Expresso

Priming, Purging, and Flushing an Espresso Machine

Prime, purge, and flush on an espresso machine are three water jobs, and manuals often print them as one. Prime fills an empty or air-logged pump path so a solid...

Priming, Purging, and Flushing an Espresso Machine

Prime, purge, and flush on an espresso machine are three water jobs, and manuals often print them as one. Prime fills an empty or air-logged pump path so a solid...

Flow Control and Pressure Profiling for E61 Mac...

Espresso flow control on an E61 is a variable orifice in the brew path—usually a needle valve or a paddle—that meters how fast water enters the group while the pump...

Flow Control and Pressure Profiling for E61 Mac...

Espresso flow control on an E61 is a variable orifice in the brew path—usually a needle valve or a paddle—that meters how fast water enters the group while the pump...

Pressure Gauge on Espresso Machines: How to Rea...

Updated October 2026. Written by the Kairos Coffee team. Pressure Gauge on Espresso Machines: How to Read It An espresso pressure gauge shows pressure in the circuit it is tapped...

Pressure Gauge on Espresso Machines: How to Rea...

Updated October 2026. Written by the Kairos Coffee team. Pressure Gauge on Espresso Machines: How to Read It An espresso pressure gauge shows pressure in the circuit it is tapped...

espresso machine warm up time cover

Espresso Machine Warm-Up Time: What Affects It

Updated October 2026 · Written by the Kairos Coffee team Espresso Machine Warm-Up Time: What Affects It Espresso machine warm up time is the wait between power-on and water at...

Espresso Machine Warm-Up Time: What Affects It

Updated October 2026 · Written by the Kairos Coffee team Espresso Machine Warm-Up Time: What Affects It Espresso machine warm up time is the wait between power-on and water at...

58mm vs 54mm Portafilter Compatibility: What Fits and What Does Not

58mm vs 54mm Portafilter Compatibility: What Fi...

58mm vs 54mm Portafilter Compatibility: What Fits and What Does Not 58mm vs 54mm portafilter compatibility is a size-family rule, not a quality ranking. The millimeter number describes the basket...

58mm vs 54mm Portafilter Compatibility: What Fi...

58mm vs 54mm Portafilter Compatibility: What Fits and What Does Not 58mm vs 54mm portafilter compatibility is a size-family rule, not a quality ranking. The millimeter number describes the basket...

Active Heated Group Head Explained: vs Thermosyphon E61

Active Heated Group Head Explained: vs Thermosy...

An active heated group head keeps the portafilter dock near brew temperature with dedicated heat—a saturated or bolted water jacket, or an electronic cartridge in the metal—while a thermosyphon E61...

Active Heated Group Head Explained: vs Thermosy...

An active heated group head keeps the portafilter dock near brew temperature with dedicated heat—a saturated or bolted water jacket, or an electronic cartridge in the metal—while a thermosyphon E61...