
Yep, the iRobot Roomba S9 can handle cleaning multiple floors in your home. You don't need a separate Clean Base for each floor either.
According to our research, all you need to do is carry the Roomba to the different levels and set it up to clean there. Just make sure it has access to its dock on each floor for recharging. It might need to do a new mapping for optimal cleaning on each level, though.
From what we found, the Roomba S9 can remember multiple floor plans, which is great for homes with several stories. Sometimes it might need to remap the area when you move it to a different floor to get everything cleaned right, but once it's mapped, it should work without any issues.
Its powerful suction and other advanced features make it pretty effective for multi-floor homes, even though you'll spend a bit of time setting it up for each new floor. If you don't want to keep moving the dock around, you could buy an extra one for another floor, but it’s not a must.
So, if you have a home with multiple floors, the Roomba S9 is a good fit. It’s strong and adaptable, making it easier to keep your entire place clean.
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If the iRobot Roomba S9 (9150) doesn't quite fit your needs, here are some other options to consider:

The Roborock S8+ boasts an advanced dual-sensor navigation system, merging LIDAR and 3D scanning cameras for accurate mapping and effective obstacle avoidance. It also features an ultrasonic mopping system that tackles tough stains, making it a powerful and multifunctional option over the iRobot Roomba S9.

Looking for a budget-friendly option? The Dreametech DreameBot D10 Plus offers self-emptying capabilities and built-in mopping at a competitive price. It navigates various surfaces effectively, providing solid performance without the premium cost associated with the Roomba S9.

The iRobot Roomba j7+ features advanced AI technology for real-time hazard avoidance, making it an excellent option for families with pets. While it may not have the suction power of the S9, it excels with its automation features and the peace of mind it offers when cleaning around obstacles.

The Roborock Q5+ is a great pick for those looking for efficient cleaning at a lower cost. It features self-emptying capabilities and a user-friendly app for controlling cleaning sessions. While it may lack some of the high-end features of the S9, it still offers effective coverage and ease of use.

The Wyze Robot Vacuum features LIDAR navigation that performs well in low-light situations, offering better coverage than the Roomba S9 in similar environments. It provides a strong balance of features and performance at a more affordable price, making it a reliable choice for various household needs.