DeWalt D25899K-QS SDS-Max 10 kg demolition hammer: 1500 W and 17.9 Joules for demanding demolitions
The DeWalt D25899K-QS is a professional SDS-Max demolition hammer in the 10 kg class , designed to tackle demanding jobs on cement, concrete, screeds, flooring and masonry.
With a powerful 1500 W motor and an impact energy of up to 17.9 Joules , it is a machine designed for those who need a demolition capacity that is significantly higher than that of traditional 5 kg class demolition hammers.
The weight of approximately 9.9 kg becomes an integral part of the work: during downward demolition, it helps to effectively transfer energy to the material, reducing the need to continuously push on the machine.
The D25899K-QS is also a Made in Italy product and is supplied with a professional SDS-Max attachment, ideal for using robust chisels intended for heavy-duty work.
Who is this demolition hammer suitable for?
- Construction companies
- Bricklayers and renovation professionals
- Installers who carry out major demolitions
- Who needs to remove screeds and flooring
- Those who frequently work on cement and concrete
- Those looking for a professional demolition hammer that is more powerful than the classic 5 kg models
- Private individuals engaged in major renovations
Why choose DeWalt D25899K-QS?
17.9 Joules of impact energy
This is the data that immediately identifies the machine's category: a high impact force, suitable for breaking resistant materials and tackling more demanding demolitions.
1500W motor
Corded power allows you to work without depending on battery life, an important feature when demolition sessions become long.
Up to 2040 strokes per minute
The percussion frequency is designed to match the high energy of the single blow and ensure effective material removal.
Professional SDS-Max attachment
It allows the use of robust chisels specifically for heavy-duty work, with quick accessory replacement.
10kg class: more mass where it's needed
When demolishing floors, screeds and horizontal structures, the weight of the machine contributes to the penetration capacity of the chisel.
Chisel adjustable in 12 positions
You can adapt the angle of the accessory to the type of work being done, improving your working position and control.
Inline design
The structure is developed to maintain good force transmission on the chisel and facilitate control of the machine during demolition.
Made in Italy
An interesting feature for those looking for a professional DeWalt tool made in Italy and designed for demanding jobs.
What jobs can you tackle?
- Demolition of screeds
- Flooring Removal
- Demolition of cement and concrete
- Masonry breakage
- Openings and demolitions during renovations
- Removal of resistant materials
- Professional demolitions downwards
- Construction work where a 5 kg demolition hammer is undersized
When it's NOT the right choice
- If you mainly need to remove tiles or light plaster
- If you have to make a lot of tracks on the wall
- If you frequently have to work overhead
- If you are looking for a compact and very easy to handle machine
- If you also need to drill holes in concrete
- If you need the freedom of a cordless machine above all else
The D25899K-QS is a pure demolition hammer: it's designed for chiselling and demolition. If you also need to use SDS-Max bits to make holes, you need a rotary hammer.
DeWalt D25899K-QS vs. Bosch GSH 18V-5: Which One Should You Choose?
The comparison between DeWalt D25899K-QS and Bosch Professional GSH 18V-5 is very useful because it compares two completely different ways of tackling demolition.
The DeWalt is a corded machine in the 10 kg class: it focuses above all on impact energy and demolition capacity .
The Bosch GSH 18V-5 is a much lighter professional 18V Brushless BITURBO SDS-Max demolition hammer, developed to offer freedom from the cable, good power and maximum versatility in different working positions.
| Characteristic | DeWalt D25899K-QS | Bosch GSH 18V-5 |
|---|
| Typology | Heavy duty demolition hammer | Compact demolition hammer |
| Diet | Flush | 18V battery |
| Motor | 1500 W | Brushless BITURBO |
| Shot energy | 17.9 J | 8.5 J |
| Number of shots | Up to 2040/min | 3050/min |
| Attack | SDS-Max | SDS-Max |
| Weight | Approximately 9.9 kg | 5.3 kg without battery |
| Freedom from the cable | ❌ No | ✔️ Yes |
| Chisel adjustment | 12 positions | Vario-Lock |
| Electronic control | Traditional setting | Soft Start / Adaptive Speed Control |
| Work down | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ |
| Wall work | ⭐⭐ | ⭐⭐⭐⭐⭐ |
| Ideal for | Heavy demolition, screeds and floors | Traces, tiles, openings and demolitions on the move |
👉 In summary: choose the DeWalt D25899K-QS if you have to deal mainly with demanding demolition work on floors, screeds and concrete and want to make the most of the 17.9 Joules and the mass of the machine.
