You’re standing in front of the yeast shelf at your local homebrew supplier staring at three packets that all promise “clean ale fermentation.” Safale US-05, Safale S-04, Lallemand Nottingham — they look similar, cost similar, and the descriptions on the back read like they were written by the same person. But pitch any of these into the same wort and you’ll get a noticeably different beer.
After brewing the same American pale ale recipe with all three yeasts in consecutive batches, the differences were striking. US-05 gave the cleanest, most neutral result. S-04 added a subtle fruity ester. Nottingham was bone-dry and dropped crystal clear in three days. Same recipe, same process, three distinct beers. That’s the power of yeast choice.
In This Article
- Why These Three Yeasts?
- Safale US-05: The Clean All-Rounder
- Safale S-04: The English Character
- Lallemand Nottingham: The Fast Finisher
- Head-to-Head Comparison
- Which Yeast for Which Beer Style
- Fermentation Temperature and Flavour
- Pitching and Rehydration
- Attenuation and Flocculation Explained
- Cost and Availability in the UK
- When to Look Beyond These Three
- Frequently Asked Questions
Why These Three Yeasts?
US-05, S-04, and Nottingham are the three most popular dry ale yeasts in UK homebrewing. They’re stocked everywhere, they’re affordable, they’re reliable, and between them they cover the vast majority of ale styles. If you’re brewing your first few batches, one of these three is what you should be using.
Dry Yeast vs Liquid Yeast
Dry yeasts like these three are freeze-dried and shelf-stable for months. They don’t need a starter, they’re cheap (about £3-5 per packet), and they tolerate higher temperatures during shipping than liquid yeasts. Liquid yeasts (from brands like Wyeast and White Labs) offer more strain variety and some unique flavours, but they cost £7-10, have shorter shelf lives, and often benefit from a yeast starter.
For beginners and for most standard ales, dry yeast is the smarter choice. Save liquid yeasts for Belgian styles, specific lagers, or when you want a very particular flavour profile that dry yeast can’t replicate.
For a broader overview of yeast types including lager strains and wild yeasts, our brewing yeast guide covers the full range.
Safale US-05: The Clean All-Rounder
The Profile
US-05 is Fermentis’s dried version of the legendary American ale strain — widely believed to be the same strain as Wyeast 1056 and White Labs WLP001. It produces clean, neutral fermentation with minimal esters or phenols. What you taste is the malt and hops, not the yeast.
Key Specs
- Temperature range: 15-24°C (ideal 18-20°C)
- Attenuation: 78-82% (tends toward dry)
- Flocculation: Medium — drops reasonably clear but may need cold crashing for bright beer
- Alcohol tolerance: Up to 11% ABV
Best Styles
- American Pale Ale and IPA — lets the hops shine without yeast character interfering
- Blonde ales and golden ales — clean and refreshing
- American wheat beer — neutral without the banana and clove of German wheat yeast
- Stouts and porters — clean fermentation lets roasted malt flavours dominate
What We Found
US-05 is the workhorse. Over roughly twenty batches using this yeast, it has never failed to ferment cleanly, finish dry, and produce a predictable result. It’s forgiving of temperature swings (it handles 16-22°C without producing noticeable off-flavours) and attenuates well even without precise mash control.
The one downside is its medium flocculation — it takes 7-10 days to clear at room temperature and benefits from 2-3 days of cold crashing at 2-4°C for a bright final product.
Safale S-04: The English Character
The Profile
S-04 is an English ale yeast that adds subtle fruity esters to your beer. It’s the character yeast — the one that gives a bitter or best bitter that classic “English pub” quality. Where US-05 gets out of the way, S-04 makes its presence known.
Key Specs
- Temperature range: 15-24°C (ideal 18-20°C)
- Attenuation: 72-78% (moderate — leaves more residual sweetness than US-05)
- Flocculation: High — drops bright quickly, often within 3-4 days
- Alcohol tolerance: Up to 9% ABV
Best Styles
- English bitter, best bitter, ESB — the definitive yeast for these styles
- English IPA — more malt-forward and fruity than an American IPA
- Brown ales — the fruity esters complement nutty malt character
- Mild ales — low attenuation keeps some sweetness, which suits session milds
- Stouts with body — the lower attenuation leaves a fuller mouthfeel than US-05
What We Found
S-04 is the quickest to clear. It floccs hard and fast — you’ll have visibly clear beer in the fermenter within a week. The trade-off is that it can drop out too early, leaving the beer slightly under-attenuated. We found that rousing the fermenter gently (a swirl of the bucket) around day 3-4 ensures it finishes properly.
The ester profile is pleasant — apple, pear, and a touch of dried fruit at lower temperatures. Push it above 22°C and the esters become more pronounced, which can be too much for lighter beers but works well in stronger bitters and old ales.
