Small batch brewing: 3 to 5 litre batches
Brewing four litres instead of twenty sounds like a toy. It is how a lot of good brewers learn, because you can brew more often, test one change at a time and fit the whole thing in a small kitchen.
Why brew small
A 20 litre batch is about 60 bottles. If it has a fault, you live with it for weeks. A four litre batch is about twelve. Brew, taste, change one thing, brew again.
Small batches also suit Indian homes. A 10 litre pot fits on a domestic hob, the fermenter fits in a kitchen fridge and nobody needs to lift 25 kg of hot wort. If space is the reason you have not started, our guide to brewing in a small apartment covers the rest of the set-up.
The kit you need
- A stock pot of 8 to 10 litres.
- A fine mesh grain bag that fits the pot.
- A 5 litre glass jar or demijohn, with a bung and airlock.
- A thermometer, a hydrometer and a trial jar.
- A digital scale that reads to 0.1 g.
- About a dozen 330 ml bottles and caps.
The scale matters more than it looks. A small batch IPA might need 4 g of bittering hops. On a kitchen scale that reads in whole grams, a 1 g error is 25 per cent of your bitterness. A jewellery scale costs little and solves it.
Scaling a recipe down
Most published recipes are for 19 to 23 litres. Grain, hops and salts scale in a straight line with volume. A recipe for 20 litres becomes a fifth of every quantity for 4 litres. Our guide to scaling a beer recipe walks through the arithmetic.
Two things do not scale neatly. Boil-off depends on the surface area of your pot and the strength of your burner, not the batch size, so a small batch loses a bigger share of its volume. Measure it once and plan for it. Efficiency also changes, usually upwards on a small stove top mash because it is easy to stir and hold temperature.
As a starting point, about 1 kg of pale malt gives roughly 4 litres of wort around 1.050 using brew in a bag.
Brew day on the hob
Heat about 6 litres of water to about 70 °C, stir in the grain in its bag and hold 65 to 67 °C for an hour. A small pot loses heat fast, so put it in a warm oven that has been switched off, or wrap it well. Lift the bag, let it drain, boil for an hour with your scaled hops, then chill.
Chilling is the easy part. Four litres in a pot drops quickly in a sink of ice water, often in 15 to 20 minutes, far faster than a 20 litre kettle.
Fermenting a small batch
Leave headspace. Fill a 5 litre jar to about 4 litres, because a vigorous ale fermentation throws a lot of foam. For the first two days, a blow-off tube into a glass of sanitiser is safer than an airlock.
A full 11 g sachet of dry yeast is meant for about 20 litres. For 4 litres, two or three grams is enough. Fold the rest of the sachet closed, tape it and store it in the fridge for a brew in the next few weeks.
Temperature control is the real gift of small batches. A 5 litre jar fits on a fridge shelf. Set to the low end of the fridge's range with a controller, or used with a water bath and ice packs, it gives you control over fermentation that most 20 litre homebrewers in India do not have.
Priming and bottling twelve bottles
For a typical ale at about 2.4 volumes of CO2, you need roughly 6 g of table sugar per litre. For 4 litres that is about 24 g. Dissolve it in a little boiled water, cool it, then gently stir it into the beer before bottling. Our guide to bottle conditioning and priming sugar explains how to adjust for different styles.
You can also dose each bottle, about 2 g in a 330 ml bottle, but with sugar this small a few crystals either way makes a noticeable difference. Batch priming is more even.
What small batches teach you
The point of brewing small is to learn faster. Brew the same pale ale three times, changing only the mash temperature. Then the hop. Then the yeast. In a couple of months you will know what each lever does, which most brewers take years to work out by accident.
Keep a log of every batch. Twelve bottles disappear quickly. The notes are what you keep.
Common questions
How much grain do I need for a 4 litre batch?
About 1 kg of pale malt gives roughly 4 litres at around 1.050 using brew in a bag. Your own efficiency will shift that a little.
How much yeast for a 5 litre batch?
Two to three grams of dry yeast is enough for about 4 litres of normal strength wort. Store the rest of the sachet sealed in the fridge.
Is small batch beer worse than a full batch?
No. The process is the same. Small batches are often easier to control. The main trick is weighing small hop and sugar additions accurately.
