Using the Preheat Control System
The Preheat Control System is integrated into the base of the 58 Plus 2. Its purpose is to maintain the temperature of the brew head during and between shots — it is not designed to heat your brew water. Always heat brew water separately in a kettle. The system has three temperature settings corresponding roughly to different roast levels:
- Low — ~85°C / 185°F: Suited to dark roasts, which extract optimally at lower temperatures.
- Medium — ~90°C / 194°F: Suited to medium roasts and a versatile everyday starting point.
- High — ~95°C / 203°F: Suited to light roasts, which typically require higher temperatures for full extraction.
To turn on: press and hold the button for 3 seconds. The left light will blink. Press the button again to cycle to Medium (center light blinks, then goes solid when reached). Press again twice for High (right light blinks, then all lights go solid when reached). Allow a few minutes for the brew head to reach the selected temperature before inserting the portafilter and filling with water. To turn off: press and hold the button for 3 seconds until all lights go out.
Detachable Power Supply
The compact power supply on the 58 Plus 2 unplugs from the base, allowing you to brew off-grid using manually preheated water. To brew without electricity, preheat the brew cylinder by sealing the bottom with the preheat cap, filling with boiling water for 45 seconds, discarding the water, and repeating as needed. Remove the cap, install the brew cylinder onto the brew base, and proceed with your normal workflow.
Using the Valve Plunger
The valve plunger allows you to add brew water to the brew head without removing the plunger stem. Align the stem tabs with the slots on the valve plunger and rotate to lock. Fill with just-boiled water through the top of the plunger opening. This significantly improves workflow when brewing multiple shots back-to-back.
Choosing a Portafilter Basket
The 58 Plus 2 includes both a high-flow and a low-flow portafilter basket. The low-flow basket produces greater resistance and is better suited to finer grinds and lighter roasts. The high-flow basket provides less resistance and suits coarser grinds and darker roasts. Experiment with both to find what works best for your coffee and workflow.
Reading the Pressure Gauge
The pressure gauge is your primary feedback during extraction. Target the Espresso Zone of 6–9 BAR for the duration of the shot, aiming for a brew time of 30–35 seconds. Use this as a guide:
- Below 6 BAR: Insufficient pressure — grind finer or apply more force.
- 6–9 BAR: Target zone — you are in a good extraction range.
- 10–12 BAR: Pressure is high — consider a coarser grind or ease off the lever.
- Above 12 BAR: Stop immediately. Ease off the lever and discard the puck. Do not continue brewing above 12 BAR.
Pre-Infusion
For a smoother extraction, especially with light roasted coffees, lower the lever slowly until the gauge reads approximately 2 BAR and hold for 5–10 seconds to allow the grounds to saturate before building to full pressure. This can help reduce channeling and produce a more even extraction.
Purging After Each Shot
After raising the lever at the end of a shot, place an empty cup on the drip tray and lower the lever again briefly to expel any remaining liquid from the brew head. Repeat as needed until the flow stops. This keeps the brew head clean and ready for the next shot.