1. What is the boiler outlet, and how does the accessory connect to it?
Before any accessory category, get the connection interface in writing: thread type, thread size, and whether the joint is sealed with a washer, a cone seat, or thread sealant. Steam fittings that look identical in a catalogue can differ in seat angle, and a wrong seat shows up as a leak at temperature rather than at room pressure. The mobile PowerDe cleaning equipment line is supplied with the hose, gun, and lance set that matches the machine's working pressure, so confirm the interface of your existing tools first, then order only accessories that use the same interface.
2. Which of the machine's modes will the accessory actually be used in?
The PWD01 and PWD02 are listed with three modes: dry steam, wet steam, and hot water. Each mode puts different demands on an accessory. Dry steam needs insulation on any handle the operator holds, because there is little water carrying the heat away and the metal runs hot. Wet steam and hot water put volume behind the heat, so nozzle orifice size controls how much water reaches the surface. An accessory specified for one mode but used in another is a common source of complaint. State the mode next to each part on your purchase order.
3. What surfaces and clearances will the operator reach?
These machines are positioned for indoor garages and narrow outdoor parking spaces, which means the work is close-quarters: door jambs, wheel arches, sills, engine bay edges, and the underside of body panels. That drives accessory selection more than any marketing claim does. Extended lances and angled nozzles matter where a straight lance cannot enter. A rotary brush head matters on painted panels where a bare steam jet would be too aggressive. A flat floor tool is of little use in a garage bay, so do not order one unless the site also has open floor area.
4. How long does the supply line need to be, and what does that cost in pressure?
Measure the drive-up distance from where the machine parks to the farthest point the operator cleans, then add working slack. Hose length is not free: longer runs lose heat and pressure at the nozzle, and condensate forms earlier in a long line. Ask for the hose length the manufacturer supplies as standard, and ask what the recommended maximum is for that boiler. If the layout of your site exceeds it, the answer is usually to reposition the machine, not to buy an extra-long hose.
5. Which parts wear out, and how are they replaced?
Nozzles, seals, gun triggers, hoses, and brush bristles are consumables. Ask the supplier which of these are stocked as spare parts, the part number format, and the lead time. On battery-equipped variants of these mobile units, the manufacturer's pages also list leakage, short-circuit, high-temperature, high-voltage, and water-shortage protection; that protection logic is worth asking about, because an accessory that changes the flow path, such as a non-standard nozzle, can affect how the machine behaves under load. Order consumables for a defined service interval rather than replacing them only after failure.
6. Is the accessory being sold for this model, or for the product family?
Model-specific fit is the single most important line on the quotation. The PowerDe PWD02 steam cleaner, the PWD01, and the HMW2 are each offered with and without a battery, and they share the same three modes but not necessarily the same fittings. Ask the supplier to confirm the part number against the exact model and serial range. If you are running a mixed fleet, keep an accessory matrix per model, and do not let operators borrow tools across machines.
7. What does the site's water supply change about the accessory set?
These units take tap water through a fitting specified on the product page. If your bay has no nearby tap, the accessory list grows to include transfer pumps or a refill strategy, and that decision belongs with the machine supplier, not with a generic tool vendor. Hard water also changes the picture: scale accumulates in boilers, hoses, and nozzles, so plan for a water treatment approach and for nozzle replacement as a routine cost.
8. What will you do with the run-off?
Steam and hot water cleaning use far less water than a hose, but the run-off still carries oil, grease, and road grime to the floor. In an indoor garage, drainage and containment are a site requirement, and accessories such as absorbent booms, drip trays, and a vacuum tool belong in the order if your bay has no drain. Check what your site rules require before you specify the machine, not after.
A practical way to build the list
Write down eight answers: connection interface, mode per accessory, reach and clearance, hose length, wear parts and lead time, model-specific part numbers, water supply at the bay, and run-off handling. Those eight answers, taken from a walk-through of your own site, produce an accessory list that fits the machine and the work. Vendors who cannot answer them are selling tools, not a system.
Where to take the specification
PowerDe manufactures these mobile steam cleaning machines in Shenzhen and lists engineering services covering product development and hardware testing, so a buyer who needs a different nozzle set, a longer line, or a layout that matches a specific garage can raise it as an application question. Send your eight answers with the site photos, and ask the engineering team to confirm the accessory set against the exact model before the order is placed.
