A hem brew system improves brewing results by giving brewers tighter control over mash temperature, wort transfer, lautering, boiling, cooling, and fermentation preparation. The manufacturer lists systems from 100 L to 200 T, with PID or PLC controls and stated heat-transfer efficiency of at least 90% on selected brewhouses. Those specifications matter because brewhouse efficiency measures how much available malt extract reaches the wort. In 2026, the Brewers Association noted that a 10% increase in extract efficiency can equal roughly one less bag of malt per batch in an example brewery. Better process control also reduces batch-to-batch differences in gravity, volume, temperature, and processing time.
Brewing performance starts before wort reaches the kettle. During mashing, crushed malt, water, temperature, pH, mixing, and residence time determine how effectively starch is converted and recovered. A commercial system that maintains programmed temperatures with PID or PLC control reduces dependence on manual valve adjustment and repeated thermometer checks. The manufacturer offers PID, semi-automatic PLC, and fully automatic PLC configurations, allowing a brewery to choose the amount of process control appropriate for its production volume.
Temperature consistency matters because enzyme activity changes across the mash range. A brewer may work around 63–65°C when seeking greater fermentability or around 67–69°C when retaining more dextrin, although malt specification and recipe design still determine the appropriate rest. A control system cannot improve unsuitable malt or an incorrect recipe, but it can hold a chosen setpoint more consistently across a 300 L batch, a 1,000 L batch, or a larger commercial run.
That consistency becomes easier to evaluate when efficiency is measured rather than judged from finished beer alone. The Brewers Association defines brewhouse efficiency as the percentage of extract recovered into wort compared with the extract available from the malt. Its 2026 guidance recommends establishing a baseline using accurate gravity and volume measurements instead of assuming that a higher original gravity automatically indicates better performance.
A brewery producing 1,000 L of wort does not gain much from reaching the target gravity once if later batches miss it. The useful measure is how closely the same recipe reproduces gravity, volume, temperature, and timing across repeated brews.
Lautering is the next place where equipment design can change the result. Wort needs to separate from spent grain without excessive bed compaction, poor runoff, or unnecessary extract remaining in the grain. Pump control, vessel geometry, false-bottom design, raking configuration, and sparging practice all affect runoff. When flow is too aggressive, the grain bed may compact; when it is too slow, cycle time increases and the brewhouse produces fewer batches during a working day.
The relationship between extract recovery and raw-material use is measurable. A 2026 Brewers Association example states that improving extract efficiency by 10% could reduce malt use by about one bag per batch under the conditions used in its calculation. The exact saving varies with malt potential, recipe weight, brewhouse size, and grain cost, so operators should calculate efficiency from their own production records rather than apply a fixed percentage to every recipe.
| Process point | Measurement worth recording | What a stable system helps control |
|---|---|---|
| Mash | Temperature, pH, time | Enzyme working conditions |
| Lauter | Runoff time, gravity, collected volume | Extract recovery and flow |
| Kettle | Pre/post-boil gravity, evaporation | Wort concentration |
| Whirlpool | Transfer volume, trub loss | Clear wort recovery |
| Cooling | Outlet temperature, cooling time | Yeast-pitch preparation |
| Batch record | Final volume and gravity | Repeatability between brews |
After lautering, kettle performance determines how consistently wort reaches its target concentration. Boiling evaporates water, sterilizes wort, changes hop compounds, coagulates proteins, and removes volatile material. A brewery therefore needs repeatable heat input and a known evaporation rate. If one 60-minute boil loses 8% of wort volume and the next loses 13%, identical recipes can finish at different gravities even when mash extraction was nearly the same.
Stable heating also helps a brewer separate recipe problems from equipment problems. If pre-boil gravity is correct but post-boil gravity repeatedly runs high, evaporation can be checked before changing malt quantity. If both readings are low, mash conversion, milling, sparging, or wort collection deserves attention first. A controlled brewhouse turns gravity readings into useful process information because fewer operating conditions change at the same time.
Hem Brewing lists electric, steam, and direct-fire heating options across its equipment range. Heating choice affects installation, response time, utility demand, cleaning, and scale. On selected craft systems, the company states heat-transfer efficiency of at least 90% and lists power requirements from roughly 48 kW for a 10 bbl configuration to about 60 kW for a listed 20 bbl system. Those figures are manufacturer specifications and should be checked against the final vessel layout, local electrical supply, and production schedule before purchase.
Heat management continues after boiling. Wort usually needs to reach yeast-pitching temperature quickly enough for the brewery’s process, and a plate heat exchanger allows heat to move from hot wort to cooling water in a compact area. Hem Brewing lists heat-exchange areas ranging from about 0.45 m² on a 300 L system to 2 m² on a 1,000 L unit, with larger configurations available. Actual cooling time still depends on inlet-water temperature, flow, wort temperature, exchanger cleanliness, and the selected outlet target.
