1. What is being cleaned: hull, deck, or engine bay?
Surface type decides the machine. Gelcoat and topsides need a method that lifts salt and biological growth without scouring the finish. Non-slip deck surfaces trap dirt in their texture, so a rinse that only wets the surface leaves residue behind. Engine compartments add oil and fuel residue to the same equation. PowerDe's Fixed Steam Cleaning Machine PowerDe HW02 is documented for vehicle exterior cleaning, interior work, and engine-compartment cleaning, and it switches between dry steam and wet steam on the same machine. That switch is worth asking about for marine use, because dry steam carries less free water onto a surface than a wet stream, and free water is what creates runoff on a dock, in a dry-stack yard, or anywhere drainage is limited.
2. Steam temperature, not just spray pressure
Most quotations lead with pressure, because pressure is easy to compare. For marine surfaces, ask what the medium actually is at the nozzle. High-temperature steam softens hardened grime and grease so the operator can work it off with far less mechanical scrubbing, which matters on coatings, seals, deck hardware, and cove areas where brushing is the wrong tool. Ask for the steam temperature and vapor pressure figures in writing, and confirm that the specification is the machine's working output rather than a boiler reading taken at the unit. Vendor data sheets do not always state this on the same basis, so it is one of the first items to clarify before any price comparison.
3. Fixed unit or mobile unit?
A fixed machine works well where boats come to a wash bay, a hard standing, or a service point with a stable power supply. The PowerDe HW02 is listed as a 220 V fixed unit with an 80 L tank, which suits a fixed work position. Where the boat cannot move, mobility is the constraint: PowerDe's driving-style models (PWD01, PWD02, HMW2) are built for narrow indoor garages and tight outdoor parking spaces, and the battery-included variants operate away from a fixed power point. Before choosing, map the physical route: distance from power and water to the berth, cable and hose length, and whether the operator walks the machine or drives it to the job.
4. Water use and discharge
On the water, discharge control is not a sustainability talking point; it is a compliance requirement and an operational limit. High-temperature steam cleaning achieves cleaning with far less water than continuous pressure washing, so there is less runoff to capture, treat, or explain to a harbour authority. Ask the supplier to state water consumption for your duty cycle in litres per hour and confirm whether the figure is a measured working value or a nominal specification. The site's own records do not publish a consumption figure for every model, so a written answer to this question is one of the strongest screening tests of a supplier's technical responsiveness.
5. Chemical dependence versus heat
Ask how much of the cleaning load the machine carries through heat alone. Steam reduces reliance on chemical detergents, which matters around antifouling coatings, anodes, rigging, through-hull fittings, and any area where runoff reaches the water. The question to put to each vendor is specific: for a salt line on a topside and an oily bilge, what is the process with no chemical, and what is the process with one? A credible supplier answers both.
6. Protection and safety on a wet, powered deck
Marine work puts an energised machine, water, and metal in the same place. Ask which electrical protections are built in. PowerDe's documentation for the HW02 describes leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. Request the same list for the exact model you are quoted, and confirm which protection is a device feature rather than an accessory you have to add.
7. Supplier capability, not just the brochure
Cleaning a hull is a variation of the same problem set as cleaning equipment for vehicles, transport fleets, food facilities, and medical environments: hard surfaces, grease, biological growth, limited water, and a need for repeatable results. Shenzhen PowerDe Automation Precision Equipment was established in 2007 in Shenzhen and presents itself as an intelligent cleaning equipment manufacturer with customised configurations, OEM and ODM work, and equipment testing. Ask for a demonstration on your own surface type, and ask the supplier to state which claims are covered by their own test data. Figures printed on a website sometimes differ between pages, so take the specification from the machine you are shown.
The shortlist test
Put the same seven questions to every supplier and compare answers, not brochures. The yard that can name steam temperature at the nozzle, water use per hour, the protection set for the quoted model, and the fixed-versus-mobile tradeoff for your berth layout is the one that has actually worked on marine surfaces. For a quotation built around your surfaces and your discharge rules, contact PowerDe at sales@powerde.net or +86 13023198376.
