BWT Cosmy 150 Robotic Pool Cleaner - Pools up to 10m
BWT Cosmy 150 Robotic Pool Cleaner - Pools up to 10m is temporarily out of stock and will ship as soon as it's available.
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BWT Cosmy 150 Robotic Pool Cleaner - Pools up to 10m is temporarily out of stock and will ship as soon as it's available.
BWT Cosmy 150 Robotic Pool Cleaner – Floor, Wall & Waterline
The BWT Cosmy 150 robotic pool cleaner is a compact, lightweight automatic pool cleaner designed for residential swimming pools up to 10 metres long.
Unlike basic floor-only robotic cleaners, the Cosmy 150 cleans the pool floor, walls and waterline during its automatic 2-hour cleaning cycle.
It combines BWT's AquaSmart navigation system, integrated gyroscope, dual-drive platform and powerful 15m³/h filtration pump to provide controlled and efficient cleaning throughout the pool.
At only 5.75kg, the Cosmy 150 is also considerably easier to lift, carry and store than many traditional robotic pool cleaners.
Why Choose the BWT Cosmy 150?
- Suitable for pools up to 10m long
- Cleans the floor, walls and waterline
- 2-hour automatic cleaning cycle
- 15m³/h filtration pump flow
- BWT AquaSmart intelligent navigation
- Integrated gyroscope
- Dual-drive robotic platform
- Two-stage planetary gear drive system
- Top-access filter basket
- 16m floating cable
- Lightweight 5.75kg construction
- Low power consumption of less than 150W
- Compatible with an external timer
- 2-year manufacturer's warranty
BWT AquaSmart Navigation
The Cosmy 150 uses BWT's AquaSmart navigation algorithm to manage how the cleaner travels through the swimming pool.
An integrated gyroscope provides additional movement information, allowing the robot to control its cleaning path rather than relying solely on uncontrolled or random direction changes.
The Cosmy 150 also incorporates an escape algorithm designed to assist the robot when it encounters difficult areas of the pool.
Cleans the Floor, Walls & Waterline
The Cosmy 150 provides substantially more complete cleaning than a floor-only robotic cleaner.
During its cleaning program, the robot is designed to:
- Vacuum and brush the pool floor
- Climb and clean the pool walls
- Clean along the waterline
This makes the Cosmy 150 particularly well suited to pool owners wanting a relatively simple robotic cleaner without moving to a larger or more complicated premium model.
15m³/h Filtration Performance
Despite its compact size, the Cosmy 150 has a rated filtration pump flow of 15 cubic metres per hour.
Water and debris are drawn through the robot as it travels around the pool, with collected material retained inside the removable filter basket.
This independent filtration means the Cosmy operates separately from the swimming pool's skimmer box, suction cleaner connection and main filtration system.
Easy Top-Access Filter Basket
The Cosmy 150 uses a single top-access filter basket. Once the robot has been removed from the pool, the basket can be accessed from above for emptying and rinsing.
There is no need to turn the cleaner upside down to access its primary filter.
Two-Stage Planetary Gear Drive
A distinctive feature of the BWT Cosmy range is its two-stage planetary gear drive system.
The compact drive system works with the robot's dual-drive platform to provide precise movement while reducing the size and weight normally associated with more conventional robotic cleaner drive systems.
BWT combines this drive system with separate navigation software and a powerful filtration pump rather than relying simply on suction to move the cleaner around the pool.
Dual-Drive Manoeuvrability
The Cosmy 150 uses BWT's Noya dual-drive platform. Independent drive control assists the robot with turning, changing direction and navigating different sections of the swimming pool.
This is particularly important when transitioning between the floor and walls and when the robot needs to change its cleaning direction.
Lightweight 5.75kg Design
Robotic cleaners spend most of their working life underwater, but their weight becomes important every time they need to be removed from the pool.
The BWT Cosmy 150 weighs approximately 5.75kg, making it relatively easy to:
- Lift from the swimming pool
- Carry to and from storage
- Empty and clean
- Handle without a large transport caddy
16 Metre Floating Cable
A 16m floating cable connects the Cosmy 150 to its low-voltage power supply and provides sufficient operating range for swimming pools up to the manufacturer's specified 10m maximum length.
The cleaner also incorporates anti-tangling software to assist with cable management while operating.
Energy Efficient Operation
The Cosmy 150 operates from a low-voltage 29V DC Venus power supply and consumes less than 150 watts during operation.
The supplied power supply accepts a 100-240V, 50/60Hz mains input, with the Australian version supplied for local electrical requirements.
