Rotak 40 ErgoFlex

Detailed Review

The Bosch Rotak 40 ErgoFlex represents the pinnacle of electric lawnmower design, combining Bosch’s legendary engineering quality with thoughtful ergonomic features that make lawn care genuinely enjoyable.

First Impressions

Unboxing the Rotak 40, you immediately notice Bosch’s attention to detail. The build quality is exceptional, with robust plastic construction that feels premium rather than flimsy. The ErgoFlex handle system is the standout feature - it allows you to adjust the handle position to suit your height and mowing style, significantly reducing back strain during use.

Performance

The 1700W PowerDrive motor provides ample power for medium-sized gardens. We tested it on both freshly cut grass and longer, damper growth after a week’s holiday, and it handled both scenarios admirably. The motor maintains consistent power even when the grass box approaches capacity, which is often where cheaper models struggle.

The 40cm cutting width strikes a perfect balance - wide enough to cover ground quickly but narrow enough to navigate around obstacles with ease. Six cutting height settings (20-80mm) cater to different seasons and grass types, with smooth adjustment via a single lever.

Grass Collection

The 40-liter grass box is generous for an electric mower of this size. In practice, you’ll complete most average gardens with just 2-3 empties. The box features a viewing window so you can see when it’s full without constantly checking, and the clips that secure it to the mower are robust and easy to operate.

Bosch’s airflow system ensures excellent grass collection even in damp conditions. We achieved around 90-95% collection rates in our tests, with very little grass left on the lawn requiring a second pass.

Ergonomics and Handling

The ErgoFlex handle system is genuinely innovative. Rather than fixed handles, you can slide them forward or back by up to 15cm, finding your perfect pushing position. Taller users will particularly appreciate this feature. The handles themselves are comfortable, with adequate padding that prevents hand fatigue.

At 14kg, the Rotak 40 isn’t the lightest electric mower, but the weight distribution is excellent. It feels stable and planted rather than skittish, which is beneficial when mowing on slight slopes or uneven ground.

Edge Cutting

The integrated grass combs on either side of the cutting deck allow you to mow right up to walls and borders. While not quite as precise as a quality cylinder mower, they significantly reduce the amount of strimming required to finish off your lawn.

Build Quality and Durability

Bosch’s reputation for quality is well-earned. The Rotak 40 feels like it will last for many years of regular use. The motor is protected by thermal overload cutout, the cables are securely routed, and even small details like the blade fastening system speak to careful engineering.

The wheels are large and grippy, with the rear wheels featuring a decent tread pattern that maintains traction even on wet grass. They’re mounted on sturdy axles that show no signs of flex or wobble.

Storage

The folding handle mechanism is straightforward and secure. When folded, the mower stands upright and occupies minimal floor space - essential for those with limited shed or garage storage. The grass box nests neatly on top of the main body when stored.

Value for Money

At £299.99, the Rotak 40 ErgoFlex sits in the mid-to-upper price range for electric mowers. However, the combination of performance, build quality, and ergonomic features justifies the premium. This isn’t a mower you’ll be replacing in two years - it’s an investment in hassle-free lawn care for many seasons to come.

Who Is It For?

The Bosch Rotak 40 ErgoFlex is ideal for:

• Gardens between 200-500m² with reasonable access to power outlets
• Users who value quality and are willing to pay for it
• Anyone who has experienced back pain with traditional mower designs
• Families where different-height users share mowing duties
• Gardeners who mow regularly and want consistent, reliable performance

Who Should Look Elsewhere?

Consider alternatives if:

• Your garden is very small (under 150m²) - you don’t need this much power
• You require cordless operation
• You’re on a tight budget and prioritize price over features
• Your garden has extremely complex layouts with many obstacles

Final Verdict

The Bosch Rotak 40 ErgoFlex earns our highest recommendation and our rare 5/5 rating. It excels in every area: performance, build quality, ergonomics, and user experience. Yes, you’ll pay more than for a basic electric mower, but the superior cutting performance, reduced physical strain, and longevity make it an investment that pays dividends with every use.

For medium-sized gardens and users who want electric mowing without compromise, the Rotak 40 ErgoFlex represents the best choice currently available. It’s a genuine pleasure to use and will serve you reliably for years to come.