Bosch GDS 18V-300 Impact Wrench UK Review

Bosch’s GDS 18V-300 BITURBO is the German brand’s entry into the compact impact wrench category, using their BITURBO brushless motor technology to extract 300Nm of torque from a notably efficient power delivery system. At around £145 body only it is the most affordable tool in this batch of reviews, sitting slightly below the Makita DTW285Z in price while matching it closely in torque output. If you are already invested in Bosch’s 18V Professional platform – using the same batteries in a Bosch GSB 18V-55 combi drill or GTS 18V jigsaw – the GDS is the natural impact wrench addition.

We tested the GDS 18V-300 over several weeks on domestic and light construction tasks to understand whether the BITURBO technology delivers a genuine advantage over conventional brushless designs at this torque level. Here is what we found.

Overview and first impressions

The GDS 18V-300 is compact and well-proportioned. At 167mm from anvil tip to the back of the housing and 1.6kg without battery, it is almost identical in physical size to the DeWalt DCF894 but lighter and with a lower torque output. The navy blue Bosch Professional body styling is distinctive and the build quality feels solid throughout. The rubber overmould grip is comfortable and the ergonomics are well considered – the switch between forward and reverse modes sits naturally under the thumb without requiring a shift in grip.

The BITURBO motor technology is Bosch’s claim to efficiency – the brushless design prioritises consistent power delivery and heat management rather than peak torque figures, which means the 300Nm rating is delivered more reliably and with less battery drain than older brushed designs at the same rated output. Two speed/torque modes are selectable via a top-mounted button, which is a simpler setup than the three or four-mode competitors but covers the most common use cases adequately. The LED work light illuminates the working area well.

Specifications and scores

How it performed in our tests

The BITURBO motor technology shows its advantage most clearly in battery efficiency rather than peak torque. On standard wheel bolt removal and M10 structural bolt driving, the GDS 18V-300 performed comparably to the Makita DTW285Z at a similar torque rating – clean, consistent fastener removal without drama. Where it distinguished itself was in battery consumption: over the same test regime, the Bosch used noticeably less charge than the Makita, which is the BITURBO efficiency claim bearing out in practice.

The two-mode torque selector is simpler than the competition but works well. Mode 1 handles lighter assembly and finishing work with adequate control. Mode 2 delivers full power for removal and driving tasks. For most users the simplicity is an advantage rather than a limitation – you spend less time cycling through modes and more time using the tool. The vibration levels are low and the tool handles well for extended use. The friction ring socket retention holds securely through demanding tests with no ejection incidents.

Battery system and runtime

The GDS 18V-300 runs on Bosch’s 18V Professional battery platform – the same batteries used across the full Bosch Professional 18V range including the GSB combi drills, GWS angle grinders and GOP multi-tools. Bosch’s 18V Pro batteries range from 2.0Ah to 8.0Ah, with ProCORE18V high-output cells delivering improved power density for sustained heavy use. For most impact wrench tasks, the standard 4.0Ah or ProCORE 4.0Ah are the practical choice.

The BITURBO efficiency advantage translates into noticeably better runtime than competing tools at the same torque level. In testing with a 4.0Ah battery, the GDS 18V-300 completed more fastener cycles before reaching low charge than the Makita DTW285Z with a similarly rated battery. For anyone who does extended work sessions and wants to minimise battery swaps, the Bosch is the most efficient tool in this group at the compact torque level.

Performance and limitations

The 300Nm maximum torque places the GDS 18V-300 firmly in the compact class, and on particularly stubborn or seized fasteners it will reach its limits. It is not designed to compete with the high-torque mid-range tools and will not match the DeWalt DCF894 or Milwaukee BLIWF12 on genuinely difficult removals. The two-mode selector, while simple and practical, offers less fine-grained control than three or four-mode competitors for applications where precise torque control matters. These are expected limitations for a tool in this class and price range rather than genuine weaknesses.

Final verdict – is it worth it?

The Bosch GDS 18V-300 BITURBO makes a strong case for itself on battery efficiency grounds alone. The BITURBO technology genuinely delivers better runtime per charge than comparable compact tools – a meaningful advantage for extended use sessions. Paired with the friction ring socket retention, the low vibration levels and the competitive price, it is a well-rounded compact impact wrench that performs reliably across all typical DIY and light trade applications.

The decision between the GDS and the Makita DTW285Z comes down primarily to ecosystem – both tools perform comparably in use, both are priced similarly, and both are well made. For existing Bosch Professional users, the GDS is the obvious choice. For platform newcomers, the Makita’s four torque modes give it a slight practical edge in versatility, while the Bosch’s efficiency advantage is most valuable for users who frequently run extended sessions. Either way, both represent good value in the compact cordless tool category and will serve most UK DIYers and light trade users well for years.