What is the step-by-step brewing process for non-alcoholic beer?
NA beer can be produced by two primary processes: arrested fermentation (brewing stops before significant alcohol is produced) and dealcoholisation (beer is fully fermented then alcohol is removed). Dealcoholised NA beer typically achieves better flavour complexity than arrested fermentation because the full fermentation process develops ester and hop compound profiles. Vacuum distillation for dealcoholisation operates at 20 to 35 degrees Celsius to preserve hop aromatics.
Step 1, Mashing: Crushed malted grain is mixed with hot water at 62–75°C for 60–90 minutes. Mash temperature is the first critical NA decision: 62–65°C favours beta-amylase, producing fermentable maltose. 72–75°C favours alpha-amylase, producing more unfermentable dextrins and less alcohol potential. Most NA brewers mash at 72–75°C to reduce potential alcohol before fermentation even begins.
Step 2, Lautering: The liquid wort is separated from the spent grain via filtration through the grain bed (vorlauf) and sparge (rinsing). Standard process, no modification needed for NA production.
Step 3, Boiling: Wort is boiled for 60–90 minutes. Hops are added for bittering (early addition) and aroma (late addition/flameout). Proteins are coagulated. No NA-specific modifications at this stage, though some producers reduce hop bitterness levels (lower IBU) to avoid harshness without alcohol's mouthfeel buffer.
Step 4, Fermentation (critical NA modification): Wort is chilled and pitched with yeast. For NA production: either (a) controlled fermentation at very low temperature (0–2°C) with arrest by filtration at target ABV; (b) short-duration standard fermentation arrested by rapid chilling at 0.3–0.8% ABV; (c) standard fermentation to 2.5–5% ABV followed by dealcoholization. Each option has dramatically different flavour impacts.
Step 5, Conditioning and packaging: The beer is conditioned cold (1–4°C) for 1–4 weeks. Carbonation is adjusted (forced CO2 or natural priming). Packaging in can or bottle with appropriate oxygen management, oxygen is the primary enemy of NA beer shelf life, producing cardboard/papery off-notes within days at room temperature.
The mashing programme for NA beer differs fundamentally from conventional beer because it must create a wort whose fermentable-to-non-fermentable sugar ratio is shifted towards non-fermentable dextrins to provide body without requiring full fermentation to generate mouthfeel. The primary technique is conducting the mash at elevated saccharification temperatures of 72 to 76°C rather than the conventional 65 to 68°C. At elevated temperatures, beta-amylase activity is reduced relative to alpha-amylase, producing a wort richer in limit dextrins (DP3 to DP7) that cannot be fermented by yeast but contribute to viscosity and body in the finished beer. A mash at 74°C for 60 minutes followed by mash-off at 78°C typically produces a wort with an apparent degree of fermentation (ADF) limit of 45 to 55%, versus 75 to 82% for a conventional 65°C mash. This physiological limitation on fermentable sugar ensures that even if fermentation runs longer than intended, the ethanol ceiling is naturally constrained by the non-fermentable dextrin content.
The kettle boil stage for NA beer must balance colour development and hop isomerisation against minimising Maillard reaction products that create "cooked wort" flavour notes. At standard 100°C boil, Maillard reactions produce melanoidins and furfurals that contribute to a recognisable "cooked", "wort-like" or "cereal" flavour note in the finished NA beer, which is one of the most common consumer complaints. Reduced-pressure boiling at 88 to 92°C (using a vacuum kettle) suppresses these reactions, particularly the formation of furfural (aldehyde of pentose sugars) by up to 60%, while still achieving adequate hop alpha-acid isomerisation, according to VLB Berlin's hop isomerisation study at varying boil temperatures from 2022. Several European NA beer breweries have retrofitted vacuum kettles specifically to address the "wort flavour" complaint.
Dry hopping protocols for NA beers require adaptation from conventional craft brewing practice because the absence of ethanol changes the extraction behaviour of hop oil compounds into the liquid. In ethanol-containing beers, lipophilic hop compounds such as beta-myrcene and linalool are readily extracted from hop pellets because ethanol acts as a co-solvent. In near-water NA beers (below 0.5% ABV), extraction of these compounds is less efficient, requiring either longer dry-hop contact times (72 to 96 hours versus 48 hours for full-strength beer) or increased dry-hop rates (15 to 25 g/hL higher than an equivalent ABV beer) to achieve the same perceived hop intensity. Research from the Research and Teaching Institute for Brewing in Bavaria (VLB, 2022) quantifies this effect as approximately a 30% reduction in linalool extraction efficiency at 0% ABV versus 5% ABV, providing brewers with a quantitative basis for hop rate adjustments in NA recipes.
The carbonation strategy for NA beer requires different technical targets than for standard lager. Because NA beer lacks the flavour complexity of ethanol, excessive CO2 can make the carbonation sensation dominate the drinking experience, masking malt and hop flavours. The recommended CO2 target for most NA lager styles is 2.5 to 3.5 g/L, slightly below the typical 4.5 to 5.0 g/L for continental lager. Counter-pressure filling to plus or minus 0.1 g/L precision is essential to ensure consistent sensory experience across packages, and dissolved oxygen at packaging must be below 50 ppb to maintain carbonation freshness character throughout shelf life.
| Step | Standard beer | NA beer modification |
|---|---|---|
| Mashing temperature | 65–68°C (fermentable) | 72–75°C (dextrin-rich, less fermentable) |
| Fermentation | Full attenuation (5–7% ABV) | Arrested/controlled (0.3–0.8%) OR dealcoholized |
| Hop rate | Standard IBU target | Often reduced (no alcohol buffer for bitterness) |
| Packaging | Standard oxygen management | Critical, oxygen extremely damaging to NA |
The zeroproof.one guide to non-alcoholic beer explains how the world's best NA breweries execute each step — and what to look for when evaluating quality on the shelf.