4 BBL Mash Tun

4 BBL Mash Tun

A 4 BBL Mash Tun is a critical piece of brewing equipment used to create the sweet wort required for beer production through the mashing process. This guide provides craft breweries and homebrewers an in-depth look at 4 BBL Mash Tun selection, sizing, design, operation and maintenance.

Overview of 4 BBL Mash Tuns

A mash tun is a vessel used for mashing, the process of steeping crushed malt in hot water to convert starches into fermentable sugars. The sweet liquid extracted, called wort, is boiled with hops before fermentation into beer.

Mash tuns are made from stainless steel or copper to resist corrosion. They contain a perforated false bottom to filter the wort while retaining the grain bed. The capacity is sized based on the target batch volume and brew house scale.

Key details:

  • Capacity – 4 BBL or 120 gallons of wort per batch
  • Material – Stainless steel or copper
  • Contains false bottom and sparge arms
  • Sized for mash volumes of 4 barrels or 480 pounds of grain
  • Designed to maintain temperatures for starch conversion
  • Part of the brewhouse system along with the brew kettle

With high quality construction and proper operation, a 4 BBL mash tun provides the foundation for efficiently producing exceptional beer recipes time after time.

4 BBL Mash Tun
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4 BBL Mash Tun Equipment Guide

Commercial mash tuns for 4 BBL breweries are available in different designs and configurations to match brew house requirements and budgets.

Types of 4 BBL Mash Tuns

Single InfusionBasic mash tun with single temperature rest conversion
Multi-RestAdvanced mash program capability with HERMS/RIMS
ElectricIntegrated electric heating elements for mash temperature control
Gas FiredUses gas burner heating system
Steam JacketedSteam coils or jacket for precise mashing temperature

Mash Tun Capacity Specifications

DetailTypical Range
Total Volume150 to 200 gallons
Batch SizeUp to 4 BBL wort
Mash Volume120 to 150 gallons
Grain CapacityUp to 650 pounds

Mash Tun Design and Customization

Mash tun designs can be customized with different options and add-ons:

ShapeSquare or round
Height-to-width RatioFrom short and wide to tall and narrow
Material304 or 316 Stainless Steel, Copper
FinishPolished or brushed interior
InsulationSingle or jacketed insulation
Heating SystemElectric, gas, steam
False BottomPerforated or slotted
Sparge ArmsFixed or rotating
Level IndicatorsSide glass, floating ball, point sensors
ControlsManual, automatic, touchscreen

Mash filters, automated rakes, extended conditioning capability, and custom fabrication can also be incorporated as needed.

Mash Tun Layout and Spaces

A 4 BBL mash tun system requires sufficient space for:

  • Front access for raking and mixing
  • Sparge water lines and heating equipment
  • Wort runoff and transfer lines
  • Control panels and power supply
  • Cleaning and maintenance access

Brewing Process Using a 4 BBL Mash Tun

The typical mashing and lautering process with a 4 BBL system involves:

  1. Heating strike water and transferring to the mash tun
  2. Mixing in crushed grains to reach target mash temperature
  3. Maintaining optimal temperature for starch conversion
  4. Recirculating wort for clarity and efficiency
  5. Raising temperature for mash-out
  6. Sparging to rinse sugars from the grain bed
  7. Runoff of sweet wort to the brew kettle

Efficiency up to 75-80% can be achieved with proper configuration and operation.

Selecting and Buying a 4 Barrel Mash Tun

Choosing an appropriately designed, sized and priced mash tun is critical for 4 BBL breweries.

Key Suppliers and Price Ranges

SupplierPrice Range
JV Northwest$8,000 to $15,000
Premier Stainless$10,000 to $20,000
Rolec Craft Brewing$15,000 to $30,000
Specific Mechanical$8,000 to $25,000
Psycho Brew$10,000 to $35,000
Alternative Beverage Equipment$15,000 to $40,000

Pricing varies based on features, customization, brand and materials. Grain handling equipment and installation will be additional costs. Buyers should get multiple quotes before purchasing.

