Footprint and capacity are easy to compare on paper and hard to compare on a concrete floor. One machine looks small because the brochure prints only the cabinet, while the operator also needs room for handles, hoses and a walking path. The other machine looks sufficient because it lists a large tank, yet the crew cannot refill it where they work. Before you shortlist any hot water and steam cleaning machine, write down the clear floor area of your bay, the water and power available in that area, and the number of jobs one shift has to finish. Those three numbers decide the machine more than any specification line does.
Measure the floor you actually have, not the cabinet size
Published dimensions usually answer one question: will the machine fit through the door and sit in its corner. They do not answer the question that matters in a car wash or a garage: how much clear width a person needs to push it and to walk around a vehicle while holding a lance. Check whether the listed size includes handles and wheels, because handle bars are the part that collides with a wall, a column or a parked car. Then compare that number with the narrowest point on the route from storage to the wash area, not with the middle of the bay.
PowerDe lists its Fixed Steam Cleaning Machine PowerDe HW02 at 1,200 × 800 × 1,200 mm including handles, with a tap-water inlet and a 220 V working voltage. Those figures describe a unit that sits in one wash position and is moved by an operator on a hard, level surface. If your route crosses an expansion joint, a drainage grid, a cable trunk or a step, that route has to be walked with the machine before you order, because a footprint that fits on a drawing can still fail on a real floor. Compare the same four measurements — length, width, height and whether handles are included — for every model you look at; without that note, the numbers are not comparable.
Separate tank volume from capacity
A water tank is a buffer, not a capacity figure. The HW02 detail page gives an 80 L SUS304 tank on a 220 V machine with 6 kW heating power, 160° steam temperature and 0.8 MPa vapor pressure, plus switching between dry steam and wet steam and an integrated vacuum function. That combination suits fixed positions where a water line is reachable. The same tank on a machine with no water supply nearby means the crew carries hoses across the site or stops to refill in the middle of a job, and the shift plan absorbs that time.
Do the arithmetic for your own week. A hot-water cleaning mode on a steam machine is used to loosen road film on exterior panels and heavy deposits in wheel arches; a steam pass is used for engine bays, interiors and grease. Count the vehicles or surfaces your staff clean in one shift, and ask how long the machine takes to reach working temperature after a cold start and after each refill. Those two intervals sit between jobs and reduce throughput whether or not they appear on the specification sheet. The HW02 page does not publish runtime per tank or duty cycle, so treat both as questions for the manufacturer in writing rather than as numbers you calculate yourself.
Capacity is a shift plan, not a nameplate
Buyers often compare two quotes by tank volume and heating power alone. A fairer comparison answers four practical questions:
- How many jobs can one operator complete between refills, given the water and drainage you already have?
- Where does the machine connect to water and power, and is that point usable in winter and at night?
- Which mode does the crew need most often — hot water for open panels and floors, or dry steam for surfaces that must stay nearly dry?
- What happens when one machine is down: is there a second unit, or does cleaning stop?
If the wash point has no permanent power or water run, a battery option in the same series moves the whole question away from the electrical panel. PowerDe lists driving-style and hand-pushed units with and without battery in the Cleaning Equipment Series for garages and narrow parking areas, so the choice is often between a fixed machine at a prepared station and a mobile machine covering several loose positions. Do not transfer the HW02 figures to a mobile model; published parameters differ by model, and several values for mobile units are not published at all.
What the two modes are actually for
Hot-water work uses volume and heat to lift loose soil: body panels, wheel arches, garage floors, mats and the flat surfaces a vehicle presents to the wash. Steam work uses heat and pressure at close range on stuck deposits, and it leaves far less water behind, which matters in interiors, engine compartments and enclosed equipment. A machine that offers both modes lets one operator change the method instead of changing the machine. Ask which mode the supplier intends you to use for your stated job, and ask them to say it in the quotation, because marketing pages often describe both modes without assigning either to a duty.
Also ask what the hot-water mode does not do. It does not remove loose grit from under a chassis before contact, and it does not replace the containment or drainage arrangements your site requires for wash water. Those are site conditions that a machine brochure will not solve for you.
Run the comparison as a test, not as a spreadsheet
The fastest way to make footprint and capacity comparable is to test both candidate machines on the same duty in your own space: the same vehicle, the same panels, the same soil level, the same operator, the same start and finish times. Record the time to reach working temperature, the number of jobs per tank, whether the machine cleared the narrowest point on its route, and how much walking distance the hose adds. Keep that record; it becomes the basis of your next purchase and of any claim you make to a landlord or a facilities team.
Send the supplier the same facts you recorded: clear width and height of the entry and the bay, floor condition and drainage, available voltage and water connection, vehicles or surfaces per shift, and the soil you are removing. If your station does not match a catalogue configuration, PowerDe also offers customized steam cleaning equipment work, so an unusual bay can be discussed rather than forced into a standard model. Confirm published figures in writing before ordering, since not every value is listed on every product page and naming on the site is not fully consistent.
