Espresso Brew Temperature

Introduction

Importance of brew temperature for all coffee brewing methods, especially espresso.
Common source of confusion and frustration among espresso makers.
Aim to demystify brew temperature in espresso making.

Brew Temperature Definition: Refers to the temperature of water entering the basket, not the temperature of espresso in the cup.
Espresso will always be cooler than the brew temperature (15-20°C difference).
- Expected espresso temperature: Mid to high 70s or very low 80s in Celsius (170-180°F).
If espresso is below 70°C (160°F), there might be an issue to consider.

Impact of Pressure:
- Machines with thermal coil or thermal block require pressure for expected brew temperature.
- Fast-running shots due to coarse grind reduce pressure, leading to cooler brew temperature.
- Misunderstandings lead to returns of machines believed to be faulty.
Correct Measurement Method:
- Incorrect: Measuring water entering cup directly from group/portafilter.
- Correct: Use a dual wall basket to create pressure, resulting in higher water temperature.

Importance of Preheating:
- Machine's ready light indicates water heater is up, but not the entire brew path.
- Pulling a shot immediately may result in cooler brew temperature.
Turbo Flush Technique:
- Use dual wall pressurized baskets for preheating to achieve full brew temperature.

Effectiveness:
- Prevent cups from acting as heat sinks.
- Commercial setup: Cup warmers to heat bottoms of cups.
- Home machines may lack cup warmers, making preheating essential.
Method:
- Utilize the portafilter turbo flush process to also preheat cups.

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These notes provide a concise guide to understanding and managing espresso brew temperature, focusing on practical advice to ensure optimal outcomes.