Frequently Asked Questions
What is a water tank on a robot vacuum?
It’s a detachable plastic container that holds clean water and releases it onto a mopping pad as the robot cleans your floors.
How does the water tank keep the mopping pad damp?
A small pump or gravity allows a tiny drip of water to flow from the tank onto the mopping pad, keeping it consistently damp like a wrung-out sponge without leaving puddles.
What is the advantage of a water tank over manually wetting the mopping pad?
With a water tank, the pad stays damp for the whole cleaning run and you can adjust wetness, whereas manually wetting dries out quickly and gives uneven mopping.
Do I need a robot vacuum with a water tank?
Only if you want mopping functionality—it’s ideal for hard floors like tile or hardwood, but unnecessary if your home is all carpet.
The bottom line
A water tank turns a robot vacuum into a robot vacuum AND mop — two chores done in one pass. If you have hard floors and want to save time, a robot with a refillable water tank is a no-brainer. Just remember to empty and rinse the tank every few uses to keep it from getting slimy. For the price of a few coffee shop visits, you can get a model that does the mopping for you. Your knees will thank you.