SIP CW4000 Pro Plus Electric Pressure Washer

Variable Pressure Precision Meets Commercial-Grade Durability — Designed in Italy

Introducing the SIP CW4000 Pro Plus Electric Pressure Washer — a professionally engineered commercial cleaning machine that combines the raw power of a 2.8kW brushless induction motor and brass-headed Triplex crankshaft pump with the precision of an adjustable pressure regulator for variable output up to 150bar (2175psi). Designed in Italy and built around heavy-duty components rated for double the operational lifespan of standard machines, the CW4000 Pro Plus is the intelligent choice for commercial operators who need both maximum power and precise control across a wide range of cleaning applications.

Why the SIP CW4000 Pro Plus Stands Out

Most commercial pressure washers deliver a fixed pressure output — what you get is what you get, regardless of the task. The CW4000 Pro Plus takes a more sophisticated approach. Its adjustable pressure regulator allows the operator to fine-tune output precisely for each specific application — protecting delicate surfaces at lower settings while unleashing full commercial power for the toughest jobs. Combined with the long-term reliability of a brushless induction motor, Triplex crankshaft pump, and heavy-duty stainless steel valves, the CW4000 Pro Plus delivers both versatility and durability that fixed-output machines simply cannot match.

Key Features & Benefits

Adjustable Pressure Regulator — Precision Control for Every Task

The defining feature of the CW4000 Pro Plus is its built-in adjustable pressure regulator, which allows variable pressure output to be fine-tuned from low settings right up to the maximum 150bar (2175psi). This single feature transforms the machine's versatility — one moment delivering gentle, controlled pressure for sensitive surfaces, the next unleashing full commercial power for heavily soiled industrial environments. No nozzle changes, no guesswork — simply dial in the exact pressure the task demands.

2.8kW 4-Pole Brushless Induction Motor — Commercial Endurance Built In

The CW4000 Pro Plus is powered by a 2.8kW (3.8hp) 4-pole low-rotation brushless induction motor running at just 1450rpm. This lower rotational speed is a deliberate engineering choice — significantly reducing heat generation, friction, and mechanical wear compared to higher-speed brush motors. Without brushes to degrade or replace, and running at nearly half the speed of conventional motors, this is a motor specification designed for sustained commercial use and a substantially longer operational lifespan.

Brass-Headed Triplex Crankshaft Pump — Double the Lifespan

The SIP brass-headed Triplex crankshaft pump is the engineering cornerstone of the CW4000 Pro Plus's exceptional durability. Three pistons working in sequence deliver smoother, more consistent pressure output with less vibration than single or dual piston configurations, while the brass pump head provides outstanding resistance to corrosion from water minerals and cleaning chemicals. The crankshaft drive mechanism is inherently more efficient and durable than wobble plate alternatives — and SIP rates this pump configuration at double the operational lifespan of standard pump systems.

Heavy-Duty Stainless Steel Valves — Uncompromising Internal Quality

The CW4000 Pro Plus features heavy-duty stainless steel valves throughout — a component specification that directly reflects its commercial-grade credentials. Stainless steel valves resist corrosion and wear at a level far beyond standard alloy or plastic alternatives, ensuring consistent sealing, reliable pressure delivery, and reduced maintenance requirements over the machine's extended working life.

Total Stop Function — Protecting Performance & Reducing Running Costs

The Total Stop function automatically cuts motor power when the trigger is released, restarting instantly on demand. This prevents unnecessary pump loading between bursts of use, reduces energy consumption throughout a cleaning session, and directly contributes to the long-term preservation of both the motor and pump. On a machine designed for heavy commercial use, Total Stop is an essential feature rather than an optional convenience.

150bar Maximum Pressure & 540L/hr Flow Rate

The CW4000 Pro Plus delivers up to 150bar (2175psi) of maximum pressure with a flow rate of up to 540L/hr — providing the combination of sustained pressure and water volume needed to tackle large commercial cleaning tasks efficiently. The adjustable regulator means this power is always delivered at precisely the level required rather than at a single fixed output.

10m Hose & Industrial Steel Lance with Adjustable Nozzle

The CW4000 Pro Plus is equipped with a generous 10-metre pressure hose — double the length of standard domestic machines — paired with an industrial steel lance fitted with an adjustable nozzle. The adjustable nozzle provides on-lance spray pattern control in addition to the machine-level pressure regulation, giving the operator two independent levels of output adjustment for maximum precision across every cleaning scenario.

