OTTO SIENA 65 Timer Dosing Grinder

65mm Flat Burr Precision for Light Commercial Coffee Setups

The OTTO SIENA 65 Timer Dosing Grinder is designed for cafés, bakeries, restaurants and F&B businesses that need a reliable espresso grinder for light commercial use, with recommended daily coffee consumption of up to approximately 2kg.

With 65mm hardened flat burrs, stepless micrometric adjustment, timer dosing and a 1.2kg bean hopper, the SIENA 65 gives operators the consistency and control needed for everyday espresso service without moving into a much larger high-volume commercial grinder.

Designed in Florence, Italy, it is a practical option for businesses that want a serious café grinder with straightforward operation and precise grind adjustment.

Best For

The OTTO SIENA 65 is best suited for:

• Small cafés

• Bakeries and dessert shops

• Restaurants serving espresso-based drinks

• F&B outlets adding a dedicated coffee programme

• Boutique hospitality setups

• Lower-volume commercial coffee counters

• Businesses using up to approximately 2kg of coffee per day

• Operators who prefer hopper-based timer dosing

Why Choose the OTTO SIENA 65?

65mm Hardened Flat Burrs

The SIENA 65 uses 65mm hardened flat burrs designed for consistent commercial grinding.

Larger flat burrs help support more stable particle size and efficient grinding during repeated espresso preparation.

For businesses serving coffee throughout the day, this gives you a more capable platform than many smaller home-oriented grinders.

Stepless Micrometric Regulation

One of the key features of the SIENA 65 is its Stepless Micrometric Regulation, based on a Conti Valerio srl patented system.

Instead of being restricted to fixed grind settings, the grinder gives you effectively infinite adjustment points.

This helps when dialling in espresso because you can make very small changes to the grind size as coffee, humidity, extraction time or recipe changes.

Timer Dosing for a More Repeatable Workflow

The SIENA 65 is designed around timer dosing, making it easier to repeat a similar amount of ground coffee from shot to shot.

For a commercial setting, this can help simplify workflow and improve consistency compared with manually estimating each dose.

It is particularly useful when multiple staff members are working with the same grinder.

1.2kg Bean Hopper

The 1.2kg hopper gives you enough capacity for a working commercial coffee station without the need to refill constantly.

This is especially useful for cafés and restaurants that use one main house coffee throughout service.

Up to Approximately 2kg Daily Coffee Usage

The SIENA 65 is recommended for light commercial use of up to approximately 2kg of coffee per day.

This makes it suitable for lower-volume commercial operations that still need a proper café grinder.

Rather than looking only at a theoretical number of cups, consider whether your actual service pattern, peak-hour demand and menu fit within this level of grinder workload.

What Does 1–3g/s Productivity Mean?

The grinder is rated at approximately 1–3 grams per second, depending on grind setting and coffee.

For espresso preparation, this gives a practical speed for light commercial service while still allowing precise grind adjustment.

The actual grinding speed will vary according to:

• grind fineness

• coffee bean density

• roast level

• dose size

Why Choose This Instead of a Home Grinder?

A home grinder may work well for a few coffees at a time.

A light commercial environment usually requires:

• repeated grinding throughout service

• a larger hopper

• more durable burrs

• more consistent dosing

• easier adjustment

• a workflow that different staff can repeat

The SIENA 65 is designed around these commercial needs.

Why Choose It Instead of a Larger Commercial Grinder?

Not every business needs a very large grinder.

A larger commercial grinder may be unnecessary if:

• coffee volume is moderate

• space is limited

• espresso is important but not the only revenue category

• daily coffee usage remains below approximately 2kg

• you want commercial consistency without overinvesting in capacity

The SIENA 65 sits in a useful middle ground between a home grinder and a high-volume café grinder.

Who Should Buy the OTTO SIENA 65?

Choose this grinder if:

• you run a small or light-volume café

• you serve espresso-based drinks consistently throughout the day

• you want timer dosing for easier repeatability

• you prefer a hopper-based commercial workflow

• you need precise stepless grind adjustment

• your expected daily coffee usage is within approximately 2kg

Who Should NOT Buy It?

The SIENA 65 may not be the right grinder if:

• you need a high-volume grinder for a very busy café

• your coffee usage regularly exceeds around 2kg per day

• you frequently switch between different coffee beans

• you prefer a single-dose workflow

• you are buying only for occasional home use

For those situations, a higher-capacity commercial grinder or a single-dose grinder may be more suitable.

Recommended Pairing

The OTTO SIENA 65 pairs well with:

• semi-commercial espresso machines

• 1-group commercial coffee machines

• compact 2-group café machines

• espresso bars using one main house coffee

• light commercial café setups

The grinder should be matched to the actual espresso machine, menu and peak-hour workflow rather than chosen in isolation.

Key Specifications

Brand: OTTO
Model: SIENA 65
Product Type: Timer Dosing Coffee Grinder
Burr Size: 65mm Flat Burr
Burr Material: Hardened Burrs
Adjustment: Stepless Micrometric Regulation
Grinding Productivity: Approx. 1–3g/s
RPM: 1350 RPM
Motor Power: 320W
Bean Hopper Capacity: 1.2kg
Recommended Usage: Light commercial, up to approx. 2kg coffee per day
Weight: 8.5kg
Dimensions: W243mm × H595mm × D213mm
Colours: White / Black
Design: 100% designed in Florence, Italy

Prices exclude delivery and postage charges.

What Problem Does the OTTO SIENA 65 Solve?

Inconsistent Espresso

The stepless micrometric adjustment gives you finer control when dialling in espresso.

Slow or Repetitive Manual Dosing

Timer dosing helps make repeated service easier and more consistent.

Small Home Grinder Becoming a Bottleneck

The 65mm burrs, 1.2kg hopper and light-commercial design give you a more appropriate platform for ongoing café use.

Buying More Grinder Than You Actually Need

If your operation is not high-volume, the SIENA 65 gives you commercial capability without moving immediately into a much larger grinder.

Why Buy the OTTO SIENA 65 from Biji-Biji?

Biji-Biji helps customers choose grinders based on how the business actually operates, not simply on burr size or headline capacity.

We can help you consider:

• your coffee menu

• your espresso machine

• peak-hour workflow

• average coffee consumption

• whether you use one house coffee or several beans

• your available counter space

• your budget

The goal is to match the grinder to the business rather than simply recommending the biggest model available.

Need Help Choosing?

Not sure whether the OTTO SIENA 65 is enough for your setup?

Tell us:

• which espresso machine you use

• what drinks you serve

• your expected peak-hour workflow

• whether you use one house bean or several coffees

• how important coffee is to your overall business

and the Biji-Biji team can help you compare suitable grinder options.

WhatsApp Biji-Biji and ask about the OTTO SIENA 65 Light Commercial Coffee Grinder.