Expresso
Heat Exchanger vs Dual Boiler for Home Baristas
For home baristas stepping up from entry-level setups, the choice between a heat exchanger vs dual boiler espresso machine is the ultimate fork in the road. If your daily routine...
Heat Exchanger vs Dual Boiler for Home Baristas
For home baristas stepping up from entry-level setups, the choice between a heat exchanger vs dual boiler espresso machine is the ultimate fork in the road. If your daily routine...
OPV Espresso Pressure Adjustment Guide: What It...
If you have spent any time in home barista forums, you have likely run into the acronym "OPV." The Over-Pressure Valve is one of the most critical yet misunderstood components...
OPV Espresso Pressure Adjustment Guide: What It...
If you have spent any time in home barista forums, you have likely run into the acronym "OPV." The Over-Pressure Valve is one of the most critical yet misunderstood components...
E61 Group Head Explained: Thermosyphon, Pre-Inf...
The E61 group head is the most recognizable icon in the history of home and commercial espresso. Patented in 1961 by Ernesto Valente for the Faema E61 espresso machine, this...
E61 Group Head Explained: Thermosyphon, Pre-Inf...
The E61 group head is the most recognizable icon in the history of home and commercial espresso. Patented in 1961 by Ernesto Valente for the Faema E61 espresso machine, this...
Water for Espresso Machines: TDS, Hardness & Fi...
Updated August 2026 · Written by the Kairos Coffee team Water for Espresso Machines: TDS, Hardness & Filters Espresso machine water is the solvent that becomes your shot—and the chemistry...
Water for Espresso Machines: TDS, Hardness & Fi...
Updated August 2026 · Written by the Kairos Coffee team Water for Espresso Machines: TDS, Hardness & Filters Espresso machine water is the solvent that becomes your shot—and the chemistry...
Espresso Group Head Types: E61, Saturated, Semi...
Updated September 2026 · Written by the Kairos Coffee team Espresso Group Head Types: E61, Saturated, Semi-Saturated & Thermoblock Groups Espresso group head types describe how the brew chamber that...
Espresso Group Head Types: E61, Saturated, Semi...
Updated September 2026 · Written by the Kairos Coffee team Espresso Group Head Types: E61, Saturated, Semi-Saturated & Thermoblock Groups Espresso group head types describe how the brew chamber that...
Espresso Pressure Explained: 9 Bar, 15 Bar, OPV...
Updated September 2026 · Written by the Kairos Coffee team Espresso Pressure Explained: 9 Bar, 15 Bar, OPV & What the Puck Actually Sees Espresso pressure explained in one honest...
Espresso Pressure Explained: 9 Bar, 15 Bar, OPV...
Updated September 2026 · Written by the Kairos Coffee team Espresso Pressure Explained: 9 Bar, 15 Bar, OPV & What the Puck Actually Sees Espresso pressure explained in one honest...