Kees van der Westen Speedster vs La Spaziale S1 Vivaldi II
Technical comparison · Dual boiler
Speedster and S1 Vivaldi II aren't playing the same game: an eleven-times price gap separates a professional bar machine from a semi-professional dual boiler for a serious home setup. Comparing them spec by spec misses the point; the point is who each one serves.
| Parameter |
Speedster
Kees van der Westen
F5 · Professional
|
S1 Vivaldi II
La Spaziale
F4 · Semi-professional
|
|---|---|---|
| Identity | ||
| Use tier | F5 — Professional | F4 — Semi-professional |
| Price | ||
| Price (€) | ~11000–25000 € | ~1000–2200 € |
| Price updated on | 09/2026 | 09/2026 |
| Universal specs | ||
| Dimensions (W×D×H) (cm) | — | 41.5 × 41.5 × 38.5 cm |
| Weight (kg) | 45 kg | 28 kg |
| Voltage (V) | 220 V | — |
| Category specs | ||
| Boiler architecture | Dual boiler | Dual boiler |
| Portafilter diameter (mm) | — | 53 mm mm |
| PID control | Yes | — |
| Brew pressure (bar) | 9 bar | — |
| Pump type | Rotary | Rotary |
| Pre-infusion | Passive spring | Programmable |
| 3-way solenoid valve | Yes | Yes |
| Group head type | Saturated group | E61 |
| Boiler material | Stainless steel | — |
| Steam wand | Manual steam wand | Manual steam wand |
| Plumbable | Yes | Yes |
| Pressure gauge | Yes | Yes |
The differences that matter
- Pre-infusion: Speedster passive spring, mechanical · S1 Vivaldi II programmable
- Group head: Speedster saturated group · S1 Vivaldi II E61
- Weight: Speedster 45 kg, built for a fixed counter · S1 Vivaldi II 28 kg
Which one to choose
Choose Speedster if…
Speedster is built for a counter running all day: saturated group, rotary pump, stainless steel boiler, 45 kg of thermal mass staying stable under a rush of orders. Passive spring pre-infusion is mechanical, not a setting you program.
Choose S1 Vivaldi II if…
S1 Vivaldi II brings the E61 group and programmable pre-infusion into a 28 kg package at a fraction of Speedster's price — the sensible pick for anyone who wants a serious dual boiler without running a commercial bar.
Where to buy
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