DrainPro Mash Tun – 20G

Dedicated Mash Tun with True Bottom Drain

A purpose-built 20-gallon mash tun designed for efficient lautering, minimal dead space, and repeatable electric brewing workflows.

The DrainPro Mash Tun – 20G is Bräu Supply’s dedicated mash vessel for electric brewing systems. Designed specifically for mashing and lautering at moderate to larger batch volumes, it features a true bottom drain paired with a precision-fit stainless steel false bottom (included) to promote even wort collection, efficient runoff, and minimal liquid retention.

Built from mirror-polished 304 stainless steel with laser-etched internal volume markings, silicone-coated handles, and welded stainless steel legs, the DrainPro 20G Mash Tun integrates cleanly into modern tri-clamp–based brewing systems and is optimized for consistent mash performance across a wide range of grain bills.

Overview

The DrainPro 20G Mash Tun is engineered for controlled mash hydration, stable recirculation, and clean lautering. The dished bottom geometry directs wort toward the center drain while supporting a low-profile false bottom, reducing liquid retention beneath the grain bed and improving extraction efficiency.

A welded tri-clamp port layout supports continuous recirculation, temperature monitoring, and controlled runoff. When paired with a pump-driven vorlauf, the DrainPro Mash Tun delivers clear wort to the boil kettle without channeling or grain bed compaction.

Key Features

• Mirror-polished 304 stainless steel interior and exterior
• True bottom drain for complete wort collection
• Dished bottom geometry to minimize liquid retention under the false bottom
• Stainless steel false bottom included, precision-fit to the vessel
• Optimized for continuous vorlauf and pump-driven recirculation
• Welded 1.5" tri-clamp ports for modular plumbing
• Temperature probe port for mash monitoring
• Laser-etched internal volume markings (gallons and liters)
• Silicone-coated handles and welded stainless steel legs

Dead Space & Lautering Efficiency

Mash tun “dead space” is not a fixed value—it varies based on mash thickness, grain crush, false bottom fit, recirculation rate, and runoff method. Rather than publishing a single number that can be misleading, the DrainPro Mash Tun is engineered to minimize residual wort through vessel geometry and component design.

The dished bottom directs wort toward the center drain, allowing the false bottom to sit low in the vessel while maintaining even flow beneath the grain bed. Combined with continuous vorlauf, this promotes efficient wort collection and reduces liquid retention under normal operating conditions.

In practice, brewers achieve high lauter efficiency and clean runoff without needing to compensate for excessive dead space.

What’s Included — DrainPro Mash Tun 20G

• DrainPro 20G mash tun body with welded 1.5" tri-clamp ferrules
• Stainless steel false bottom (included)
• Dip tube / wort pickup
• Lid
• Welded stainless steel legs
• Silicone-coated handles on vessel and lid

Compatible Accessories

• Vorlauf arms and recirculation fittings
• Tri-clamp valves, elbows, and tees
• Brewing pumps and quick-disconnect kits
• SV1 and SV2 electric brewing controllers
• HERMS coil systems (when configured as part of a HERMS setup)

Technical Specifications — DrainPro Mash Tun 20G

Capacity

• Maximum capacity (spillover): 22.75 US gal (86.1 L)

Dimensions

• Body internal diameter: 450 mm (17.7")
• Vessel body internal height: 500 mm (19.7")
• Bottom dish depth (internal): 78 mm (3.06")
• Leg height: 200 mm (7.9")
• Overall height including legs (approx.): 700 mm (27.6")

Ports & Configuration

• Bottom drain: 1.5" tri-clamp (true bottom drain)
• Recirculation / runoff port: 1.5" tri-clamp
• Temperature probe port: 1.5" tri-clamp

System Integration

The DrainPro 20G Mash Tun is designed to integrate seamlessly into electric three-vessel brewing systems and modular tri-clamp–based setups. It pairs directly with DrainPro Hot Liquor Tanks, DrainPro Boil Kettles, pumps, and electric brewery controllers to form a clean, efficient mash and lauter workflow.