STIHL WSA 40 cordless pressurised water container
The STIHL WSA 40 is a 10-litre battery-powered water tank designed to provide an automatic mobile water supply for compatible STIHL cut-off machines during wet cutting.
Instead of requiring repeated hand pumping, its AS 2-powered pump automatically builds and maintains the selected pressure. This makes the WSA 40 particularly useful on construction, landscaping and civil-engineering sites where a live mains-water connection is unavailable or inconvenient.
The set includes the WSA 40 tank, removable pump head, STIHL AS 2 battery, STIHL AL 1 charger, four-metre hose and standard coupling.
STIHL WSA 40 at a glance
- Automatic mobile water supply for compatible cut-off machines
- 10-litre maximum water-fill capacity
- Battery-powered pump head
- STIHL AS System
- AS 2 battery included
- AL 1 standard charger included
- Adjustable operating pressure from approximately 1.5 to 2.5 bar
- Up to approximately 30 minutes of pump operation per charge
- Up to approximately five full tank fills per charge
- Four-metre water hose with standard coupling
- Transparent container with visible level scale
- Funnel-shaped filling opening
- LED battery-charge indicator
- Automatic standby and switch-off functions
- Integrated pressure-relief valve
- Removable pump head
- Soft-grip carrying handle
- IPX4 splashwater protection
- Approximately 3.1kg device weight
- STIHL part number SA090118515
Who is the STIHL WSA 40 suitable for?
The WSA 40 is intended primarily for trade and professional users who carry out wet cutting regularly and cannot always position their work close to a convenient water connection.
It is particularly suitable for:
- Builders and general construction contractors
- Groundworkers and utilities contractors
- Landscapers and paving installers
- Civil-engineering teams
- Road and site-maintenance work
- Cutting concrete, paving, brick and masonry with an approved wet-cutting setup
- Sites without a reliable live water supply
- Users wanting fewer interruptions than a hand-pumped tank requires
Consider the manual tank instead when:
- Your wet-cutting work is infrequent
- Keeping the initial purchase cost as low as possible is the priority
- You do not want to manage or charge a battery
- Stopping periodically to repressurise the container is acceptable
Why Masseys recommends the STIHL WSA 40
At Masseys, we recommend the WSA 40 to trade users who regularly cut paving, concrete, masonry or similar materials away from an accessible water connection.
Its real advantage is not simply the 10-litre capacity. The lower-cost manual STIHL container holds the same quantity of water. The benefit of the WSA 40 is that its electric pump automatically maintains the selected pressure, reducing the need to stop cutting, put the machine down and pump the tank by hand.
The AS 2 battery can provide up to approximately 30 minutes of pump operation, which STIHL equates to roughly five full WSA 40 tank fills under suitable conditions. For most users, that means one charged battery should comfortably outlast the water held in a single tank.
It is also useful that the set is complete. The AS 2 battery and AL 1 charger are included, so a new customer does not have to identify and purchase a separate power package before using the pump.
The main consideration is value. When the tank will only be used a few times each year, the manual STIHL pressurised water container may be the more economical option. For repeated professional use, the automatic pressure and reduced interruption make the WSA 40 the more productive setup.
Masseys product assessment: prepared by the Masseys garden machinery and construction-equipment team in Woodville, Swadlincote. Product information checked July 2026.
How does the STIHL WSA 40 work?
Fill the transparent container with suitable clean water up to its marked maximum level. Secure the pump head, insert the AS 2 battery and connect the supplied hose to the water inlet on the compatible cut-off machine.
Press the power button to activate the pump, then use the rotary control to choose the required operating pressure. The pump builds pressure inside the tank and automatically restarts when the pressure falls below the selected level.
When the connected machine stops drawing water, the pump enters standby. It can also switch off automatically after a period without use, helping to avoid unnecessary battery consumption.
The WSA 40 does not generate or continuously replenish its own water. The container must be filled before use, but it can then supply the connected machine without being attached to a live mains-water connection.
Key features
Automatic battery-powered pressurisation
The electric pump automatically applies and maintains pressure inside the container. This reduces the repeated stopping and hand pumping associated with a conventional manual water tank.
STIHL Constant Power electronics help the pump provide consistent performance throughout the usable battery charge.
Adjustable pressure from 1.5 to 2.5 bar
The operating pressure can be adjusted continuously from approximately 1.5 to 2.5 bar using the rotary control on the pump head.
This allows the water supply to be matched more closely to the connected cut-off machine, material and cutting task instead of relying on one fixed pressure level.
