How to Steam Milk and Pour Microfoam: A Coffee Shop Guide
Last updated: September 2026
Pour a flat white with thin, splashy milk and it looks unfinished, even when the espresso underneath is perfect. The fix isn’t a pricier machine — it’s technique.
Microfoam — the smooth, glossy foam used for flat whites, lattes and latte art — is widely regarded as the single skill that separates a professional coffee shop’s drinks from a home setup. Any machine with a working steam wand, from an entry-level single-group machine around £1,240 upwards, can produce it once you steam in two stages: stretch with air, then texture to roughly 55-65°C.
In 30 seconds:
- Microfoam is fine, glossy, paint-like milk. Not big bubbles, and not flat, thin milk.
- Aim for roughly 55-65°C for most drinks. Stop once the jug is too hot to hold.
- Air goes in first (stretching). Then the milk gets folded and heated (texturing).
- Whole dairy milk is the most forgiving. Oat and skimmed need less air and more care.
- The single biggest mistake is walking away from the jug while it steams.
This guide assumes you already have a machine with a working steam wand. If you’re still choosing a machine, see our semi-automatic vs automatic vs bean-to-cup coffee machine guide first.
Why microfoam matters more than the shot. Customers taste the espresso, but they see and feel the milk. Flat, splashy milk reads as amateur even when the coffee is good. Microfoam is what lets a barista pour a clean, glossy flat white — or latte art — every single time.
What actually happens inside the jug. Steaming milk is two jobs, done in order, not one. First you inject air near the surface — that’s stretching, and it creates the foam. Then you submerge the tip and use the steam to heat and fold that foam into the milk until it’s silky — that’s texturing. Most bad pours come from doing both at once, or in the wrong order.
The honest summary — the biggest mistake is walking away. Milk temperature moves fast in the final seconds. A barista who checks their phone mid-steam comes back to milk that’s already scalded or split. Keep a hand on the jug the whole time. That’s the entire trick.
What You’ll Need
- A coffee machine with a working steam wand, warmed up for at least 15 minutes from cold
- A stainless steel milk jug — 12oz (350ml) for one or two drinks, 20oz (600ml) for a busy run
- Cold, fresh milk straight from the fridge — warm milk steams unevenly and overheats too fast
- A thermometer clipped to the jug, or enough practice to judge temperature by touch
- A clean, damp cloth to purge and wipe the wand after every single use
Step 1: Purge the Wand and Position the Jug
Open the steam valve for one second to clear condensed water from the tip. Wipe it. Fill the jug to just below where the spout curves — no further.
Why: a wet wand spits and thins your foam with extra water. An overfilled jug forces you to stop before the milk has textured.
Step 2: Introduce Air (Stretching)
Angle the jug so the tip sits just under the milk’s surface, slightly off-centre. Open the steam fully. You should hear a light, rhythmic “tss-tss-tss” as air is drawn in. Hold this for 3-5 seconds on a small jug, until the milk has grown by roughly a third.
Why: this is the only point where foam volume gets created. Every second after this is about texture and temperature, not more foam.
Step 3: Texture the Milk (Rolling)
Lower the jug so the tip sits deeper below the surface. Keep the wand off-centre so the milk spins in a tight whirlpool. Hold it there until you reach your target temperature.
Why: the whirlpool folds any large bubbles from Step 2 into microscopic ones. It also spreads the heat evenly, instead of scalding the milk near the tip.
Step 4: Hit Your Temperature and Stop
Close the steam valve the moment the jug feels too hot to comfortably hold — roughly 55-65°C. Turn the steam off before you pull the jug away, not after, to avoid a last splash of hot milk.
Why: milk sweetness peaks in this range, before the proteins start to break down. Past roughly 70°C, milk tastes scalded and foam can collapse.
Step 5: Tap, Swirl and Pour
Wipe and purge the wand immediately. Milk left inside it will bake on and block the tip. Tap the jug firmly on the counter to burst any large bubbles left over. Then swirl it in a tight circle until it looks glossy, like wet paint, with no visible bubbles.
Why: tapping and swirling are what turn steamed milk into microfoam. Skip this step and even a good stretch-and-texture ends up patchy on the pour.
Milk Temperature and Texture Targets
| Drink | Foam depth | Target feel |
|---|---|---|
| Flat white | Thin, roughly 5mm | Glossy, barely visible foam, silky pour |
| Cappuccino | Thick, roughly 10-15mm | Structured but smooth, holds its shape briefly |
| Latte | Thin, roughly 5-8mm | Similar to a flat white, slightly more volume |
| Macchiato | Dollop only | Dense, spoonable foam on top of the shot |
Working with alternative milks. Oat milk foams well but is more heat-sensitive — check temperature earlier than with dairy. Skimmed milk foams easily, but the foam collapses faster, so pour it promptly. Full-fat dairy is the most forgiving choice for anyone still learning, because the extra fat stabilises the bubbles.