Lallemand Nottingham: The Fast Finisher
The Profile
Nottingham is a high-performance ale yeast known for speed, clean fermentation, and exceptional clarity. It’s the Formula One of dry ale yeasts — it gets the job done fast, cleanly, and predictably.
Key Specs
- Temperature range: 10-25°C (broadest range of the three)
- Attenuation: 80-86% (very high — produces dry beers)
- Flocculation: Very high — drops crystal clear, often within 3 days
- Alcohol tolerance: Up to 14% ABV
Best Styles
- Pale ales — clean and dry with crisp hop character
- Lager-like ales — fermented at 12-15°C, Nottingham produces remarkably clean, lager-like beer
- High-gravity ales — 14% tolerance handles big beers well
- Session bitters — the high attenuation makes dry, drinkable session ales
- Ciders — many homebrewers use Nottingham for cider because it ferments clean and dry
What We Found
Nottingham is absurdly fast. We’ve seen it finish primary fermentation in 3 days at 18°C — which is half the time US-05 and S-04 typically take. It also ferments clean across a wider temperature range than either competitor. At 12°C it produces a near-lager character. At 20°C it’s a clean ale. Push it to 24°C and it still behaves.
The downside is the high attenuation. If you want body and residual sweetness in your beer, Nottingham will eat every fermentable sugar in sight. Mash at 67-68°C to create more unfermentable dextrins if you want any sweetness to survive.
Head-to-Head Comparison
Flavour
- Most neutral: US-05 — lets ingredients speak for themselves
- Most characterful: S-04 — adds fruity English ale esters
- In between: Nottingham — clean but bone-dry, which itself becomes a character
Speed
- Fastest: Nottingham — often done in 3-5 days
- Middle: S-04 — typically 5-7 days
- Slowest: US-05 — typically 7-10 days (still perfectly normal)
Clarity
- Clearest: Nottingham — drops bright almost immediately
- Second: S-04 — high flocculation, clear within a week
- Third: US-05 — medium flocculation, benefits from cold crashing
Attenuation
- Driest: Nottingham (80-86%) — bone-dry results
- Medium: US-05 (78-82%) — crisp but not aggressive
- Fullest body: S-04 (72-78%) — most residual sweetness
Temperature Tolerance
- Widest range: Nottingham (10-25°C) — can mimic lager at low temps
- Middle: US-05 and S-04 (both 15-24°C) — similar ranges but US-05 is more forgiving of temperature swings
Which Yeast for Which Beer Style
American Styles → US-05
Any recipe where hops are the star — APAs, IPAs, hop-forward ambers. The neutral profile lets Citra, Mosaic, and Simcoe do their thing without yeast interference. Also the best choice for American-style wheat beers and cream ales.
English Styles → S-04
Bitters, milds, ESBs, English IPAs, brown ales, porters with character. If the recipe would traditionally be served on cask in an English pub, S-04 is your yeast. The esters and moderate attenuation create that unmistakable pub feel.
Lager-like Ales → Nottingham at 12-15°C
If you want a clean, crisp beer without the 6-week lagering process, Nottingham fermented cool is the shortcut. It won’t fool a lager purist, but for a session-friendly, easy-drinking pale ale, it comes remarkably close.
High-Gravity Brewing → Nottingham
Big IPAs, imperial stouts, barley wines, Belgian-strength ales (though Belgian yeasts add more character). Nottingham’s 14% tolerance handles high-gravity worts that would stall US-05 or S-04.
Cider → Nottingham
Clean, dry, and fast. Nottingham ferments apple juice into cider with minimal off-flavours, and the high attenuation suits the bone-dry profile most cider makers want.
Fermentation Temperature and Flavour
The Simple Rule
Lower temperatures produce cleaner fermentation. Higher temperatures produce more esters and fusel alcohols. The sweet spot for all three yeasts is 18-20°C.
Temperature Effects by Yeast
- US-05 at 16°C: Very clean, slow fermentation (10-14 days). Minimal esters
- US-05 at 22°C: Still clean but slightly fruitier. Ferments in 7-8 days
- S-04 at 16°C: Subtle esters — apple and pear. Clean overall
- S-04 at 22°C: More pronounced esters. Good for ESBs and strong bitters
- Nottingham at 12°C: Lager-like. Very clean, very slow (10-14 days)
- Nottingham at 20°C: Clean ale. Fast fermentation (3-5 days)
- Nottingham at 24°C: Still acceptable but some fusel notes may develop
Temperature Control on a Budget
You don’t need a fermentation fridge. A water bath (fermenter in a large tub of water) stabilises temperature and provides 2-3°C of cooling through evaporation. In UK homes, a cool cupboard or spare room away from radiators typically sits around 18-20°C — perfect for all three yeasts.
Pitching and Rehydration
Direct Pitching
All three yeasts can be sprinkled directly onto wort at the correct temperature. This is what most homebrewers do, and it works fine for standard-gravity beers (OG under 1.060). Just open the packet, sprinkle evenly over the wort surface, and seal the fermenter.
