Coffee Gear PicksBreville Dual Boiler Pre Infusion Settings (2026)
Start your Breville Dual Boiler near the documented factory baseline: 7 seconds at 60% pump power. Change one setting only after dose, grind, distribution and yield are repeatable.
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Set up pre-infusion in four steps
Keep the recipe steady before changing the gentle wetting stage
- Record dose and yield
- Start near 7 seconds / 60%
- Press MENU + MANUAL
- Check duration and power
- Use the same preparation
- Stop at the same yield
- Taste after cooling slightly
- Log one change at a time
A repeatable starting point and a clear next experiment, not a guaranteed recipe
Which settings should you start with?
Use approximately 7 seconds at 60% pump power, the factory baseline described by Seattle Coffee Gear. Pre-infusion gently wets the packed grounds before full extraction. This is a starting point for comparison, not a final light-roast recipe or a promise of sweeter espresso.
Whole Latte Love notes that gentle, low-flow pre-infusion can help high-density light-roast single origins. Explore it when your shots are repeatable but still need fine-tuning. For a wider platform comparison, see Best Espresso Machine Dual Boiler (2026).
What do you need before programming?
Have your BES920 warmed up, a scale ready and one coffee recipe written down. Use the same basket and beans throughout the comparison. Check the model label first: these button instructions follow the official Breville BES920 instruction manual, not every machine sold under the Dual Boiler name.
- Espresso-capable grinder and a clean, dry basket
- Scale for weighing both grounds and espresso
- Tamper and a consistent way to spread grounds evenly
- Notebook for settings, shot timing and taste
How do you program and compare pre-infusion?
Enter the BES920’s dedicated pre-infusion menu, record both settings and pull a shot with your normal recipe. Compare only one small change next. The manual separates duration from power, so you can explore either without changing both. Keep brew temperature and the amount of espresso in the cup fixed.
1. Establish your baseline
Write down dose (dry coffee weight) and yield (espresso weight). For example, use 18 g in and 36 g out if that dose suits your basket. This is an experiment recipe, not a bean-specific recommendation. Get two reasonably similar shots before editing pre-infusion.
2. Enter programming mode
With the machine on and at operating temperature, press MENU and MANUAL together. The BES920 manual labels duration Pd and power PP. Use MENU to move between them and the up/down arrows to adjust. Record the existing values; set the starting point, then press EXIT to return to standby.
3. Pull a controlled shot
Use the same shot button and stop at your chosen yield with the scale. Record time from button press and time to first drops separately. As Espresso Aficionados’ Breville guide explains, holding MANUAL for deliberate pre-infusion is a different workflow from editing automatic duration. Don’t mix the two during this comparison.
Home-Barista discussions are useful anecdotal context here: some owners experiment with lower power or a longer pre-wet, particularly for light roasts. Treat those preferences as ideas for your log, not as test results or universal settings.
4. Evaluate and record
Taste after the espresso cools slightly. Note bright fruit, sweetness, sharp sourness or a drying finish. As a small first experiment, compare 8 seconds with 7 while leaving power at 60%. Repeat before keeping the change. Explore power separately later; revert if the cup gets worse.
Which mistakes muddy the comparison?
Don’t treat pump percentage as pressure in bars, or judge a setting by how pretty the stream looks. Breville calls PP pump power; it is not a precise pressure target. Seattle Coffee Gear also cautions that its taste results are not universal. Your cup matters more than copying someone’s numbers.
- Changing the timing reference: always record from the same starting point.
- Chasing one lucky shot: repeat a promising setting before saving it.
What should you fix when shots go wrong?
Fix obvious grind or preparation problems before stretching the wetting stage. Breville’s BES920 manual identifies grind size and dose as key espresso controls. Pre-infusion is a fine-tuning tool, not a repair shortcut. If water delivery changes suddenly at unchanged settings, stop experimenting and follow Breville’s troubleshooting guidance.
Sour and rushing through
Leave pre-infusion fixed and try a slightly finer grind. Weigh the output rather than trusting cup volume. If flow is steady but taste stays sharp, compare a slightly longer yield separately.
Barely dripping or uneven flow
Check basket loading and spread the grounds evenly before tamping. Try a coarser grind if the shot stalls. Don’t increase power simply to force water through.
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Frequently asked questions
What is the default Breville Dual Boiler pre-infusion setting?
Seattle Coffee Gear describes the factory starting point as approximately 7 seconds at 60% pump power. Check your saved settings before changing anything, especially on a used machine. Treat those numbers as a reference, not the best recipe for every bean.
How long should pre-infusion be for light roast espresso?
Start around 7 seconds, then compare a small duration change while keeping power and your recipe fixed. Whole Latte Love notes that gentle pre-infusion can help dense light-roast single origins. That does not establish one ideal duration, so keep the setting that tastes better across repeat shots.
Can you change pre-infusion pressure on a BES920?
You can change pre-infusion pump power, not set a precise pressure in bars. The Breville BES920 instruction manual calls this control PP, separate from duration, Pd. A 60% power setting does not mean 60% of the machine’s extraction pressure.
Does longer pre-infusion fix sour espresso?
No, longer pre-infusion is not a reliable fix for sour espresso. Seattle Coffee Gear’s experiments found that taste results were not universal. Check grind and yield first, then compare pre-infusion settings. Aim for bright fruit with some sweetness, rather than a sharp, lemon-juice finish.
Should you adjust grind before pre-infusion?
Yes, get the grind and recipe repeatable before fine-tuning pre-infusion. The Breville BES920 instruction manual treats grind size and dose as core parts of espresso preparation. Leave the wetting settings alone while correcting a shot that gushes through or barely drips.