Jacketed Mash Tun - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns & Hot Liquor Tanks > Jacketed Mash Tun

Thread Tools
Old 05-18-2012, 12:30 AM   #1
Aug 2010
New York
Posts: 118
Liked 4 Times on 4 Posts

I am thinking about doing a jacketed mash tun to control temperature. As far as I can guess and surmise from brewery tours and limited proffessional experience this is how breweries would control temperature. It seems a lot simpler than a herms or rims system. Possibly even easier to build. Perhaps an agitator would be in line to keep things consistant. Anyone pulled this off before? The only thing holding me back is funds.

It would work like this:

There is a jacket filled with hot water surrounding the mash tun. A pump circulates hot water through the jacket back to a heated vessel full of hot water. A vfd would control the pump speed to control temperature. Manual adjustment of the pump would work, you could probably find a sweet spot with practice and not really need a controller. Although a controller would give superior control.

Reply With Quote
Old 05-18-2012, 01:57 AM   #2
tally350z's Avatar
May 2011
Tallahassee, FL
Posts: 1,288
Liked 90 Times on 75 Posts

It seems simple. However I feel making the jacket would be the expensive part, more than a herms or rims. How big are you thinking?
Toasting Tortoise Brewery
Primary - Smoked Belgium
- Burton IPA, Munich Lager, Cream Ale
Bottled - Muscadine Port, Imperial Stout

North Florida Brewers League

Reply With Quote
Old 05-18-2012, 02:10 AM   #3
conpewter's Avatar
Nov 2007
East Dundee, Illinois
Posts: 5,109
Liked 53 Times on 48 Posts

Wouldn't professional jacketed vessels be steam?

Also... if you can, just go for a cooler mash tun, they are great for holding temp, love mine.
"People should not be afraid of their governments. Governments should be afraid of their people." - V

Primary: Nothin
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash

Reply With Quote
Old 05-18-2012, 03:32 AM   #4
Nov 2009
Hamden, CT
Posts: 54

I work in an industrial lab and all the stainless vessels that are jacketed use steam. I'm not saying that it can't be done, but building the jacket would definitely be a challenge

Reply With Quote
Old 05-30-2012, 06:21 PM   #5
Hex's Avatar
Oct 2009
Granite Bay, CA
Posts: 952
Liked 28 Times on 26 Posts

I've thought a lot about this option. I figure a smaller SS Cozy Dayz pot welded within another with the bottom cut out would work--like a 15 gal welded into a 20 gal for 10 gallon batches. My system would have the jacket and pump like you describe, but also an auto stirring mechanism, and direct fire. The jacket would only maintain rest temperatures. Direct fire and auto stir for quick ramps.

As for the plastic suggestion, well, that's another topic.

Reply With Quote
Old 05-30-2012, 06:28 PM   #6
Cpt_Kirks's Avatar
Sep 2008
Lakeland TN
Posts: 3,723
Liked 47 Times on 41 Posts

It's been done. There was a thread recently where somebody had produced a jacket for a keggle. It took a LOT of sheet metal work.

Insulation, HERMS, RIMS or direct fire would be easier.

Reply With Quote
Old 05-30-2012, 06:36 PM   #7
Jun 2011
North County, San Diego
Posts: 405
Liked 20 Times on 18 Posts

Check this thread out
I have brewed 5 batches with mine and don't even lose 1 degree over 60 min. Before the conversion the regular cooler was fine, I'd only loose 1 degree during the mash, but I liked the idea of using ss plus I got an extra gal of volume. You can check out photos of mine in my gallery.

Reply With Quote
Old 05-30-2012, 06:41 PM   #8
Bsquared's Avatar
Oct 2006
San Diego
Posts: 1,851
Liked 67 Times on 59 Posts

Pro-system mashes that are jacketed for the most part use steam, and this is to raise the temp of the mash for step mashing or a mash out step. One thing to consider is that 2bbl+ systems will have a lot of thermal mass, so they retain their temperature really well during the mash. Also many pro-brewers mash for a very short time, less than 10-20min in some cases, so heat loss is not an issue. if you are using a Keg or a kettle to mash, you might be better served to just wrap some insulation around it, especially if you are doing single infusion mashes.

Though if you want to make a jacketed vessel, a jacked fermenter would be much more useful.

Reply With Quote
Old 06-09-2014, 10:41 PM   #9
Jun 2014
Posts: 1

Did you ever try to build this? I was thinking along the same lines.

Reply With Quote
Old 06-10-2014, 05:49 PM   #10
Oct 2012
Woodinville, WA
Posts: 861
Liked 124 Times on 93 Posts

My dream mashtun right now is a stainless "induction-ready" kettle with a custom induction coil that goes around the bottom AND SIDES of the kettle and that can be controlled via a BrewPi, Brew Troller or BCS system. -Super low watt heat density -VERY easy to clean and no steam generator required.

I'd also like the same for a boil kettle as the lack of internal restrictions make whirlpooling super easy and therefore hop removal super easy. -No need to clean immersion elements == the electric dream!


Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
How's this for a jacketed fermenter? harpo Fermenters 49 04-04-2015 06:57 AM
Idea for an econo jacketed conical prrriiide Fermenters 7 07-01-2011 02:59 PM
40 gallon steam jacketed kettle BasementGrowler Kettles, Mash Tuns & Hot Liquor Tanks 12 03-05-2011 12:38 AM
Steam Jacketed Kettle Question Ranger9913 Kettles, Mash Tuns & Hot Liquor Tanks 0 09-03-2010 10:15 AM
Making a steam jacketed po Matt Up North Brew Stands 4 02-27-2009 12:07 AM

Forum Jump