Rocket Doppia (2 Group)
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Rocket RE Doppia 2 Group Dual Boiler Commercial Espresso Machine
The Rocket RE Doppia 2 Group is a commercial dual-boiler espresso machine built for cafés that need thermal stability, repeatable volumetric service and strong steam recovery. A dedicated 4-liter coffee boiler separates brew-temperature management from the 9-liter main steam boiler, while fully saturated groups and PID regulation support consistent extraction through changing service volume.
Automatic portion control, integrated shot timing, adjustable cup clearance and cool-touch steam wands make Doppia a practical step above a conventional heat-exchange machine. It is intended for specialty cafés, restaurants and high-volume bars that want more temperature separation without moving to a separate brew boiler for every group.
Why Choose the Rocket Doppia?
Commercial dual-boiler architecture
The coffee and steam systems are separated. Brew-temperature changes do not require changing steam-boiler pressure, and the 9-liter service boiler maintains steam and hot-water capacity during a rush.
Fully saturated groups
The groups are integrated closely with the brew system to reduce temperature drift and improve repeatability across consecutive shots. Proper warm-up and calibration remain essential.
PID and pressure-transducer control
PID regulation manages brew temperature, while a pressure transducer controls the steam system and supports responsive recovery. These systems provide a more precise baseline than a simple pressurestat HX machine.
Automatic volumetric dosing
Programmed portions let baristas begin an extraction and move to milk or drink assembly. Recipes still need to be checked by weight because coffee age, grind and puck resistance can change output.
Adjustable tall-cup platform
Cup clearance can be set between approximately 80mm and 130mm, allowing the bar to switch between espresso cups, scales and takeaway vessels.
Rocket Doppia 2 Group Specifications
| Machine type | Commercial 2-group dual-boiler espresso machine |
|---|---|
| Groups | 2 fully saturated groups |
| Coffee boiler | 4 L |
| Steam/main boiler | 9 L |
| Temperature control | PID for brew system; pressure transducer for steam recovery |
| Portion control | Automatic volumetric |
| Shot timer | Standard |
| Cup clearance | Adjustable approximately 80–130mm |
| Steam | Cool-touch stainless steam wands |
| Power | 5.0 kW |
| Dimensions | 848 mm W × 603 mm D × 500 mm H (33.4 × 23.7 × 19.7 in) |
| Body | AISI 304 stainless steel |
| Boiler material | AISI 316L stainless steel |
Workflow and Capacity Planning
The Doppia suits locations where two groups, stable brew conditions and strong steam are required through concentrated demand. Model the busiest 15 minutes, percentage of milk drinks, hot-water demand, cup sizes and staffing. Pair it with grinders that can recover quickly after adjustments and consider a second grinder for decaf, alternate espresso or redundancy.
Compared with the Boxer 2 Group, Doppia adds separated brew and steam boilers, PID regulation and saturated groups. Compared with the R9, it uses one shared 4-liter coffee boiler rather than an individual brew boiler for each group. That makes Doppia a strong middle platform for shops prioritizing stability and value.
Doppia vs. Boxer 2 Group vs. R9
| Model | Brew architecture | Best fit |
|---|---|---|
| Boxer 2 Group | 13.2 L copper HX boiler | Compact two-group value |
| Doppia 2 Group | 4 L coffee + 9 L steam boiler | Dual-boiler stability and saturated groups |
| R9 2 Group | Two 1.9 L brew boilers + 9 L steam | Different temperatures by group |
Installation and Water Requirements
Doppia requires a dedicated commercial circuit, direct water, drainage and suitable water treatment. Confirm voltage and phase for the exact North American unit before purchase. Test incoming hardness, alkalinity, chloride and total dissolved solids so the treatment protects stainless boilers while producing good espresso. Provide an accessible shutoff and service clearance.
Cleaning and Preventive Service
Backflush each group according to drink volume, clean baskets and screens, purge steam before and after milk use, and verify volumetric programming daily. Replace water-treatment cartridges based on measured capacity rather than the calendar alone. Schedule preventive maintenance for seals, safety devices and steam performance before failures affect service.
Build a Rocket Commercial Bar
Compare all Rocket commercial espresso machines and the complete Rocket collection. Match the Doppia with appropriately sized commercial grinders for primary espresso, decaf and peak-volume redundancy.
Frequently Asked Questions
Is the Rocket Doppia a dual boiler machine?
Yes. It uses a 4-liter coffee boiler and separate 9-liter steam/main boiler.
Does each group have its own boiler?
No. The two groups share the 4-liter coffee boiler. Choose the R9 when independent brew boilers by group are required.
Are the groups saturated?
Yes. Rocket specifies fully saturated groups for thermal stability.
Does it have PID control?
Yes. PID manages the brew system, while a pressure transducer controls steam recovery.
Does it offer volumetric dosing?
Yes. Automatic portion control supports programmed recipes.
Is a shot timer included?
Yes. Rocket lists the shot timer as standard.
What cup sizes fit?
The adjustable platform supports approximately 80mm to 130mm of clearance.
What power does it require?
The 2-group model is rated at 5.0kW. Confirm voltage, phase, amperage and connection before ordering.
Does it have a water tank?
No. It is a plumbed commercial machine requiring direct water and drainage.
Is a grinder included?
No. Commercial grinders should be selected around the menu and peak demand.
What warranty is included?
A one-year Espresso Outlet warranty applies; confirm labor, travel and installation terms for the project.
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