Is Ecovacs or Xiaomi better for a used robot vacuum in the UK?

Ecovacs delivers more capable hardware at a higher used price; Xiaomi delivers strong value at a lower price. The Deebot T30S Combo's dual spinning mop system, 3D obstacle avoidance, and full auto-clean dock are meaningfully better. If those features matter and your budget allows £400+, Ecovacs wins. Below £300, the Xiaomi S20 Pro is the right choice.

Do Ecovacs robot vacuums hold value well?

The Deebot T30S Combo is down 5.9% year on year on the Robot Resale Index — moderate depreciation consistent with the broader domestic robot category. This is a normal and healthy level of depreciation that creates a genuine buying window at 40–55% off retail without the model being so old that support is becoming a concern.

What is the Xiaomi Mijia account issue with used robot vacuums?

Xiaomi robot vacuums are paired to a Xiaomi Mijia account that is device-linked. A previous owner who does not fully unlink the device before selling creates a situation where the new owner cannot pair the robot to their own account without a factory reset. Always ask the seller to factory reset the unit during your viewing, confirm you can pair it to your own account, and verify the Xiaomi Home app shows no existing account link before completing the purchase.

Robot vacuum & mop comparison

Ecovacs Deebot T30S Combo vs Xiaomi Robot Vacuum S20 Pro — Which to Buy Used?

Last updated 7 September 2026

The Ecovacs Deebot T30S Combo and the Xiaomi Robot Vacuum S20 Pro are the two fastest-rising robot vacuum brands in the UK used market — both up 20% in search interest year on year. They compete at different price points: the Deebot T30S Combo sits at £380–£530 used versus £240–£360 for the Xiaomi S20 Pro. The question is whether the Ecovacs' more capable mop system and obstacle avoidance justify the £140–£170 price premium.

Robot vacuum & mop

Ecovacs Deebot T30S Combo

Recommended

Used price (UK)£380–£530

Retail (new)£849

Resale index94.1(-5.9% YoY)

Full price guide →

Robot vacuum & mop

Xiaomi Robot Vacuum S20 Pro

Used price (UK)£240–£360

Retail (new)£599

Resale index92.4(-7.6% YoY)

Full price guide →

How they compare

Aspect	Ecovacs Deebot T30S Combo	Xiaomi Robot Vacuum S20 Pro
Used price (UK)	£380–£530	£240–£360✓
Retail price (new)	£849	£599✓
Suction	11,000 Pa✓	10,000 Pa
Mop system	OZMO Turbo 2.0 — dual spinning mop pads✓	Single oscillating mop pad
Obstacle avoidance	AIVI 3D — structured light + AI✓	LiDAR + basic camera
Dock	Auto-empty, auto-wash, auto-refill✓	Auto-empty only
App	Ecovacs Home — full featured, English	Xiaomi Home / Mi Home — full featured, English
Account transfer	Straightforward factory reset✓	Requires Mijia account unlink — check carefully
Best for	Hard floors, mixed floors, active mopping	Budget buyers, mainly carpets or light mopping

Which should you buy?

★ Choose Ecovacs Deebot T30S Combo

Choose the Ecovacs Deebot T30S Combo if you have significant hard floor area that needs regular mopping, a more complex room layout that benefits from 3D obstacle avoidance, or you want a full auto-clean dock. The dual spinning mop pads genuinely outperform single-pad systems on tile and hardwood. Budget £420–£480 for a good used unit.

Choose Xiaomi Robot Vacuum S20 Pro

Choose the Xiaomi S20 Pro if your primary need is vacuuming, your home has mainly carpet, or your budget is under £300. The S20 Pro is excellent value at £240–£300 used and offers flagship-tier suction performance at a fraction of the full-dock Ecovacs price. Verify the Mijia account reset carefully before buying.

Bottom line

The Ecovacs Deebot T30S Combo is the better machine in almost every measurable dimension. At £420–£480 used it is the stronger buy if your home has hard floors and you want proper mopping. The Xiaomi S20 Pro at £260–£320 is a compelling budget choice for buyers who primarily vacuum and want Xiaomi's ecosystem integration.