Window Vacuum

Overview

A window vacuum solves the last step of window cleaning: getting the dirty water off the glass. A manual squeegee strips the film but sheds it down the pane and onto the sill; this tool vacuums the stripped liquid into a sealed tank as the blade wipes, leaving no drips and no towelling. The format was established by Kärcher's WV series in 2008 and the architecture has barely changed since: a pistol-grip handheld of about 0.6 kg with a wide Squeegee Suction Head, a small Suction Motor Unit, a 100 ml Dirty-Water Tank, and a single lithium-ion cell in the handle.

Washing itself still happens manually. The kit's separate Spray Applicator, a 250 ml Spray Bottle with a Trigger Pump and a Microfibre Pad on a Pad Frame, sprays diluted solution and scrubs the dirt loose. The vacuum then does the recovery pass.

How it works

The working edge is the 280 mm silicone Squeegee Blade, held at a constant attack angle by the Blade Carrier. Drawn down the pane, the blade strips the liquid film exactly as a manual squeegee does. Immediately behind the lip, the full-width Suction Slot sits in the airflow generated by the motor; the stripped water has nowhere to go but into the slot, entrained in air moving fast enough to carry droplets upward even when the tool works overhead. Two Head Latch clips swap the standard head for a 170 mm one for glazing bars and shower panels.

Inside, the DC Suction Motor, a brushed 3.7 V unit drawing about 10 W, spins the Suction Impeller to create the suction. Ten watts sounds trivial next to a floor vacuum's kilowatt, but the tool only lifts a thin water film through a short path, so the duty is mild and the runtime long: about 35 minutes, or 105 m² of glass, per charge.

The critical engineering is keeping that water away from the electronics. Air and water enter the Dirty-Water Tank together, where the Air-Water Separator baffle spins the mixture so droplets coalesce on the tank wall and drain down while only air continues to the impeller. The Motor Seal backs this up at the motor boundary, and the Anti-Spill Valve holds the contents in when the tool is tilted, laid flat, or worked upside down on a skylight. The translucent Tank Shell holds 100 ml, roughly 35 m² of windows, and empties through the Drain Plug or by unclipping the tank over a sink.

Power and electronics

The handle houses a single Li-ion Cell, 18650 cell with a BMS Board providing over-discharge and short-circuit protection, charged through a Charge Port at 5 V over USB-C in about 165 minutes. The Control Electronics board is minimal: an Microcontroller supervising the cell, one Power MOSFET switching the motor, and a two-colour LED Indicator for run, charge, and low-battery states. There is one control, the Power Switch slide on the handle spine.

Technique and use

The tool works best top-down in overlapping vertical strokes with the blade flat to the glass; the suction recovers the edge bead that manual squeegee work has to chase with a cloth. Besides windows it handles any smooth wet surface, shower screens, tiles, mirrors, car glass, and doubles as a condensation collector on single-glazed windows in winter, where a morning pass recovers the overnight condensate before it reaches the frame.

Maintenance

The silicone blade is the only consumable, replaced when its edge nicks or streaks appear, typically once or twice a season. The tank and separator rinse under a tap; the microfibre pad is machine washable. The cell is sized for several hundred charge cycles, and on most current models the tank, blade, and pad are sold as standard spares so the tool outlives all three.