10-litre transparent tank
The container has a maximum water-fill capacity of 10 litres. Its translucent construction and marked scale make it easier to see the remaining water and avoid overfilling.
A funnel-shaped opening helps make refilling cleaner and more straightforward on site.
Remember that 10 litres of water weighs approximately 10kg. Allow for the additional weight of the machine when moving a full container and use the carrying handle correctly.
Up to 30 minutes or five tanks per charge
STIHL gives a maximum working time of approximately 30 minutes with one fully charged AS 2 battery. This is equivalent to approximately five full WSA 40 or manual STIHL water-container fills under suitable conditions.
Actual output will vary according to:
- Selected pressure
- Water demand from the connected machine
- Battery temperature and condition
- Ambient temperature
- Cutting technique
- Periods spent in standby
A spare STIHL AS 2 battery may be useful for users completing long or continuous working days.
Four-metre hose and standard coupling
The supplied four-metre hose gives the operator room to position the tank away from the immediate cutting area while maintaining a connection to the cut-off machine.
The standard coupling is designed to connect to compatible STIHL cut-off machine water inlets.
Removable pump head
The battery-powered pump head can be removed from the WSA 40 tank. STIHL also identifies it as compatible with selected other equipment, including:
- STIHL SG 31 manual sprayer
- STIHL TS pressurised water tank
- STIHL SGA 30 cordless sprayer
Compatibility relates to the pump-head and container system. It does not mean the WSA 40 is suitable for every tool in the wider STIHL AS battery range.
LED charge indicator
LEDs on the machine display the remaining battery-charge level, helping the operator judge whether enough capacity remains for the intended work.
Pressure-relief valve
An integrated pressure-relief valve allows the container to be depressurised before the pump head is removed or the tank is opened.
Always switch the unit off, remove the battery and release the pressure in accordance with the STIHL instructions before opening the container.
IPX4 splashwater protection
The WSA 40 has IPX4 splashwater protection when correctly assembled and operated. The covered battery compartment helps protect the battery from water splashes and site dust.
IPX4 does not mean the machine is fully waterproof. Do not submerge the pump, battery or charger, and do not clean them with a pressure washer.
What is included?
- 1 × STIHL WSA 40 10-litre water container
- 1 × removable battery-powered pump head
- 1 × STIHL AS 2 lithium-ion battery
- 1 × STIHL AL 1 standard charger
- 1 × four-metre water hose
- 1 × standard cut-off machine coupling
- Integrated pressure-relief valve
- Product documentation and operating instructions
This is a complete operating set. The battery and charger are included.
STIHL WSA 40 technical specifications
| Manufacturer | STIHL |
|---|---|
| Model | WSA 40 |
| Product type | Cordless pressurised water container set |
| Primary application | Automatic mobile water supply for compatible cut-off machines |
| Battery system | STIHL AS System |
| Included battery | 1 × STIHL AS 2 |
| Included charger | 1 × STIHL AL 1 |
| Rated voltage | 11V |
| Maximum voltage | 12V |
| Maximum water-fill capacity | 10 litres |
| Operating pressure | Approximately 1.5–2.5 bar |
| Hose length | 4 metres |
| Maximum working time with AS 2 | Up to approximately 30 minutes |
| Approximate output per charge | Up to approximately five full tank fills |
| Device weight | Approximately 3.1kg |
| Protection rating | IPX4 splashwater protection |
| Pressure adjustment | Continuously adjustable rotary control |
| Battery indicator | LED charge-level display |
| Manufacturer part number | SA090118515 |
Compatible STIHL cut-off machines
The WSA 40 is designed to supply water to compatible STIHL cut-off machines equipped with an appropriate water connection.
Popular compatible machines available from Masseys include:
- STIHL TS 410 petrol cut-off saw – compact professional machine using a 300mm cutting wheel
- STIHL TS 420 petrol cut-off saw – 350mm machine for greater cutting depth
- STIHL TSA 230 cordless cut-off saw – compact AP System cut-off machine
- STIHL TSA 300 cordless cut-off saw – professional 300mm AP System machine
Always confirm that the machine, cutting wheel and planned application are approved for wet cutting before connecting the water supply.
Why use water when cutting concrete or masonry?
