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Gardena Smart Sileno Free 800m² specifications and in-depth review

Gardena Smart Sileno Free 800m²

Manufacturer: Gardena

The Gardena Smart Sileno Free 800m² is a robotic lawn mower designed for medium to large garden areas, offering autonomous operation with a recommended coverage of 800 m². It connects via Bluetooth to a dedicated smartphone app, allowing remote control and scheduling without requiring a Wi-Fi connection. The mower handles slopes of up to 30% and includes both obstacle and rain sensors, making it capable of adapting to changing outdoor conditions.

Weighing 13,820 g and measuring 430 mm wide by 630 mm deep, the unit runs on an 18.5V removable battery that charges in approximately 1.67 hours, drawing 43.37W during operation. Cutting height is adjustable across three settings ranging from 25 mm to 45 mm, with a 22 cm cutting width delivering a working area capacity of around 87.27 m² per hour. Additional features include mulching, auto docking, a frost sensor, and weather adaptation, while audible noise is rated at 58 dB standard and 50 dB in eco mode.

Pros
  • Handles slopes of up to 30%, making it suitable for gardens with uneven or inclined terrain
  • Includes a frost sensor and weather adaptation, allowing it to pause or adjust operation based on real conditions rather than a fixed schedule
  • The removable battery can be taken out for separate charging, adding practical flexibility to daily use
  • Operates at 50 dB in eco mode, keeping noise at a relatively low level during use
  • Supports scheduling and auto docking, enabling fully autonomous operation without manual intervention
  • Capable of mowing in rain and responds to precipitation via a built-in rain sensor
Cons
  • No anti-theft features, which is a notable gap for a device left outdoors unattended
  • Not compatible with Alexa or Google Assistant, limiting smart home integration options
  • Only three cutting height settings between 25 mm and 45 mm, offering limited adjustment range
  • Does not support Wi-Fi, relying solely on Bluetooth which may restrict connection range from the smartphone
  • Working area capacity of 87.27 m² per hour is relatively modest given the 960 m² maximum lawn coverage
Who is this for?

This mower is well matched to homeowners with medium to large gardens of up to 800 m², particularly those with sloped or uneven terrain since it handles inclines of up to 30%. Users who want a largely hands-off experience will appreciate the scheduling, auto docking, and weather adaptation features, which allow the mower to operate and return to base without supervision. It is also a practical option for those who prefer Bluetooth-based app control without the need for a full Wi-Fi setup, and for gardens where mowing through light rain is a regular requirement.

Who is this NOT for?

This mower is not well suited to users with gardens exceeding 960 m², as its maximum lawn coverage would be insufficient for larger properties. Those who rely on a connected smart home ecosystem will find it limiting, given the lack of compatibility with Alexa or Google Assistant. It is also a poor fit for users who require precise cutting height control, since only three height settings are available between 25 mm and 45 mm, which may not satisfy those who need finer adjustment. Additionally, users concerned about leaving outdoor equipment unattended may find the absence of any anti-theft functionality a significant drawback.

General info:

audible noise 58 dB
Has a dedicated smartphone app ✓
supports Wi-Fi ✕
audible noise (eco) 50 dB
Has Bluetooth ✓
cutting width 22 cm
Is electric ✓
height 260 mm
recommended area 800 m²
supports a remote smartphone ✓
lawn area coverage 960 m²
thickness 630 mm
volume 70434 cm³
weight 13820 g
width 430 mm

The Gardena Smart Sileno Free 800m² is an electric robotic lawn mower with a recommended coverage area of 800 m² and a maximum lawn area capacity of 960 m². It has a cutting width of 22 cm and comes with a dedicated smartphone app that supports remote control, though it relies on Bluetooth rather than Wi-Fi for connectivity. In terms of physical dimensions, the unit measures 430 mm wide, 260 mm tall, and 630 mm in depth, with a total volume of 70,434 cm³ and a weight of 13,820 g. Operating noise is rated at 58 dB under standard conditions and drops to 50 dB in eco mode.

Features:

has an obstacle sensor ✓
Has a rain sensor ✓
can be scheduled ✓
has anti-theft features ✕
auto docking ✓
works with Alexa ✕
compatible with Google Assistant ✕
Has a display ✕
has a frost sensor ✓
Has mulching feature ✓
adapts to weather conditions ✓
works in rain ✓

This robotic mower includes an obstacle sensor, a rain sensor, and a frost sensor, and it is capable of both working in rain and adapting to changing weather conditions. It supports scheduled operation and returns to its base automatically via auto docking, while the mulching feature allows it to recycle grass clippings directly into the lawn. The mower does not have a display, lacks anti-theft features, and is not compatible with Alexa or Google Assistant.

Performance:

slope performance 30%
mowing time 140 m
number of cutting height settings 3
maximum cutting height 45 mm
minimum cutting height 25 mm
working area capacity 87.27 m²/h

The mower handles slopes of up to 30% and delivers a working area capacity of 87.27 m²/h, with a mowing time rated at 140 m. Cutting height can be adjusted across three settings, spanning a range from a minimum of 25 mm to a maximum of 45 mm, allowing for some flexibility depending on the desired grass length.

Power:

charge time 1.67 hours
has a removable battery ✓
voltage 18.5V
wattage 43.37W

The mower runs on an 18.5V removable battery that fully charges in approximately 1.67 hours, drawing 43.37W during operation. The removable design allows the battery to be taken out for separate charging or replacement as needed.

Final Verdict

The Gardena Smart Sileno Free 800m² is a capable robotic lawn mower that covers gardens up to 960 m² and handles slopes of up to 30%, making it a practical choice for homeowners with moderately large or sloped outdoor spaces. Its autonomous operation — supported by scheduling, auto docking, weather adaptation, and a frost sensor — means it can run with minimal user involvement day to day. The reliance on Bluetooth rather than Wi-Fi, the absence of smart home integration, and the limited cutting height adjustment do narrow its appeal for more connected or precision-focused users. That said, for those who primarily want a reliable, self-managing mower that adapts to outdoor conditions without requiring a complex network setup, the Sileno Free 800m² delivers a well-rounded set of features that align closely with its intended use case.

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