Choosing the wet-steam mode is a decision about the room, not about the machine. The same mode that finishes a task in one bay will leave standing water, a blocked drain and a second shift of labour in the next one. Before an operator commits to a mode, the site has to be read in the order the work will actually happen: which surfaces are in scope, where the water goes, whether the machine can be supplied and powered from where it will stand, and how long the surface takes to be handed back.
Write the surface list before naming a mode
Wet steam carries more water than the drier settings, so the first site fact is not a specification sheet but a list. Group surfaces by what they tolerate: bare metal, painted steel, plastics and trim, elastomer hoses and seals, adhesively bonded parts, and anything with an opening. For each group note the soil as it actually presents itself, because a fresh oil film, an oxidised tacky deposit and a film holding abrasive dust all behave differently under a wetter stream, and the third one moves the grit somewhere else instead of removing it.
Ask for the commercial steam cleaning equipment range with that list attached. A supplier who answers the list can explain why one setting suits one surface group and not another; a supplier who answers with a model number has not read your site at all.
A written no-spray list is a site requirement
A wetter mode means more water reaching the surface, so the boundary of the task must be decided in advance and in writing. Control cabinets and junction boxes, drives, sensors and encoders, cable chains and connectors, ways covered by an oil film, bonded insulation, vents and breathers, and on vehicles the intake path, ignition components and fuse and relay boxes all belong on that list. The person who signs it should be the one accountable for the equipment, not the operator standing there with the gun, because the list also determines which nozzle and which stance are permissible.
How much water the floor can take, and where it leaves
The practical limit on wet steam is the site's liquid budget. Two questions decide it. First, is there a drain or channel in the work area, and does it lead somewhere designed for oily water, such as an interceptor, rather than to a rainwater system. Second, if there is no drain, who collects the runoff and how. A larger tank on a machine that has nowhere to discharge does not extend the job; it converts a dry task into a manual cleanup.
Ask the supplier to describe, in words, the expected water volume per hour for a stated nozzle, working distance, number of passes and dwell time. Without that description you cannot compare two offers on the one number that matters, which is whether your floor and your drainage can absorb the method.
Power and supply at the position the machine will stand
Walk the route and check utilities where the machine will actually sit, not somewhere on the property. Note the nearest protected circuit and whether the cable has to cross a walkway, a grille or a kerb; note the walking distance to the nearest water point and how the tank is refilled during a shift; note door widths, thresholds and gradients along the route. The PowerDe HW02 steam cleaner page lists a 220 V working voltage, 6 kW heating power, an 80 L SUS304 tank and a half-inch tap-water inlet with a 4-point internal-tooth fitting. Treat those figures as the installation conditions a fixed machine demands, not as a claim that any particular surface on your site can be cleaned, and ask that the fittings supplied with the machine be itemised in the quotation instead of assumed.
Refill rhythm and water hardness change what the mode does
Tank size and inlet fitting determine the refill rhythm, and the refill rhythm determines how much of a shift is spent moving. Count the refills and the hose repositioning stops in a single shift on one area, because a wetter mode usually raises both. Scale is the other half of the same question: hardness in mains or borehole water builds up inside heaters and generators, and the first symptom is operators standing closer to the surface or slowing the travel speed to compensate for an output that has drifted. Record who owns descaling, request the inlet strainer, and ask for consumables such as nozzles, seals, filters, hose and gun with part numbers and lead times rather than a promise that spares are available.
Judge the mode by hand-back time, not by the wet look
Savings on water mean little if the surface stays wet for longer, because the area cannot be returned to service and the floor remains a slip risk. Measure the interval from the last pass of the gun to the moment the area can be walked on and handed back, and compare it with the method you use today. Define pass criteria before the trial in checkable terms: bare metal visible on the nominated panels, no residue on a catch tray, guards and filters refitted, no standing water in the bay, lamp and camera housings confirmed dry, and the floor safe to walk. Save one line of record per area, with the mode, nozzle, working distance, travel speed, number of passes and dwell time fixed and signed by the operator, and photograph the same area from the same angle.
Safety items to review when the setting gets wetter
Review the protection items named on the product page, such as leakage, short-circuit, high-temperature, high-voltage and water-shortage protection, as alarms to be logged and investigated, not as buttons to reset repeatedly. A water-shortage stop usually points at the supply rather than at a fault, but the cause still belongs on the record. Longer hose and extension lance lengths change the working distance and the operator's stance, which in turn changes both steam exposure and how much water lands on one spot; the Cleaning Equipment Series page names the dry-steam, wet-steam and hot-water modes, so use the mode names when you ask what liquid load each setting delivers at your nozzle.
Where wet steam is the wrong answer
Say it plainly when the site fails the test. Areas that cannot tolerate water, positions with no way to contain or route the runoff, films carrying abrasive dust, and equipment that cannot be isolated and allowed to dry within the available window are not wet-steam tasks, and no nozzle choice rescues them. Where the standard machine does not fit the site, raise customized steam cleaning equipment as the outcome of your survey rather than as a starting assumption, and send the surface list, the signed no-spray list, soil photographs, the timed records and the drainage facts instead of asking for a model.
If you want the site read against a specific machine, contact PowerDe with those same records.