Instead, choose the Bosch Professional GSH 18V-5 if you mainly need to chisel, make marks, remove tiles or work on walls and want a much lighter and completely cordless machine.
Nicolò 's usage tips and suggestions
On a demolition hammer weighing almost 10 kg and approximately 18 Joules, you need to completely change your approach compared to a 5 kg SDS-Max machine.
Here you don't have to try to push the hammer with all your strength: especially when working downwards, the weight of the machine and the percussion already do most of the work .
Let the 10kg do the work
On screeds and floors there is no need to continuously press the machine.
Keep it steady, control the direction of the chisel, and let the impact do the work. Pushing too hard increases fatigue and doesn't necessarily mean faster demolition.
Choose your chisel carefully
- Pointed chisel: for breaking concrete and very compact materials
- Flat chisel: to widen the demolition and remove material
- Wide chisel: for flooring, cladding and materials to be removed
On a machine with this kind of impact energy, using a suitable chisel in good condition makes a huge difference.
Use the 12 positions of the chisel
Do not always keep the accessory in the same position.
Correctly orienting the chisel allows you to work at a more natural angle and, above all, to better exploit the machine's power.
It is in its ideal environment on the floors
This is where in my opinion the D25899K-QS really makes the difference compared to a lighter demolition hammer.
The weight of almost 10 kg and the 17.9 J help a lot in the demolition of screeds, floors and resistant materials .
On the wall everything changes
The power remains enormous, but you have to support almost 10 kg.
For occasional opening it may be fine, but if you have to spend hours making tracks or removing vertical siding I would choose a lighter machine.
Don't use more power than you need
You don't necessarily need 17.9 Joules to remove a tile.
A machine that's too heavy can cause you to lose precision and risk damaging more material than necessary. This DeWalt should be chosen when the job really justifies its power.
DeWalt or Bosch GSH 18V-5?
For me they are two machines that can even coexist on the same construction site.
I would use the DeWalt for heavy-duty work downwards and the Bosch GSH 18V-5 for more agile work, on walls and where I don't want to have an extension cord behind me.
My final advice
The D25899K-QS makes sense if you actually need to do demolition .
If you work on concrete, screeds and flooring and want to move up a category from the classic 5 kg SDS-Max, here the difference is felt.
👉 In practice: less versatility than a light demolition hammer, but much more capacity when the work gets heavy.
Questions & Answers about the DeWalt D25899K-QS Demolition Hammer
How many Joules does the DeWalt D25899K-QS have?
It develops up to 17.9 Joules of impact energy , a significant power for a 10 kg class SDS-Max demolition hammer.
How much does it weigh?
The machine weighs approximately 9.9 kg . It is therefore designed primarily for large-scale demolition and low-level work.
What attack does it use?
It uses the professional SDS-Max attachment, compatible with chisels dedicated to the most demanding jobs.
Can I use it to demolish a screed?
Yes. Screeds and flooring are precisely among the applications where weight and high impact energy are particularly advantageous.
Is it suitable for making wall tracks?
It can do it, but for prolonged wall work, the 10 kg or so becomes a challenge. For many jobs, a lighter demolition hammer is generally more convenient.
Can I also use it for drilling?
No. It's a demolition hammer designed for chiselling. To use SDS-Max bits and drill into concrete, you need a demolition hammer.
Is it more powerful than the Bosch GSH 18V-5?
In terms of impact energy, yes: the DeWalt develops 17.9 J versus the 8.5 J of the Bosch. However, the GSH 18V-5 is much lighter and cordless, making it more suitable for mobile and wall-mounted jobs.
When is it better to choose Bosch over DeWalt?
If you mainly need to do marking, remove tiles, chisel walls or work in areas without electricity , the Bosch is more practical thanks to its lower weight and 18V power supply.
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