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Robot vacuum & mop · Used price guide
Resale index · Jul 2025 = 100
Down 7.6% year on year. Best buying window: August.
Bench test
Not yet bench-tested by Robot AutoTrader. Resale values are drawn from verified sale data.
A used Xiaomi S20 Pro with clean dock, battery health above 80%, and under 18 months old should be priced at £240 to £360. The S20 Pro retails at £599 new; the 40–60% used saving reflects Xiaomi's rapid product cycle — the brand releases updated models every 12–18 months, pushing previous flagships sharply into the used market.
Yes, with one important check: confirm the Xiaomi Mijia account has been fully unlinked by the seller and factory-reset the unit before pairing to your own account. Xiaomi products use device-linked accounts that can prevent a new owner from adding the robot to their own app without a proper reset. Other than this, Xiaomi robot vacuums are reliable and well-supported in the UK.
The Ecovacs T30S Combo is the stronger machine — better obstacle avoidance, a superior mop system, and a full auto-clean dock. The Xiaomi S20 Pro is £100–£150 cheaper used and offers better value per pound for budget-conscious buyers. If you primarily need vacuuming on hard floors and basic mopping, the S20 Pro delivers at a price the T30S Combo cannot match.
See current Xiaomi Robot Vacuum S20 Pro listings
Every listing shows measured battery health, owner count, and a price benchmarked against this index.