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Robot vacuum & mop · Used price guide
The highest bench-test score in Robot AutoTrader's library. The full RockDock system — self-washing, self-emptying, self-refilling — is a significant part of the product's value. Used units at £580–£720 with the dock represent the strongest value proposition in the entire robot vacuum and mop category.
Resale index · Jul 2025 = 100
Down 8.2% year on year. Best buying window: September.
£580 to £720 for a unit with the full RockDock, battery health above 85%, and under two years old. Units without the RockDock should be priced below £400 — the dock accounts for around a third of the product's practical value.
The Robot AutoTrader Resale Index shows it at 91.8 — down 8.2% year on year. At £650 used versus £1,099 new, the discount is around 40%, which is strong value for what is still the top-scoring robot vacuum in our bench test library.
Yes — the 9.1/10 bench test score after six months of daily use confirms the dock functions and performance hold up. The key is getting the full RockDock system; without it you are buying a capable vacuum and mop that requires manual emptying, which defeats much of the product's proposition.
See current Roborock S8 Pro Ultra listings
Every listing shows measured battery health, owner count, and a price benchmarked against this index.