BWT Cosmy 150 Specifications
| Brand | BWT |
| Model | Cosmy 150 / COSMY the Bot 150 |
| Product Number | BOT150 |
| BWT Reference | 125505480 |
| Maximum Pool Length | 10m |
| Maximum Pool Depth | 4m |
| Cleaning Area | Floor, walls & waterline |
| Cleaning Cycle | 2 hours |
| Pump Flow | 15m³/h |
| Navigation | BWT AquaSmart |
| Gyroscope | Yes |
| Drive System | Noya dual drive |
| Escape Algorithm | Yes |
| Anti-Tangling Software | Yes |
| Brush | PVC front brush |
| Filter | Top-access single filter basket |
| Cable Length | 16m floating cable |
| Power Supply | BWT Venus |
| Robot Supply Voltage | 29V DC |
| Power Consumption | Less than 150W |
| App Control | No |
| External Timer Compatible | Yes |
| Robot Weight | 5.75kg |
| Warranty | 2 years |
Suitable Pool Types
BWT specifies the Cosmy 150 for pools up to 10 metres long and states that it is compatible with different pool shapes and construction materials.
Actual wall-climbing and waterline performance can vary with pool geometry, surface condition, water chemistry and features such as steps, ledges, beach entries and unusual wall transitions.
What Comes With the BWT Cosmy 150?
- BWT Cosmy 150 robotic pool cleaner
- 16m floating cleaner cable
- BWT Venus power supply and mains power cord
- Top-access filter basket
- Owner's manual
Transport caddy: BWT's current Cosmy 150 technical specification does not list a caddy as standard equipment.
Using the Cosmy 150
- Position the power supply safely away from the pool according to the manufacturer's instructions.
- Connect the cleaner cable to the power supply.
- Place the Cosmy 150 into the pool and allow trapped air to escape.
- Allow the robot to settle onto the pool floor.
- Start the cleaning cycle from the power supply.
- Allow the cleaner to complete its automatic 2-hour cycle.
- Switch the power supply off before removing the cleaner.
- Remove and rinse the filter basket after cleaning.
Maintenance
Regular basic maintenance helps maintain cleaning performance and extends the service life of the cleaner.
- Empty and rinse the filter basket regularly
- Check the brush and tracks for trapped debris
- Inspect the floating cable for damage or excessive twisting
- Do not pull the robot from the pool using the electrical cable
- Rinse accumulated pool chemicals from the cleaner where appropriate
- Store the robot out of prolonged direct sunlight when not being used
- Follow BWT's instructions regarding removal from the pool between cleaning cycles
Frequently Asked Questions
What size swimming pool will the BWT Cosmy 150 clean?
BWT specifies the Cosmy 150 for residential pools up to 10 metres long and up to 4 metres deep.
Does the Cosmy 150 clean pool walls?
Yes. The Cosmy 150 is designed for floor, wall and waterline cleaning.
Does the Cosmy 150 clean the waterline?
Yes. Waterline cleaning is included as part of its standard cleaning program.
How long is the Cosmy 150 cleaning cycle?
The current BWT technical specification lists a 2-hour cleaning cycle.
Does the Cosmy 150 connect to the pool pump?
No. It is a self-contained electric robotic pool cleaner with its own drive motors, filtration pump and filter basket.
Does it require a suction cleaner connection?
No. It does not connect to the pool skimmer box or suction line.
How much water does the Cosmy 150 pump?
BWT rates the cleaner's pump flow at 15m³/h.
Does the Cosmy 150 have a gyroscope?
Yes. It uses an integrated gyroscope together with BWT AquaSmart navigation.
Does the Cosmy 150 have Wi-Fi or Bluetooth app control?
No. The current Cosmy 150 specification does not include app connectivity.
Can the Cosmy 150 be used with an external timer?
Yes. BWT's current technical data lists the Cosmy 150 as external-timer compatible.
What type of filter does it use?
The current model uses a removable top-access single filter basket.
How heavy is the Cosmy 150?
The robot weighs approximately 5.75kg.
How long is the cable?
The Cosmy 150 has a 16 metre floating cable.
Does it come with a caddy?
A caddy is not listed as standard equipment in BWT's current Cosmy 150 technical data.
What warranty does the BWT Cosmy 150 have?
The Cosmy 150 carries a 2-year manufacturer's warranty.
Before Ordering
The Cosmy 150 is intended for pools up to 10 metres long. Very unusual pool shapes, large beach entries, shelves, steps or unusual wall transitions can affect the behaviour of any robotic pool cleaner.
If replacing an existing cleaner or choosing between BWT models, compare the pool length, required cleaning area, cable length and navigation features rather than selecting solely on pump flow.
To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.
This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.
Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.
Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems and other plumbing areas so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate.
Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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