When a depot moves from a hand-held pressure wand to commercial steam cleaning equipment, the machine's headline numbers only tell part of the story. Buyers responsible for buses, delivery vans, taxis or service trucks usually discover within a month that fleet washing is decided by water management, power supply, operator movement and safety design — not by steam temperature alone.
Start with the washing bay, not the machine
Walk the route an operator will actually follow. In an indoor garage or a tight outdoor parking area, a driving-style mobile steam cleaning machine such as the PowerDe PWD series travels with the vehicle and suits narrow aisles, where dragging a fixed unit across the yard wastes time. When the depot has a dedicated bay with a stable 220 V supply, a fixed unit such as the PowerDe HW02 stays in one place and feeds a high-pressure lance into the exterior, interior and engine-compartment work. The same fleet can need both patterns: a fixed machine for scheduled deep cleaning, a mobile one for quick touch-ups between shifts.
Then check the utilities you already have. Fixed high-pressure steam machines commonly run on 220 V mains and take tap water through a standard fitting; mobile battery-powered units free you from a cable but put a runtime limit on every shift. Ask the supplier which variant is offered with its battery and which without, because those are frequently listed as separate products with different procurement implications.
Match steam capability to the soil you remove
Fleet dirt is mostly road film, diesel soot, brake dust and packed grease around wheels, sills and engine bays. Dry steam carries less moisture and more heat, which is why it is the practical choice for cutting grease and for surfaces where standing water is unwanted; wet steam adds moisture for loosening stubborn deposits. A machine that switches between the two modes — often with a hot-water mode as well — covers exterior panels, interior trim and engine bays without changing tools. Published specifications you can verify on the product page, such as the HW02's 6 kW heating power, 160 °C steam temperature, 0.8 MPa vapour pressure and 80 L tank, are worth comparing against your bay's power supply and water points rather than against a competitor's brochure.
Evaluate safety and serviceability before price
Steam equipment in a working depot sits next to electricity, water and fuel. Product pages that list leakage, short-circuit, high-temperature, high-voltage and water-shortage protection are describing the exact failure modes a safety officer will ask about, so request those protections in writing and confirm the model's rated working voltage. Ask the same questions about the wetted parts: stainless steel tanks tolerate continuous water duty far better than uncoated ones, and a tank sized for your shift reduces refills in the middle of a wash cycle.
Also settle who services the machine. Heating elements, pumps, seals and nozzles are consumables. Clarify spare-part availability, warranty terms and whether the supplier's engineers support commissioning and operator training. A supplier that develops its own cleaning equipment, rather than reselling a catalogue, is normally the party that can answer a spare-parts question about a specific model number.
Run a paid trial on your worst vehicle
Do not accept a demonstration on a showroom van. Pick the dirtiest truck in the fleet and time the job end to end: setup, wash, moving between bays, refilling and cleanup. Record how many vehicles one operator finishes per shift and how much water and detergent the process consumes. Compare that number with your current pressure-wash baseline. If the steam machine does not shorten the total cycle or reduce water and chemical use on your own worst case, no datasheet argument will change the result.
Buyers who need a configuration beyond the published range — different tank volume, mode set, power supply or mounting — should send the bay layout and vehicle mix to an intelligent cleaning equipment manufacturer and ask for a proposed specification. A supplier willing to build for a stated duty is a better procurement risk than one that only ships what is on the shelf.
