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What do you need it for?
They're generally measured in Joules and kg. A light weight one is around 2kg and something like 1.5-2.5J.
That will drill holes in concrete with ease.
If you really need to smash shit up for long periods of time then you'll want something bigger.
If money isn't much of a consideration then a light cordless one is great. I'm not sure I see the point in beefy cordless ones as if you need a hug SDS then you'll probably be using it for longer periods of time so have to swap batteries out.
I'm happy with this Bosch Blue one which came with a case: https://www.screwfix.com/p/bosch-gbh-2-21-2-3kg-electric-corded-sds-hammer-240v/319ky
My cordless stuff is Dewalt and all their cordless SDS are pretty pricy so that ruled them out. The Bosch has a metal gearbox and replaceable brushes, plus all the hammer and chisel functions. So on balance it seemed like the right balance of price, power and quality for me. In terms of my planned* use; remove some tiles, a bit of chasing drilling lots of holes in concrete, and general diy hole drilling.
*I've only actual drilled concrete and general holes in brick.
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hugo7
Drill people. There has been SDS chat but I don’t remember SDS recommendations, just drill recos. Apologies if my searching has failed me. I just killed an ancient 850w cabled SDS drill. Is 2200w ~3x as powerful? What brands? Is there a particularly good cheap and cheerful one? Grazie x