Rehydration (Optional)
Rehydrating in warm water (25-30°C) for 15-20 minutes before pitching reportedly improves cell viability by 10-20%. In practice, with fresh packets and standard-gravity worts, the difference is hard to detect. For high-gravity brews (OG over 1.070) or older packets, rehydration is worth doing.
Pitch Rate
One 11.5g packet of any of these yeasts is sufficient for a standard 23-litre batch at normal gravity (OG 1.040-1.060). For higher gravities, use two packets or make a starter. Under-pitching results in stressed yeast, off-flavours, and stalled fermentation.
If you’re just starting your brewing journey, our beginner’s guide covers the full process from grain to glass.
Attenuation and Flocculation Explained
Attenuation
Attenuation is the percentage of sugar consumed during fermentation. Higher attenuation means a drier beer.
- 72% attenuation (typical S-04): OG 1.050 → FG ~1.014. Medium body, some sweetness
- 80% attenuation (typical US-05): OG 1.050 → FG ~1.010. Crisp, balanced
- 84% attenuation (typical Nottingham): OG 1.050 → FG ~1.008. Dry, thin body
Your mash temperature affects attenuation regardless of yeast. Mashing at 64-66°C creates more fermentable sugars (higher attenuation). Mashing at 68-70°C creates more unfermentable dextrins (lower attenuation, more body).
Flocculation
Flocculation is how quickly yeast clumps together and drops to the bottom of the fermenter after fermentation.
- High flocculation (S-04, Nottingham): Yeast drops out fast, beer clears quickly. Risk of under-attenuation if it drops too early
- Medium flocculation (US-05): Yeast stays in suspension longer, chewing through more sugar. Needs cold crashing for bright beer
In the UK, beer duty is calculated on ABV, so understanding attenuation helps you predict your final alcohol content — and your duty liability if you ever brew commercially.
Cost and Availability in the UK
Pricing (2026)
- Safale US-05 (11.5g): About £3.50-4.50 per packet
- Safale S-04 (11.5g): About £3.50-4.50 per packet
- Lallemand Nottingham (11g): About £3.00-4.00 per packet
All three are available from every UK homebrew retailer — The Malt Miller, BrewUK, The Home Brew Shop, Geterbrewed, and Amazon UK.
Shelf Life
Dry yeast packets last 2+ years stored cool and dry. Check the best-before date and buy from retailers with high turnover. Old yeast with low viability causes slow starts and off-flavours.
Bulk Buying
All three are available in 500g bricks (about £15-20) — enough for roughly 40 batches. If you brew regularly with one yeast, bulk buying saves over 50% per batch.
When to Look Beyond These Three
Belgian Styles
None of these three produce the phenols (clove, pepper) and esters (banana, bubblegum) that define Belgian ales. For witbiers, saisons, tripels, and dubbels, you need specific Belgian yeast strains — either Lallemand Belle Saison (dry) or liquid strains from Wyeast and White Labs.
Lagers
While Nottingham can approximate lager at cool temperatures, true lagers need bottom-fermenting Saccharomyces pastorianus strains. Fermentis W-34/70 is the go-to dry lager yeast.
Sour and Wild Ales
For sour beers, you need Lactobacillus, Pediococcus, or Brettanomyces — entirely different organisms. None of these three ale yeasts will produce sour beer.
When You’ve Outgrown Dry Yeast
Once you’re confident with the brewing process and want to experiment with flavour, liquid yeasts open up hundreds of strains with unique profiles. Start with Wyeast or White Labs and explore from there.
Frequently Asked Questions
Can I use US-05 for an English bitter? You can, but it won’t taste like a traditional bitter. US-05 ferments too cleanly — you’ll miss the fruity esters that define the style. S-04 is the right choice for English bitters. US-05 would make it taste more like an American amber ale.
Which yeast is best for beginners? US-05. It’s the most forgiving of temperature fluctuations, produces reliably clean results, and works across the widest range of styles. You can brew everything from pale ales to stouts with US-05 and get good results every time.
Do I need to make a yeast starter with dry yeast? For standard-gravity beers (OG under 1.060), no. One packet is sufficient for a 23-litre batch. For high-gravity brews (OG over 1.070), either use two packets or rehydrate carefully. Yeast starters are more commonly used with liquid yeast.
Can Nottingham really make lager-like beer? At 12-15°C fermentation temperature, Nottingham produces remarkably clean beer with minimal ale character. It won’t fool a BJCP judge in a lager competition, but for everyday drinking it’s a convincing shortcut that avoids the 6-week cold conditioning period real lagers require.
How do I store unused dry yeast? Keep unopened packets in the fridge (not freezer). They’ll last past the best-before date by months. Once opened, fold the packet tightly, clip it shut, and store in the fridge — use within a week for best results. Don’t leave open packets at room temperature.