Rancilio S27 - Owners Diary

Last Updated: 27.03.2025

General Information

• Measurements: 380 x 465 x 515 mm (WxHxD)
• Power draw: 230V, 50Hz, 2050W
• Boiler capacity: 3.9L
• Weight: 35 kg

Volumetrics

Setting the volumetrics

1. Press and hold the right most button (the one which doesn’t picture a cup) until water stops flowing out of the group head, and it starts blinking to enter programming mode
2. Put in your portafilter
3. Press the button you want to program
4. Press the rightmost button again to stop the flow and store the value
5. Press the rightmost button again to exit programming mode

Standard Deviation

When using the volumetrics to pull a 18g in / 36g out shot of espresso, I observed a standard deviation of just 2.02g, which is pretty good.

Grounding of the Flowmeter

I ran into a small issue where the Flowmeter wouldn’t report flow in an understandable and reproducible way.

This happened because some scaling had occurred on the flowmeter itself due to a brittle O-ring. Once I replaced it and sanded down the Flowmeter, so the grounding wire made contact to ground again, the flowmeter works flawlessly once more.

Hardware Exploration

Pinout of the Keypad

Doses are counted from the left of the keypad to the right