When a cleaning brief names wet steam as the method, the equipment question that follows is rarely about whether the machine offers that mode. It is about which physical form the mode should live in: a unit that stays where it is installed, or a unit that travels to the work. The two forms can carry the same mode name and still produce different results, because the mode decides what reaches the surface while the form decides how often it reaches it, on what surfaces, and at what distance from the point of work. This article compares the fixed and the mobile form on the terms that decide that choice, using the wording published on the supplier's own pages.
Two different jobs, not two sizes of one job
A fixed unit is a place you take the work to. The surface has to arrive within reach of the station: a vehicle driven into position, a part carried to a bench, an assembly lowered onto a stand. A mobile unit is the work you take to the place. The machine follows the surface, and the surface stays where it is bolted, parked, or standing.
That difference is not a matter of size. It changes what the cleaning day consists of. With a station, cleaning time and transport time are separate columns: the queue of waiting work, the handling of each item into and out of position, and the risk that a surface is damaged in the moving rather than in the washing. With a mobile unit, transport happens inside the cleaning pass, so there is no separate queue, but each metre of travel, each corner, each door and each step is a place the machine may not fit.
Neither shape is cheaper in the abstract. A station buys a controlled position, a fixed utility route, and a repeatable stance for the operator. A mobile machine buys coverage of surfaces that cannot be moved and avoids the handling step entirely. The comparison begins by naming which of those two things the site actually needs.
The same mode row answers different questions on the two kinds of page
On PowerDe's product pages, the mobile machines are described as mobile active-water cleaning machines, and the mode list published with them runs from dry steam through wet steam to the hot-water setting. They are presented for use in indoor garages and in tight outdoor parking areas. The PowerDe cleaning equipment listing collects those mobile units alongside the fixed ones, so the mode row can be read side by side across the range.
Read carefully, a mode row on a fixed page and the same mode row on a mobile page are not answering the same question. On a fixed page, the row usually describes what that station is set up to run, in one position, with the utilities already routed to it. On a mobile page, the row usually describes what the machine is able to carry with it, which is a broader promise and a weaker one at the same time: broader because the machine may be taken to many kinds of surface, weaker because nothing in the row says how the mode behaves on each of them once the hose is long, the floor is sloped, or the power at that corner is not the power at the dock.
The practical consequence for an operator is simple. Two pages may both name the mode and still leave you without a comparison. What you need is not the presence of the word but the description of how the mode is delivered, held, and re-established after a stop.
What a mode name does not settle
Wet steam is a delivery condition, not a result. Two things decide whether that condition does any work on a given soil, and neither of them appears in a mode name.
The first is contact. A mode has to reach the soil and stay in contact with it long enough to act. On an open vertical panel, contact is easy to hold. On an overhead surface it drains away; in a seam, a bolt line, or a louver it may never be established at all; on a horizontal shelf it pools and then runs. The form of the machine changes this constantly, because the form decides the angle the operator can stand at, how long the delivery line is, and whether the machine can be brought close enough that the short, controlled pass the mode wants is even possible.
The second is what happens at a stop. Every real job has stops: moving to the next panel, repositioning the machine, opening a door, waiting for something to be removed. A station keeps its setup through a stop. A mobile machine may be switched, relocated, and reconnected, and the mode has to be re-established at the next pass. An operator comparing two machines should ask, in plain words, what happens to the mode after a stop on each of them.
Five site questions that decide which form the mode belongs to
The following five questions sort most real cases. They are answered from the site, not from the brochure.
- Reach. Can the surfaces be brought into one position at all, or do they have to be cleaned where they are? If the answer is mixed, the comparison is not one machine against another but a split list.
- Obstruction. Doors, steps, columns, drainage channels, low ceilings, cables and hoses already in place. A mobile machine that cannot pass a threshold covers nothing on the far side of it, and that is a site fact, not a machine fault.
- Power at the point of work. A station has a designed supply at one place. A mobile machine has to find one, or carry its own. PowerDe's mobile range is published in versions with and without a battery, and that distinction is exactly the question of whether the machine depends on an outlet at the spot where the work is.
- Run-off route. Wet steam leaves something behind, and where it goes is decided before the first pass. A station has a fixed route that can be designed once. A mobile machine generates run-off wherever it happens to be standing, which has to be known in advance for each area it enters.
- Waiting distance. How far is the work from the machine, and how much of the shift is spent covering that distance? A long distance favours the form that moves. A short one exposes the mobile machine to handling and reconnection that a station never needs.
The fixed steam cleaning machine page presents the station form around vehicle work, which is a good illustration of the trade: the vehicle arrives, so position, utility routing and stance are all settled in advance, and the machine never has to negotiate a doorway.
Where both forms appear together, and where that duplication fails
Sites that run both forms usually do so for a defensible reason: a station for the work that can be brought in, and a mobile machine for the work that cannot. The duplication becomes a mistake when the same soil list is handed to both without saying which surfaces belong to which. Then the station is blamed for coverage it was never meant to have, and the mobile machine is blamed for consistency it cannot hold while being relocated.
The fix is a written split of surfaces before any purchase. Each surface gets one owner: station or mobile. Anything that appears on both lists is either a genuine overlap that should be decided once, or a sign that the surface list is not yet understood. A customized steam cleaning equipment enquiry is the place to put that split in front of the supplier, because it is a question about your site rather than about a catalogue line.
The comparison that is worth running: the same soil on both forms
Brochure reading does not settle this. A bounded trial does, and it has to be arranged so that the two forms are treated identically.
Use the same soil, brought from the same place, applied to the same kind of surface, in the same quantity. Same number of panels, same starting condition, same detergent decision (or the same decision to use none), same closing condition for what counts as finished. Run one form, record, then run the other under the same rules. Any difference in outcome can then be attributed to the form rather than to the sample.
Score the trial on the things the mode name cannot tell you: how many passes the soil actually needed, what happened after each stop, whether the run-off stayed where it was planned, whether the operator had to change posture or reposition the machine to reach an awkward surface, and how long the whole area took including all movement. Then have someone who never held the lance judge the panels against the written closing condition. The person holding the wand is the worst-placed observer of their own consistency.
What to ask the supplier in writing
Questions about the mode are easy to answer with a brochure. Questions about the form are harder to dodge, and they are the ones worth sending.
- For the station: which surfaces does the published page actually describe, and which are only conceivable? What must be provided at the position, and who is expected to provide it?
- For the mobile machine: how does the mode behave over a long delivery line, and after a stop and reposition? Which versions depend on an outlet at the point of work, and which carry their own source?
- For both: what the page does not publish. If a figure or a duty is absent from the page, ask for it in writing against your own conditions rather than inferring it from a neighbouring model.
- For your own list: confirmation that each surface you name is one the form you are being offered is presented for. The cleaning pages on this site describe fixed and mobile machines chiefly in relation to vehicle, parking and similar duties; anything outside that wording should be confirmed with the supplier before it is planned into a process.
A supplier who answers those four sets of questions usefully has told you more than any mode list in a catalogue.
What to record, and what to decide afterwards
One page, written during the trial rather than after it: the surface list with its station-or-mobile owner, the soil used, the passes needed, what happened at each stop, where the run-off went, and the name of the person who judged the panels against the closing condition.
That record answers the question the title asks better than any comparison table. It shows, on your surfaces, under your distances and your obstructions, whether the mode delivered in the form you are considering, and whether the remaining problem is the machine at all, or the process standing around it. Review it against the areas you did not test, and put the gaps, not the conclusions, into the next conversation with the supplier.