When the cut-off machine and cutting wheel are approved for wet cutting, supplying water to the cutting area can help:
- Bind some of the dust created during cutting
- Cool the cutting wheel
- Reduce loose airborne and settled dust around the immediate cutting area
- Support more consistent wet-cutting conditions
- Maintain a water supply where no mains connection is available
Water suppression does not make cutting dust-free and does not remove the need for an appropriate risk assessment, suitable cutting method, approved PPE and respiratory protection.
STIHL WSA 40 versus the manual water container
| Feature | STIHL WSA 40 | Manual STIHL tank |
|---|---|---|
| Tank capacity | 10 litres | 10 litres |
| Pressurisation | Automatic battery-powered pump | Manual hand pump |
| Pressure adjustment | Continuous rotary control | Pressure generated manually |
| Battery required | Yes – included | No |
| Charger included | Yes | Not required |
| Operator interruptions | Fewer interruptions for repressurisation | Periodic hand pumping required |
| Best suited to | Regular professional and trade wet cutting | Occasional use and lower-cost setups |
Choose the WSA 40 when automatic pressure, consistent water delivery and reduced interruption justify the additional cost.
Choose the manual STIHL pressurised water container when cutting is occasional and periodically pumping the tank by hand is acceptable.
Frequently asked questions
Does the STIHL WSA 40 include a battery and charger?
Yes. The set includes one STIHL AS 2 battery and one AL 1 standard charger.
How much water does the WSA 40 hold?
The transparent container has a maximum water-fill capacity of 10 litres.
How long does the battery last?
STIHL quotes up to approximately 30 minutes of pump operation with one fully charged AS 2 battery. Actual working time varies according to pressure, water demand, temperature and battery condition.
How many tanks can it pump on one charge?
STIHL equates one AS 2 battery charge to approximately five full WSA 40 tank fills under suitable operating conditions.
Does it require a mains-water connection?
No live water connection is required during operation. The tank must be filled with suitable clean water before it is used.
Does the WSA 40 need to be pumped by hand?
No. Its AS 2-powered pump automatically builds and maintains pressure.
What pressure does it produce?
The operating pressure can be adjusted continuously from approximately 1.5 to 2.5 bar.
How long is the hose?
The set includes a four-metre hose with a standard coupling for compatible STIHL cut-off machines.
Can the pump head be used on another container?
STIHL identifies the SG 31 sprayer, TS pressurised water tank and SGA 30 sprayer as compatible with the removable pump-head system.
Is the WSA 40 waterproof?
No. It has IPX4 splashwater protection when correctly assembled, but the pump, battery and charger must not be submerged or cleaned with a high-pressure jet.
Is the WSA 40 a pressure washer?
No. It is a mobile pressurised water-supply tank for compatible cut-off machines and selected STIHL container systems. It is not designed for pressure-washing surfaces.
Can the included AS 2 battery power a TSA cut-off saw?
No. The AS and AP platforms are different systems. The WSA 40 pump uses an AS 2 battery, while cordless cut-off machines such as the TSA 230 and TSA 300 use STIHL AP batteries.
Important safety information
- Read the WSA 40 and connected cut-off-machine instructions before use.
- Use only suitable clean water and approved applications.
- Do not exceed the marked maximum fill level.
- Check the tank, hose, coupling and pressure-relief valve before work.
- Switch off, remove the battery and release pressure before opening the tank.
- Keep the battery-compartment cover correctly closed during operation.
- Do not immerse the pump, battery or charger.
- Do not use the tank as a drinking-water container.
- Use the required eye, hearing and respiratory protection.
- Follow the cutting-wheel instructions and site risk assessment.
Water helps control dust but does not eliminate hazardous exposure. Use appropriate dust-control measures, PPE and respiratory protection for the material being cut.
Why buy the STIHL WSA 40 from Masseys?
Masseys is a STIHL dealer and garden machinery specialist based in Woodville, Swadlincote. Our team can help you match the correct water-supply system, cut-off machine, battery setup and cutting wheel to the intended material and workload.
- Genuine STIHL WSA 40 set
- AS 2 battery and AL 1 charger included
- Advice on compatible STIHL TS and TSA machines
- Manual and cordless water-supply options available
- Replacement STIHL batteries and chargers
- Cutting wheels and related accessories available
- Local showroom in Woodville, Swadlincote
- On-site garden machinery workshop and aftersales support
Explore the STIHL machinery range at Masseys or visit our machinery servicing and repair department.
For advice about the WSA 40, compatible cut-off machines or suitable cutting wheels, please contact Masseys or visit our store at 129 Swadlincote Road, Woodville, Swadlincote, Derbyshire, DE11 8DA.
