Is the Roborock S8 Pro Ultra really worth four times the price of the Eufy X8 used?

For the right household, yes. The RockDock system alone — which self-empties the dustbin, washes the mop heads, dries them, and refills the water tank — adds over £300 of functionality versus the X8's basic charging dock. Add the mopping capability, better carpet suction, and 9.1/10 versus 7.6/10 bench score, and the S8 Pro Ultra is a materially different product. But if you have no hard floors that need mopping and a tight budget, the X8 at £160 does the job.

Can the Eufy RoboVac X8 replace a manual vacuum on hard floors?

Yes, for daily maintenance. Our bench test showed the X8's twin-turbine suction delivering effective debris pickup on hard floors in the 7.5/10 range. It will not replace a deep clean with a cylinder vacuum, but it reduces the frequency of manual vacuuming on hard floors to once a week or less in typical households.

Which uses less electricity — Roborock S8 Pro Ultra or Eufy RoboVac X8?

The Eufy X8, significantly. The RockDock on the S8 Pro Ultra consumes power for drying, pumping, and heating functions in addition to charging. For budget-conscious buyers on all hard floors, the X8's lower running cost is a real factor over a two-year ownership horizon.

Robot vacuum comparison

Roborock S8 Pro Ultra vs Eufy RoboVac X8 — Which to Buy Used?

Last updated 25 August 2026

The Roborock S8 Pro Ultra and Eufy RoboVac X8 represent opposite ends of the used robot vacuum market. One costs £580–£720 used and includes a dock that washes its own mop heads. The other costs £140–£200 and has no dock automation at all. This comparison is less about which is 'better' — the S8 Pro Ultra wins on almost every metric — and more about whether the £400+ gap is worth it for your specific home.

Robot vacuum & mop

Roborock S8 Pro Ultra

Recommended

Used price (UK)£580–£720

Retail (new)£1,099

Bench score9.1 / 10

Resale index91.8(-8.2% YoY)

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Robot vacuum

Eufy RoboVac X8

Used price (UK)£140–£200

Retail (new)£319

Bench score7.6 / 10

Resale index88.4(-11.6% YoY)

Full price guide →

How they compare

Aspect	Roborock S8 Pro Ultra	Eufy RoboVac X8
Bench score	9.1 / 10✓	7.6 / 10
Used price (UK)	£580–£720	£140–£200✓
Type	Vacuum + mop✓	Vacuum only
Dock	Full RockDock — self-empty, self-wash, self-refill✓	Basic charging dock only
Navigation	Reactive AI + structured light	Lidar (dToF)
Carpet performance	Excellent — mop auto-lifts✓	Weak on thick pile
Mopping	Active oscillating mop, auto-maintained✓	None
Maintenance frequency	Autonomous — dock handles cleaning✓	Manual filter and brush cleaning weekly
Best for	Any floor type, households wanting full automation	Hard floors only, budget buyers

Which should you buy?

★ Choose Roborock S8 Pro Ultra

Choose the Roborock S8 Pro Ultra if your home has hard floors that benefit from mopping, you have mixed carpet and hard floor, and you want a machine that genuinely requires minimal intervention. At £650 used versus £1,099 new, it is still a strong buy.

Choose Eufy RoboVac X8

Choose the Eufy RoboVac X8 if your home is entirely hard floor, you do not need mopping, you have no pets, and your budget ceiling is £200. At £150–£175 it is the best value lidar-navigation robot vacuum available in the UK used market.

Bottom line

These two robots serve completely different buyers. If you are comparing them to decide which to buy, the deciding factor is budget and floor type. Under £200 and all hard floors: Eufy X8. Over £500 and any carpet or mopping requirement: Roborock S8 Pro Ultra.

For sale now

Roborock S8 Pro Ultra

£580–£720 used

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Eufy RoboVac X8

£140–£200 used