Integrated 1.8-Litre Detergent Tank — Chemical Cleaning Capability

The onboard 1.8-litre detergent tank draws cleaning solution directly into the water stream for targeted chemical cleaning alongside pressurised water — enhancing performance on grease, oil, and stubborn biological soiling where water pressure alone is not sufficient.

Extra-Large Wheels — Stable Mobility on Uneven Terrain

At 34.2kg, the CW4000 Pro Plus is built with the robustness its commercial specification demands. Its extra-large wheels are designed specifically for confident movement across the uneven ground, gravel, cobbles, and rough terrain of commercial sites, agricultural premises, and outdoor industrial environments — keeping the machine stable and easy to position wherever the job requires.

Full Specifications

What Can the SIP CW4000 Pro Plus Clean?

• Commercial vehicle fleets — Variable pressure allows gentle cleaning of paintwork at lower settings and full power for undercarriages and chassis
• Industrial & workshop flooring — Strip oil, grease, chemical residues, and heavy soiling from concrete and industrial surfaces
• Agricultural machinery & premises — Clear mud, slurry, and biological contamination from farm vehicles, equipment, and livestock housing
• Construction plant — Remove caked mud, concrete residue, and bitumen from heavy plant and site machinery
• Building exteriors — Clean rendered walls, cladding, and masonry with precisely controlled pressure to suit the surface
• Car valeting & detailing — Fine-tune pressure for safe paintwork cleaning, then increase for wheel arches and underbodies
• Large driveways & hard surfaces — Cover expansive areas efficiently with 540L/hr flow rate and 10m hose reach
• Sensitive commercial surfaces — Lower the pressure via the regulator for surfaces that would be damaged by full output

CW4000 Pro Plus vs SIP TEMPEST P660/150 — Choosing the Right SIP Machine

The P660/150 prioritises raw flow rate and a larger detergent tank for high-volume commercial applications. The CW4000 Pro Plus prioritises precision and control — with its adjustable pressure regulator, adjustable lance nozzle, and stainless steel valves making it the better choice for operators who need variable pressure output across a diverse range of surfaces and cleaning tasks.

Frequently Asked Questions

How does the adjustable pressure regulator work? The built-in regulator allows the operator to set the machine's output pressure anywhere from low to the maximum 150bar — independently of nozzle selection. This means pressure can be dialled in precisely for each task at the machine itself, with the adjustable lance nozzle providing further fine-tuning at the point of application.

What is the advantage of a Triplex crankshaft pump over a standard pump? Three pistons operating in sequence deliver smoother, more consistent pressure with less vibration and pulsation than single or dual piston alternatives. The crankshaft drive is more mechanically efficient and durable than wobble plate designs, and the brass pump head resists corrosion from water minerals and chemicals — all contributing to SIP's double lifespan rating for this pump configuration.

Why are stainless steel valves significant? Valves are critical sealing components within the pump system. Stainless steel offers far superior corrosion and wear resistance compared to standard alloy or plastic valves — maintaining precise sealing performance over a significantly longer service life, particularly under sustained commercial use with varied water quality and cleaning chemicals.

Does the CW4000 Pro Plus have a self-priming function? No. The specification confirms the CW4000 Pro Plus does not draw from a still water source — it requires a mains water supply connection for operation.

What power supply does the CW4000 Pro Plus require? The CW4000 Pro Plus operates on a standard 230V 13A supply — compatible with a standard domestic or commercial socket with no specialist wiring required.

Is the 1.8-litre detergent tank sufficient for commercial use? The 1.8-litre tank is designed for targeted detergent application rather than high-volume foam coverage. For operations requiring larger quantities of cleaning chemical, the tank can be refilled as needed. For extensive snow foam or large-area chemical application, the SIP TEMPEST P660/150 with its 7.5-litre tank may be the more appropriate choice.

How does Total Stop benefit the pump specifically? When the trigger is released without Total Stop, the pump continues to run and recirculate water under pressure — generating heat and accelerating wear on internal components. Total Stop eliminates this entirely by cutting motor power immediately on trigger release, directly reducing pump wear and extending service life.

Order the SIP CW4000 Pro Plus Today

The SIP CW4000 Pro Plus Electric Pressure Washer is the intelligent commercial pressure washer for operators who demand both power and precision. With an adjustable pressure regulator, 2.8kW brushless induction motor, brass Triplex crankshaft pump rated for double the lifespan, heavy-duty stainless steel valves, a 10m hose, and industrial steel lance with adjustable nozzle — the CW4000 Pro Plus delivers the control and durability that serious commercial cleaning demands, in a machine designed in Italy and built to last.

Product Code: 08978