Head to head
Atlas Copco QAS 20 vs Pramac GRW22Y/S5
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kva prime power. The Pramac GRW22Y/S5 is a stage v rental generator set, 18.3 kva prime power.
Last reviewed 6 October 2026
Specifications side by side
| Atlas Copco QAS 20 | Pramac GRW22Y/S5 | |
|---|---|---|
| Prime power PRP | 17,5 / 14 (kVA / kW) | 18.3 kVA |
| Emergency standby power ESP | 18,7 / 15 (kVA / kW) | 19.3 kVA |
| Fuel tank | 115 litres | - |
| Noise level | 60 (LpA at 7m, dB(A)) | - |
| Weight | 696 / 795 (dry / wet, kg) | - |
| Voltage | - | 400/230 (V) |
| Engine | - | YANMAR |
| Emission stage | - | Stage V |
Sources: Atlas Copco QAS 20, Pramac GRW22Y/S5. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the QAS 20 if...
A small 50Hz site generator for powering tools, welfare cabins and small sites, in the Atlas Copco QAS range that the maker designs for rental use. Its Kubota engine and 60 dB(A) sound pressure level at 7m suit work in built-up areas.
Full QAS 20 specifications →Buy or hire the GRW22Y/S5 if...
Rental-series generator set for hire fleets, events, construction sites and city centre works needing temporary three-phase power.
Full GRW22Y/S5 specifications →Common questions
What is the difference between the Atlas Copco QAS 20 and the Pramac GRW22Y/S5?
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kVA prime power; the Pramac GRW22Y/S5 is a stage V rental generator set, 18.3 kVA prime power.
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