Most of PowerDe's cleaning machines list a dry-steam mode alongside wet steam and, on some models, hot water. The cleaning equipment series shows this pattern across fixed, hand-pushed and driving-style units. A spec line that says "dry/wet steam" tells you the machine has two modes; it does not tell you what separates them, which jobs each one is meant for, or what your site must provide. Before you order a machine because of that line, these are the questions worth putting to the supplier.
1. What does "dry steam" mean in this machine?
Ask the supplier to define the term for the specific model, not for steam cleaning in general. What leaves the nozzle in dry mode, and how does it differ from what leaves the same nozzle in wet mode? Is the difference created in the boiler, at the gun, or at the nozzle? If the supplier cannot explain the mechanism, the mode is a marketing word rather than a feature you can plan work around. Get the definition in writing as part of the quotation, so that both sides are comparing the same thing.
2. Where is the mode switched, and what does switching ask of the operator?
Find out whether the change happens at the machine, at the gun, or by swapping nozzles; whether it can be made mid-task; and whether switching requires purging, waiting for pressure, or draining. A mode that takes two minutes and a trained operator to change will be used less often than one that takes a trigger. Ask which mode your crew should default to for each task, and write that rule into the work instructions you build with the supplier.
3. Which temperature and pressure figures apply in dry mode, and where are they measured?
The PowerDe HW02 fixed steam cleaning machine publishes a 160 °C steam temperature and 0.8 MPa vapor pressure. Ask where those figures are measured — at the boiler or at the nozzle — and whether they hold in both modes or only one. Saturated steam ties pressure and temperature together, so a single pair of numbers usually describes one state of the steam, and what arrives at the nozzle after a length of hose is what actually does the work. Ask for nozzle-side figures, or for the expected loss over the hose length you will use.
4. Which surfaces and soil conditions is dry mode intended for?
The HW02 product page describes vehicle exterior cleaning at gas stations and parking lots, interior vacuuming and disinfection, and engine-compartment cleaning. Ask the supplier to confirm, in writing, which of your surfaces and soil types dry mode is meant for, and which should be handled in wet mode or with hot water instead. If your use case is not on their list, ask whether they have cleaned that surface with this machine and what the result was. A supplier who has done the job can describe it; one who has not will tell you it is fine.
5. How much moisture is left, and how long before the surface is ready for the next step?
Lower residual moisture is often the reason a buyer looks at dry mode in the first place — a bay that returns to service sooner, an electrical area where standing water is a risk, an interior that must not stay damp. Ask how damp a surface will be after dry-mode cleaning and how long before it can be touched, reassembled or returned to service. An answer given in minutes for a named surface is useful; "it dries quickly" is not. During a trial, time that interval yourself on three representative surfaces and keep the record.
6. How long does the machine run in each mode before the tank is empty?
The HW02 carries an 80 L SUS304 tank with a tap-water inlet. The product page does not state run time per mode or recovery time after refilling, so ask for both, and ask what "recovery" includes: refilling, reheating and re-pressurising. Those numbers decide whether one machine covers a shift or whether you need a water run and a waiting period built into the schedule. Plan the water supply and drainage around the answers, not around the tank size alone.
7. What must the site provide, and what do the built-in protections not cover?
The HW02 is listed at 220 V with 6 kW heating power, and the page lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protection. Those protections guard the machine. They do not guard the room or the operator. An electrician still needs to confirm a dedicated circuit at the point of installation; ventilation for steam in occupied indoor space is still your responsibility; so is where the condensate drains. Ask the supplier what personal protective equipment and training they expect for dry-mode work, and what clearance and flooring they assume.
8. What evidence can you give me before I order?
Ask whether the supplier can clean one of your own surfaces or parts with the machine in dry mode, with acceptance criteria agreed in writing beforehand — what counts as clean, how it will be checked, and who checks it. Ask for the operating manual, a spare-parts list with lead times, and the service terms that apply to your region. A trial result you recorded yourself, attached to the quotation, is worth more than any paragraph of brochure text.
What dry mode does not do
A few limits are worth stating plainly, because they come up after delivery rather than before. Dry mode does not rinse: steam loosens soil, and the wiped or extracted material still has to go somewhere, so cloths or a vacuum belong in the same job description. It does not reach duct interiors, drains or grease traps. And it does not replace the maintenance tasks that keep the machine running — descaling, hose and seal inspection, and filter cleaning are consumable and wear items, and you should ask who supplies them and how often.
A one-page record for supplier conversations
Take the same eight questions to every supplier you talk to, and write the answers down in the same order. The comparison becomes possible, and a vague answer stands out on its own.
| Question to ask | What to record | Who answers |
|---|---|---|
| What is dry mode in this machine? | Written definition and mechanism | Supplier engineer |
| How is the mode switched? | Location, steps, time, training needed | Supplier |
| Which figures apply in dry mode? | Nozzle-side temperature and pressure | Supplier |
| Which of my surfaces are in scope? | List of surfaces and soil types, mode per task | Supplier |
| How long to dry? | Timings you measured on your own surfaces | Your team, during a trial |
| Run time per tank, per mode? | Run, refill, reheat, re-pressurise times | Supplier |
| What must the site provide? | Circuit, water, drainage, ventilation, PPE | Your electrician and the supplier |
| What evidence comes with the quote? | Trial record, manual, spares list, service terms | Supplier |
A dry-steam mode is only useful if you know what it does on your surfaces, how long it runs, and what your site has to supply around it. Those answers come from the supplier's engineers and from a trial on your own equipment — not from a spec line. If you want to discuss a specific cleaning task before choosing a mode or a model, contact PowerDe with your surfaces, soil types and working hours, and ask for the answers in writing.
