Quick answer: which HOBOT should you investigate first?
Start with 298 when you want a square HOBOT with one spray tank, or 2S when its dual-spray square workflow is relevant. Start with 388 only when a round rotating-pad robot suits framed glass and its smaller published pane threshold matters. None is an automatic winner: reject any model whose exact manual does not approve the pane, edge, surface, power route, tether anchor, or retrieval plan.
HOBOT 298, 388, and 2S evidence comparison
Every figure below is a manufacturer-published specification, not our measurement. Use it to decide what to verify in the exact regional manual and current offer.
| Model | Body and travel | Spray system | Published window evidence | Controls | Who should investigate it | Do not infer |
|---|---|---|---|---|---|---|
| HOBOT 298 | Square; linear Z-shaped movement | Single ultrasonic nozzle; removable 40 ml tank | Manufacturer lists more than 40 × 40 cm and marks framed and frameless use | App and remote | Investigate when a square, linear-route HOBOT and a single replaceable tank fit the job. | The published frameless mark is not approval for every open edge, gap, coating, pane, or installation. |
| HOBOT 388 | Round; two inter-rotating cleaning wheels | Single ultrasonic nozzle; removable 24 ml tank | Manufacturer lists more than 35 × 35 cm; current comparison marks frameless use unsupported | App and remote | Investigate when the round rotating-pad workflow and smaller published pane threshold fit framed glass. | This site has no approved 388 catalog record, product image, ASIN, or Amazon destination. Do not treat pressure sensing as frameless approval. |
| HOBOT 2S | Square; linear zigzag and N-way movement | Dual ultrasonic nozzles; two removable 26 ml tanks | Manufacturer lists more than 40 × 40 cm and marks framed and frameless use | App, remote, and listed firmware updating | Investigate when dual spray and the newer square-route control set are useful after compatibility clears. | Dual spray does not prove a better finish, faster work, or safer fit on a particular window. |
Choose by chassis and movement
The 298 and 2S use square bodies and linear routes. That does not make them interchangeable: their spray hardware, edge-sensor listings, software labels, and update support differ in the current comparison. The 388 uses two round microfiber-covered cleaning wheels that both wipe and move the robot. Its rotating workflow changes pad preparation and inspection, so 298 or 2S directions should not be transferred to it.
Choose by spray workflow
HOBOT documents one replaceable ultrasonic spray tank on 298, one on 388, and two on 2S. More nozzles are not evidence of a better finish. Cloth condition, soil load, approved fluid, spray direction, pass sequence, humidity, and exact instructions all affect the job. The 388 instructions specifically say to fill only with water or HOBOT window detergent and not above the maximum mark; do not universalize that wording to another model without its manual.
Treat edge support as a hard exclusion
The current HOBOT USA comparison marks 298 and 2S for frameless glass and marks 388 unsupported. That is a screening difference, not a safety guarantee. Before placing any robot near an open edge, confirm the exact manual names the model, region, pane dimensions, edge condition, starting clearance, cable setup, tether anchor, and retrieval method. If any required condition is unknown, use a supported framed pane or another cleaning method.
Power backup is not cordless runtime
All three sources describe a secured power connection plus an embedded UPS intended to hold and alert after power loss. HOBOT’s 388 instructions require the robot to remain connected to an electrical outlet while operating. Keep the safety rope fixed to an appropriate indoor anchor, protect the area below, stay present, and retrieve the robot promptly after a power alert. Never plan a normal cleaning session around the backup-hold figure.
A five-step confirmation sequence
- Match the identity. Confirm 298, 388, or 2S on the unit, offer, and regional manual.
- Measure the usable pane. Exclude frames, handles, bevels, seals, gaps, and obstacles from the turning and travel area.
- Resolve the edge. Treat missing or conflicting frameless approval as a stop, not a soft preference.
- Plan the complete safety system. Inspect power connections, safety rope, anchor, exclusion zone, supervision, and reachable retrieval.
- Confirm upkeep and support. Match pads, tanks, nozzles, approved fluid, instructions, and replacement parts to the exact model before buying.
Questions readers ask
What is the main difference between HOBOT 298, 388, and 2S?
The 298 and 2S are square robots that follow linear routes; the 388 is round and moves by rotating two cleaning wheels. The 298 and 388 have one ultrasonic spray nozzle, while the 2S has two. Exact edge support also differs, so shape and model name cannot substitute for the matching manual.
Is HOBOT 388 for frameless windows?
Do not treat it as a frameless choice. HOBOT USA’s current comparison marks frameless glass unsupported for 388, and HOBOT’s exact specification describes a central pressure sensor rather than granting blanket open-edge use. Follow the exact regional manual and stop if the pane or edge condition is not explicitly supported.
Is HOBOT 2S better than HOBOT 298?
Not universally. HOBOT documents dual spray and firmware updating for 2S, while 298 has a single removable tank and its own square linear workflow. Those differences do not prove cleaning finish, durability, value, or fit. Choose only after the exact pane, edge, reach, cable, tether, and retrieval checks pass.
Can any of these HOBOT robots run cordlessly?
No cordless cleaning claim is made here. The exact HOBOT instructions reviewed require connection to electrical power during operation; the embedded backup supply is described as emergency holding time, not ordinary cordless runtime. Keep the secured power connection, safety rope, supervision, and retrieval plan required by the manual.
Sources and evidence limits
- HOBOT USA: model comparison for 298, 2S, and 388
- HOBOT USA: HOBOT 298 product page
- HOBOT USA: HOBOT 2S product page
- HOBOT Technology: HOBOT 388 product page
- HOBOT Technology: HOBOT 388 operating instructions
- HOBOT Technology: HOBOT 388 exact specification
A People Also Ask block was present in the fresh US results for the HOBOT brand query, but its question text was not returned. The FAQs above are editorial questions derived from the model evidence; they are not claimed Google PAA questions.