How to Select the Best 4 BBL Mash Tun

Important criteria for selection include:

Performance Factors:

  • Temperature accuracy and uniformity
  • High lautering efficiency rating
  • Fast heating and response times
  • Fits targeted beer recipes and wort parameters

Quality and Design:

  • Heavy duty stainless steel interior and exterior
  • Integrated stepped mash program controller
  • Advanced rake design for grain bed mixing
  • Fully enclosed steam jacket

Service and Support

  • Responsiveness to quote requests
  • Custom engineering and design services
  • Provides operator training
  • Availability of spare parts and service

Reputation and Experience

  • Specializes in small brewhouse systems
  • Years of experience building mash tuns
  • Positive customer reviews
  • Craft brewery client references

Prioritizing these criteria simplifies the decision process and ensures optimal system performance for years to come. Do not focus purely on price – quality is well worth the investment.

Installation, Operation and Maintenance

Once purchased, proper installation, operation and preventative maintenance ensures maximum efficiency and longevity of a 4 BBL mash tun.

Installation Considerations

  • Floor space and layout
  • Grain handling equipment
  • Electrical and utility requirements
  • Integrations with brew deck and fermentation
  • Local building codes and permits

Standard Operating Procedures

  • Volume calculations for strike and sparge water
  • Detailed mash recipes for each beer type
  • Heating water to temperature setpoints
  • Monitoring and recording all parameters
  • Cleaning cycles and sanitization

Maintenance Best Practices

Inspect steel surfaceMonthly
Replace seals and gasketsAnnually or as needed
Inspect insulationAnnually
Check heating systemQuarterly
Clean sensorsAs needed
Leak checksMonthly
Tune temperature controlAs needed

Avoiding deferred maintenance and following manufacturer guidelines preserves tun integrity.

Comparing 4 BBL Mash Tun Models

When evaluating options from different suppliers, there are several key factors potential buyers must weigh:

Stainless vs CopperResists corrosionBetter sealsExpensiveDifficult fabrication
Electric vs Gas HeatPrecise controlCleanerEfficientHigher energy costsComplex system
Steam vs ElectricVery accurate temperaturesLess power neededSlow heating timesCondensationLicensing
AutomationConsistencyLabor savingData trackingAdditional costComplexity
Square vs RoundBetter drainingMaximizes volumeEasier fabricationLimited customization Can have dead spaces

There are always tradeoffs to consider based on production goals, growth plans, budgets and brewing philosophy. Finding the right balance requires careful introspection of constraints and priorities before committing to a major capital purchase. With good planning and foresight, upgrading in the future as capacity expands can also mitigate compromises today. Do not rush this critical decision without thoroughly researching how each attribute contributes to long term success.

4 BBL Mash Tun


Q: What size mash tun do I need for a 4 BBL brewhouse?

A: A minimum 150 gallon mash tun is recommended, with 180+ gallons preferred to allow adequate room for mash circulation and grain bed expansion during lautering. This safely supports standard 4 BBL batch sizes.

Q: Should I choose stainless steel or copper construction?

A: Stainless steel is more durable, easier to maintain, and provides better temperature stability. Copper offers beautiful aesthetics but requires intensive cleaning and polishing. Stainless is best for production breweries while many small brewpubs still opt for copper’s visual appeal.

Q: What level of automation should I get?

A: Fully automated mash tuns simplify operation and ensure repeatability. However, manual systems with upgraded heating control provide good functionality at a lower price point for budget conscious brewers. Finding the right balance depends on production goals, growth plans and financial constraints. Advanced features can always be added later as capacity expands.

Q: Is a rake system or mash filter recommended?

A: Rakes provide good lautering performance for most breweries. Filters offer faster runoff times and greater efficiency but come at a steep price premium. Assess needs carefully before making this large investment.

Q: Should I fabricate my mash tun in-house to save money?

A: Attempting construction as a DIY project or hiring a non-specialized metal shop both carry substantial risk and is generally not advisable. The engineering expertise and brewing experience of a professional mash tun fabricator is strongly recommended to ensure optimal system functionality and safety.


This guide covers key considerations when researching, selecting and operating a 4 BBL mash tun for professional breweries or ambitious homebrewers. Sufficient capacity, advanced heating control, quality fabrication and precise design is essential to maximizing brewhouse efficiency. While the initial investment is substantial, the right mash tun optimizes wort production for manufacturing exceptional beer styles that delight customers and grow the business for years to come. For further assistance assessing options or developing an RFP for your brewery, please contact an industry expert today.

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