How to Build a Mash Tun – Start All Grain Brewing!

cln_img_0338

Updated: September 26, 2024

What’s a Mash Tun?

A mash tun is a container that holds grain and warm water.  The warm water activates enzymes in the malt and converts complex carbohydrates to yeast-friendly simple sugars.

A mash tun can be as simple as a bucket. Many homebrewers convert coolers to mash tuns.  Those have the advantage of insulation. That insulation helps maintain a steady temp throughout the mash process. Kettles are also regularly used as mash tuns and there are also some purpose built stainless mash tuns. An example of that is Ss Brewtech’s InfuSsion Mash Tun.


Limited Time Deal on 14 Gallon Mash Tun!

kegland mashtun deal

From MoreBeer:

If you’ve been thinking about making the move to all-grain brewing, now’s the perfect time! Exclusively for our email subscribers, you can SAVE 35% on a 14-Gal Cooler MT/HT – but only while supplies last!

Why we love these: Many of us at MoreBeer! started our all-grain brewing journey with one of these cooler mash tuns, winning numerous awards with them along the way. They’re reliable, easy to use, and maintain temperature in almost any condition. When we think of these mash tuns, terms like tried and true and old-school cool come to mind.

Insulated Cooler Mash Tun | Hot Liquor Tank | 14 gal. AG336use coupon code MTHT35 to get the deal!


Components of a Mash Tun

  • A container – Examples: bucket, cooler, kettle, keggle or a purpose built vessel
  • Filter device/mechanism – Examples: false bottom, bazooka screen
  • Ball valve and tubing
  • Optional – sparge arm, thermometers


This article contains affiliate links. We may make a small percentage if you use our links to make a purchase. You won’t pay more and you’ll be supporting Homebrew Finds and more content like this. Thank you for your support!


Coolers to Consider

  • 10 Gallon Igloo Cooler – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link
  • Igloo 10-Gallon Seat Top – via Wal-Mart
  • Coleman 48 Quart Cooler – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link

A key feature to look for when considering a cooler to convert to a mash tun is a built in drain.  It’s possible to drill a hole in some coolers, but it’s generally, much easier if the cooler has a drain.


cln_img_0292


Mash Tun Conversion Kits

False Bottoms

Ready Made All Grain Brewing Setups

Insulated Cooler Mash Tun | Hot Liquor Tank | 14 gal. AG336

Popular (and Simple Design) via Denny Conn and the AHA:

How to Build a Mash Tun

This setup is based on Denny Conn’s great design.  Denny is a legendary homebrewer. Among other things, he is the co-author of Experimental Homebrewing and the keeper of Wyeast 1450 Denny’s Favorite 50.  Check out Denny’s Author Page on Amazon see more of his books.

See the AHA’s Article on this: How to Build a Mash Tun – via the American Homebrewer’s Association

Related:

  • Coleman 48 Quart Cooler – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link
  • Rubber Mini Keg Bung – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link

cln_img_0353Taking mash temp with my Thermapen.  Notice the backlit, rotated display.


Or… Brew BIAB Style

BIAB uses a low cost cloth bag as a filter.  This allows you to brew all grain beer using a single kettle.  It’s easy and cheaper to get started vs a dedicated all grain setup.

Do You Need a HLT?

A hot liquor tank is a container that holds hot or warm sparge water.

Many of the cooler all grain system systems on the market include two coolers.  One functions as a Hot Liquor Tank (HLT) the other as a Mash Tun (MLT).  If you’re a batch sparger, you may be able to get by with one cooler if by using a spare kettle for your hot liquor tank (HLT).  When I first went to all grain, I used my 5 gallon extract kettle to piggy back the first runnings.  Doing this allowed me to temporarily use my boil kettle as a HLT.

It worked something like this…

  • Heat strike water in boil kettle
  • Drain strike water into cooler mash tun and mash
  • Heat sparge water in boil kettle
  • Recirculate and drain first runnings into 5 gallon extract kettle
  • Empty sparge water into cooler mash tun
  • Dump first runnings from 5 gallon kettle into boil kettle
  • Recirculate and drain second runnings into boil kettle
  • Boil!

Obviously, this is batch sparge method.  This method would not work with fly/continuous sparging.  If you are fly sparging… you need a dedicated HLT.

Having a dedicated HLT is preferable, but this piggy back method got me started in all grain at a reasonable cost until I could pick up another kettle.

Get a Deal on Bulk Grain

deals on sacks of malt

Grain Storage!

Check Out These Related Reviews

Everything All Grain!

Our resource post on all grain is the source for everything all grain!

More Homebrew Finds!

Recent Deals!

10 Most Recent Homebrew Resource Posts & How-To’s!

We are Homebrew Review HQ!  Our 10 Most Recent Reviews

pinned

This post may contain affiliate links. We may make a commission when you use our links. This will never cost you extra. Thank you for supporting Homebrew Finds!

greatdeals

Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions. tag:lnksfxd toppost:makingamashtun tag:tpr

9 thoughts on “How to Build a Mash Tun – Start All Grain Brewing!

  1. David K

    How is the street elbow attached to the false bottom? I tried to upgrade mine last night with a street elbow and had to rig it together. Is there some sort of hollow male threaded bolt that screws into the elbow clamping it down to the false bottom?

    Reply
  2. EG

    I have the same exact cooler and conversion kit, and my dead space is around a pint (not a quart), as long as I don’t lose siphon. When you drained it did you attach a tube that emptied below the level of the valve?

    Reply
    1. admin Post author

      Interesting. Thinking about the siphon effect… I did use a tube when doing this test. It had a drop of 2 or 3 feet (from my table to a keg sitting on the floor). In the interest of getting a reasonable and realistic result, I did not tip the cooler in any way. That would probably help to get more liquid out. That’s something I would probably do on most brew days. Beyond that.. I’m trying to think of what the difference would be.

      Reply
        1. admin Post author

          Great question David. I’ve added that to the review. I’d say 1/4″ gallon would be a great figure.

          Reply

Leave a Reply