrieved 21 September 2013.
  4. ^ "Sherry Barrel Western Culture • American Solera". American Solera. 2016-07-20. Retrieved 2018-11-20.
  5. ^ Roberts, James. "The coolship is landing". Anchorage Press. Retrieved 25 September 2013.
  6. ^ "Facebook". Retrieved 2016-04-26.
  7. ^ "Our Process - Dovetail". Dovetail. Retrieved 2018-09-06.
  8. ^ "Hill Farmstead Q&A With Shaun Hill". Embrace The Funk. 2012-05-01. Retrieved 2018-11-20.
  9. ^ "Monkish Brewing Co". Retrieved 2018-11-20.
  10. ^ "Pen Druid Brewing on Instagram: "Oh hell yeah! Coolship #1"".
  11. ^ "Primitive beer on Instagram: "Every beer we make starts out the same! Turbid mash, aged hops, marathon boil, and a night in the koelschip (pictured)"".
  12. ^ "How does a Beer become Sour? | Rivertown Brewery and Barrel House". Retrieved 2017-10-12.
  13. ^ Martin, Robey (2016-04-11). "First Look: The Veil Brewing Co". Retrieved 2018-11-20.
  14. ^ Co, Two Roads Brewing. "Two Roads Brewing Co - Stratford, CT". Retrieved 2017-10-13.