A heat exchanger rated for a larger surface area does not guarantee a colder outlet. A brewery entering with 24°C cooling water faces a different cooling limit from one using 10°C water, even if both systems move the same wort volume per hour.
Faster, repeatable cooling also affects scheduling. When one batch takes 25 minutes to cool and another takes 50 minutes, the delay can move yeast-pitch timing, tank occupancy, labor, and the next brew start. Recording wort inlet temperature, coolant inlet temperature, outlet temperature, and transfer time gives the brewer a better comparison than recording only “cooling completed.”
The same principle applies to pumps and wort transfers. Hem Brewing specifies dedicated wort and hot-water pumps on multiple configurations and offers two-, three-, four-, and larger vessel layouts. More vessels can let operations overlap, but throughput does not rise simply because another tank is added. A brewery producing 2–3 brews per day needs enough heating, hot-water storage, pumping capacity, cooling capacity, cellar space, and staff coverage for the whole process to keep pace.
Automation helps when it repeats known operating conditions rather than replacing measurement. A PLC can control valves, pumps, temperature steps, and timed operations, while an operator still verifies malt condition, gravity, volume, pH, sensory condition, and sanitation. A recipe that calls for a 66°C mash rest gains consistency when the controller holds that temperature, but the control screen cannot tell whether a worn mill has changed the crush distribution unless the brewery also monitors milling and extraction.
That distinction matters for quality records. The Brewers Association’s technical materials treat milling, mashing, lautering, boiling, sanitation, and other production stages as connected parts of yield and beer quality. Its technical team reports more than 50 years of combined craft brewing experience, and its brewhouse guidance recommends comparing measurements across batches instead of evaluating each stage in isolation.
Cleaning design also affects brewing results because deposits left in pipework, valves, exchangers, or tanks can alter heat transfer and provide places for unwanted microorganisms or soil to remain. Clean-in-place systems circulate cleaning liquid through internal surfaces instead of requiring workers to reach every area manually. Brewers Association training published in 2025 describes CIP as a way to reduce human error, improve coverage of inaccessible surfaces, limit cross-contamination between cleaning stages, and reduce employee exposure to chemicals.
Chemical concentration still has to be verified rather than guessed. Brewers Association guidance for draught systems, for example, specifies at least 2% caustic for routine line cleaning, 3% for heavily soiled systems, water around 80–110°F, and at least 15 minutes of recirculated contact time. Tank and brewhouse CIP procedures use equipment-specific chemistry and temperatures, so chemical supplier instructions, gasket compatibility, soil type, and brewery sanitation procedures remain the appropriate reference for each installation.
Water use deserves the same level of measurement. Brewing does not consume water only in the recipe; rinsing, vessel cleaning, floor cleaning, cooling, packaging, and utilities can use more water than the beer itself. Brewers Association wastewater guidance reports that many breweries discharge more than 70% of incoming water as effluent, showing why valve control, rinse scheduling, CIP recovery, and leak management affect operating performance as well as sanitation.
Equipment sizing therefore needs to match the production plan rather than the largest vessel a site can physically hold. Hem Brewing lists small systems from roughly 1–10 hL and craft configurations from about 10–30 hL, while its broader range extends from 100 L to industrial-scale equipment. A listed 300 L system calls for about 35 m² of space, while one listed 1,000 L configuration uses about 90 m²; actual installations also need safe access, drainage, utilities, grain handling, cellar space, and cleaning clearance.
Production frequency matters as much as nominal vessel volume. A 1,000 L brewhouse completing one batch per day produces a different weekly output from the same nominal size running two batches per day, and fermenter availability may become the limiting point before the brewhouse does. The manufacturer lists 1–2 brews per day for several small systems and 2–3 brews per day for some larger configurations, but achievable throughput depends on recipe duration and the rest of the facility.
For day-to-day brewing, the most useful performance record combines planned settings with measured results: malt weight, liquor volume, mash temperature, pH, first-wort gravity, pre-boil volume, pre-boil gravity, post-boil volume, original gravity, cooling time, and packaged yield. If a brewery records 20 consecutive batches, it can compare spread rather than relying on one successful brew. A gravity target of 1.052 is more informative when most batches remain within a narrow range than when readings move from 1.047 to 1.057.
The same records show whether automation is producing a measurable improvement. Compare 20 batches before a control change with 20 after it, using the same recipe where practical. Look at gravity variation, final wort volume, cycle time, extract efficiency, energy use, water use, and losses. A smaller batch-to-batch spread is more useful than a higher single-batch number, because commercial brewing depends on reproducing the intended beer across weeks of production rather than achieving one unusually efficient brew.