Why Warm-Up Time Changes Your Steam
A cold machine gives weak, wet steam. Most commercial single-boiler machines — the Fracino Cherub among them — need around 15 minutes from switch-on to reach normal working pressure. Steam power builds through that window. It isn’t instant.
Boiler pressure on these machines typically runs at 1-1.2 bar once warmed up, against a maximum working pressure of 1.3 bar and a safety valve set at 1.6-1.8 bar. If your steam stays weak after a full warm-up, that’s a pressure or scale problem, not a technique one. Our no steam or low pressure fixes guide covers the causes.
Choosing a Machine for Consistent Steam
Any machine with a steam wand can make microfoam. Boiler size just affects how forgiving it is during a rush. Our full range comparison is in the electric coffee machines buyer’s guide — two models worth knowing as reference points:
Fracino Cherub CHE1 — single group, tank-fed, from £1,240. A 2.3L boiler and 2.85kW element. Good for a low-volume café steaming one or two jugs at a time. Best for a first machine or a slow site; expect a short recovery between back-to-back steams.
Fracino Bambino 2 Group Automatic — plumb-in, from £2,380. A 10L boiler and 2.85kW element gives far more steam in reserve. It copes better with several jugs steamed in quick succession. Best for a busier counter running two drinks at once.
Weighing up grinders too? Our coffee grinder buyer’s guide covers burr size and hopper capacity for a matching setup.
Fixing Common Milk-Steaming Problems
| Problem | Likely cause | Fix |
|---|---|---|
| Big, uneven bubbles | Stretched too long, or wand too near the surface | Cut the stretching time; move the tip slightly deeper once foam starts |
| Flat milk, no foam | Tip too deep, or missed the “tss-tss” stage | Start with the tip just under the surface until you hear air draw in |
| Scorched or burnt taste | Overheated past roughly 70°C | Stop steaming as soon as the jug is too hot to hold, not after |
| Milk splits or curdles | Old milk, or a low-fat milk pushed past temperature | Use fresh milk and stop earlier; alternative milks split more easily |
| Splashing or spitting | Wet wand, or steam opened before the tip is in the milk | Purge the wand first; submerge the tip before opening the valve fully |
| Weak steam even after warm-up | Boiler pressure or scale build-up | Not a technique fault — see the guide below |
Five Mistakes That Ruin Microfoam
- Walking away mid-steam. Temperature moves fast in the final seconds — keep a hand on the jug throughout.
- Stretching for too long. Nearly all the air goes in during the first few seconds. Stretching longer just makes big bubbles.
- Steaming warm or old milk. It foams unevenly and tips over temperature before it textures.
- Skipping the tap and swirl. Even a good steam looks patchy on the pour without it.
- Judging by time instead of feel. Boiler power varies between machines and even by time of day — counting seconds isn’t reliable.
FAQ
What temperature should milk be for microfoam?
Aim for roughly 55-65°C, or too hot to comfortably hold the jug against your palm. Sweetness peaks in this range, before milk proteins start to break down. Past about 70°C, milk tastes scalded and the foam can collapse.
Why does my milk have big bubbles instead of microfoam?
Big bubbles almost always mean you stretched too long, or held the tip too near the surface. Air only needs to go in for a few seconds. After that, move the tip slightly deeper so the milk folds instead of aerating further.
Can you make microfoam with skimmed milk?
Yes — it often foams even more easily than whole milk, since there’s less fat to stabilise the bubbles. The trade-off is that the foam collapses faster, so texture it slightly less and pour it promptly.
How do you steam oat milk without it splitting?
Use a barista-formulated oat milk where possible. Stop a few degrees earlier than you would with dairy — oat milk is more heat-sensitive and can split above roughly 60-65°C. Fresh, cold milk from the fridge also helps it hold together.
Why is my milk splitting or curdling?
Usually the milk was steamed past temperature, was close to its use-by date, or was a lower-fat milk pushed too hot. Use fresh milk, stop steaming earlier, and take extra care with skimmed or plant-based milks.
How long should you steam milk for a flat white vs a cappuccino?
Both use the same process — the difference is foam depth, not steaming time. Stretch briefly for both. Then aim for a thinner, glossier finish on a flat white, and a slightly thicker foam for a cappuccino.
Do you need a thermometer to steam milk properly?
Not once you’ve built up the feel for it, but it’s worth using while training new staff. Clip it to the jug and stop as soon as it reads roughly 55-65°C, then switch to judging by touch over time.
Why is my steam wand weak or not producing enough pressure?
Weak steam after a full 15-minute warm-up usually points to a boiler pressure or scale problem, not technique. Our no steam / low pressure guide walks through the likely causes and fixes.