A quotation for a fixed steam cleaning machine usually arrives with two numbers that look comparable at first glance: a footprint in millimetres and a tank capacity in litres. On their own they mean very little. A 1,200 mm cabinet in one workshop is a permanent installation with a water inlet and a drain nearby; the same width in another bay has to pass through a 1,000 mm doorway on the way to the vehicles. Before you shortlist anything, decide what the machine has to do in your space, and only then compare the numbers against that requirement.
Start from the installation point, not from the datasheet
A fixed machine stays where you put it. That single fact decides more of the specification than any performance figure. Ask three questions first:
- Where will it stand permanently — indoors on a level floor, under a canopy, or outside?
- What supply is available at that point: a 220 V outlet, a tap-water connection, or both?
- What has to move around it — vehicles, trolleys, staff, a wash bay wall?
If the answer is an indoor garage or a narrow outdoor parking space where the operator moves with the machine, a stationary cabinet may be the wrong form factor altogether. PowerDe lists driving-style and hand-pushed steam cleaning machines alongside the fixed units, and those are built to be taken to the vehicle rather than plumbed into one spot. Comparing footprint and capacity only makes sense once you have confirmed that a fixed machine fits the work.
How to read footprint: three different numbers
Suppliers quote cabinet dimensions in inconsistent ways, and the differences matter when space is tight.
- Overall dimensions including handles. The PowerDe HW02 detail page lists 1,200 × 800 × 1,200 mm including handles. Handles, hose reels and bumpers usually add more than the bare cabinet, so ask which figure you are being given.
- Footprint versus clearance. The floor area the cabinet occupies is not the area it needs. Hoses, power cable and a water hose each need a route, and a machine shut against a wall cannot be serviced.
- Access route. Measure doorways, corners and any threshold before the machine arrives, not after. A unit that fits the bay but not the door is a costly problem.
Write your own layout to scale on paper: the bay, the wall, the water inlet, the electrical panel. Place the quoted footprint on it with a working radius around it. If the machine cannot be wheeled out for maintenance without draining and disconnecting, the footprint is wrong regardless of the number.
How to read capacity: tank size is a buffer, not a rating
A tank holds water between refills. It does not tell you how much steam the machine produces or how long it can run. Two capacities deserve separate attention:
- Tank volume and material. The HW02 is listed with an 80 L SUS304 tank. Stainless steel of that grade resists the corrosion that a plain steel tank picks up when it is repeatedly heated and left partly full.
- Water inlet. The HW02 takes tap water through a 4-point internal-tooth fitting (1/2 inch). With a plumbed inlet, tank size stops being the limiting factor; with a manual fill, it sets how often someone stops to refill.
Ask for the heating power, steam temperature and vapor pressure separately. The HW02 page states 6 kW heating power, a 160° steam temperature and 0.8 MPa vapor pressure. Those figures describe what the machine delivers; the 80 L tank describes how much water it carries while delivering it. Do not let a larger tank in a quotation imply a more capable high-pressure steam cleaning machine.
Match the pair to your actual workload
Count the jobs you expect in a typical day before you choose a capacity band. A machine at a gas station or parking lot that washes vehicle exteriors, vacuums and disinfects interiors, and cleans engine compartments runs in short cycles with gaps between them, and a tank that carries it through a shift without refilling is an advantage. A machine used for a few jobs a day wastes money on capacity it never uses.
The same logic applies to size. PowerDe's HW02 page places the fixed unit at gas stations and parking lots for vehicle exterior cleaning, interior vacuuming and disinfection, and engine-compartment cleaning. If your work is that pattern, a fixed cabinet near the bay is the sensible layout. If your work is spread across a site, or if you cannot run water and power to one point, a mobile unit will do the same cleaning with far less space planning.
Features that change the space and capacity maths
- Dry and wet steam modes. A machine that switches between the two covers heavy grease with wet steam and finishing or lighter soiling with dry steam, so you buy one cabinet instead of two.
- Integrated vacuum. The HW02 combines dry/wet steam with a vacuum cleaner for interiors, which removes a second machine from the floor.
- Protection functions. The HW02 overview lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protection, including protection against high-voltage explosion. Because the site has recorded these items at different counts, treat the list of functions as what matters rather than the total quoted.
Every integrated function reduces the equipment on your floor, which is often a better use of space than a larger tank.
A short checklist for the comparison
- Confirm that the quoted dimensions include handles, hoses and bumpers, and check them against your access route as well as the bay.
- Ask whether the inlet is plumbed or manual, then size the tank against your shift pattern rather than the datasheet.
- Require heating power, steam temperature and vapor pressure in writing next to the capacity figure.
- Confirm the supply requirements — for the HW02 that is a 220 V working voltage and a tap-water connection — at the exact installation point.
- Where your site mixes fixed and mobile work, ask the supplier about both; Shenzhen PowerDe Automation Precision Equipment develops and manufactures intelligent cleaning equipment and offers customised configurations, so the choice between a fixed cabinet and a mobile unit is one you can settle with the manufacturer.
Footprint and capacity are not two figures to rank against each other. They are answers to two different questions: where the machine can live, and how long it can run before it needs water. Set your own layout and shift pattern down first, and the comparison usually decides itself.
