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Automated cat litter box · Used price guide
Resale index · Jul 2025 = 100
This model is appreciating — demand is outpacing supply. Waiting for prices to fall is unlikely to pay off.
Bench test
Not yet bench-tested by Robot AutoTrader. Resale values are drawn from verified sale data.
A used Litter Robot 4 in good condition with all accessories (waste drawer liners, carbon filter) should be priced at £350 to £490. The Litter Robot 4 retails at £649 new in the UK; the used saving reflects steady but not explosive depreciation in a category with strong brand loyalty and no serious competitor.
The Litter Robot 4 adds OmniSense presence detection (weight-based plus optical sensors), quieter motor, USB-C connectivity and an improved app with health tracking. The Litter Robot 3 is still a good purchase at £180–£280 used — if the mechanism works reliably, the core experience is similar. Buy the 4 if health tracking or app integration matters to you.
Litter Robot units routinely last 5–8 years with standard maintenance. The motor and globe mechanism are the components most likely to need replacement; Whisker sells all spare parts including the motor kit (around £60). A well-maintained used Litter Robot 4 at £400 has many years of service life remaining.
See current Litter Robot 4 listings
Every listing shows measured battery health, owner count, and a price benchmarked against this index.