Sooo there are hammer drills and there are hammer drills.
Don't be fooled. If brick walls are what you want to drill through, especially around 20mm thick. You want the SDS drill bits. For the Bosch cordless, this is the Rotary hammer drill.
It seems it is currently this one:
https://www.takealot.com/gbh-185-li-rotary-hammer/PLID95409596
Mine is the 180-li and this looks like a newer version of what I have.
I have personally drilled up to 25mm wide with mine, but since its a cordless, you start smaller then go bigger. If you dont want to do that, you need a corded version with more power.
1.5ah batteries do not work on this drill. You need 4ah and up. They say it works with 3ah too, but I went straight for 6ah batteries. They, with this drill, is amazing. One of my favourite tools.
Do not be fooled, the following drill, is not a proper hammer drill:
https://www.takealot.com/bosch-gsb1...ith-bosch-engineer-s-hammer-300g/PLID94391867
While that thing has a hammer mode, its basically useless for bigger jobs. You can use it on maybe 6mm bits.
That said, its a great drill for anything that doesn't need SDS bits. You will use this everywhere, screwdriver bits, wood drilling, small metal drilling etc. Good all rounder, but not perfect for anything specific. You will want a corded drill if you going to be doing 20mm metal bits. Its great for all sizes wood that I have done.
Then lastly, there is the impact wrench type drill:
https://www.takealot.com/bosch-impact-driver-cordless-wrench-gdx-180-li-18v-unit-only/PLID72190867
This you again will need for something specific. Also, this would be the last drill you buy if you ever buy more than 2.
Hope that helps. You get cheaper and more expensive drills than the ones I listed, but for home diy, the above 3 has served me well depending on what exactly I find myself doing. That rotary hammer is my favourite drill, and it has more than paid for itself over the years that I have used it. From drilling over 100 holes for floating bookrack to drilling 23mm holes for conduit piping to whatever, I used this for concrete drilling and it hasnt skipped a beat and literally made my life easier doing DIY.