If it is just normal bricked wall, the hammer drill will do. It will take  a bit more effort. Just need to buy long drill bit. However, it is not a small diameter 

When I did not own a rotary hammer last time, I only managed to find long drill bit (10mm I guess) but it was an SDS type. Hammer drill normally use traditional chuck. So, I have to cut a bit the chuck end so that the chuck can grip properly on the round part 

I used it for quite a while and drilled many holes with it. Now I have a hammer drill but have yet to do anything drilling like that yet 

BTW... my hammer drill was a 750W

I think the challenge is to get a 22mm bit in round shank (mostly this size 20mm+ will be SDS+) as impact drills won't be able to effectively drill >13mm dia.

22mm hole + 20cm depth sounds like you will need the masonry bit  [https://shopee.com.my/BOSCH-SDS-Plus-5X-Masonry-Hammer-Drill-Bit-(22mm-x-200mm-x-250mm)-2608836644-i.1057873.1560631522] rather than core cutter as it's pretty deep. Best used with SDS+ rotary hammer.

If it's just one-off usage don't need to buy, just rent the rotary hammer (min 1 week) - https://www.12rent.my/pd-rental-bosch-gbh-2...s-plus-790w.cfm

For me I bought a rotary hammer (2-24 bosch) coz I stay in a place which has lots of RC concrete walls, normal drill would take too long to drill whereas a rotary hammer cuts through within 1-2 seconds for 6mm hole.

1) If you want to do one time, then why not just get a contractor to do it for less than a hundred.

2) if you want to have one handy around the house, no need to get the cordless one.

3) If cordless a must but semi-pro, I'd not go for Bosch. Only 6 month warranty for pro version? I'd rather go for semi-pro Stanley Stanley with 2 years warranty like

https://shopee.com.my/STANLEY-SBR20M2K-18V-...0870.2463142657

P.S. No offense to Bosch fan