Water supply is the specification most buyers leave blank when they compare steam cleaning machines. Pressure washers need a hose and a volume of water; high-temperature steam units behave differently, and the difference decides whether the equipment runs at all once it reaches the site. Before a steam-cleaning specification is signed off, six questions should have written answers.
1. What can the site actually deliver to the machine?
Fixed units such as the PowerDe HW02 are designed around a tap-water inlet with a 4-point internal-tooth joint (1/2 inch). That connection assumes mains pressure and a potable supply. Two checks follow. First, static pressure at the tap: if the site runs on a rooftop tank or a booster pump with weak output, filling an 80 L tank becomes a wait rather than a background task, and operators will skip cycles. Second, water quality. Scale is the failure mode in any heated water circuit, so ask what the supply hardness is and whether softening or filtration is required upstream of the inlet. Site utilities, not the brochure, set this answer.
Where there is no fixed water point, mobile units change the trade. Several driving-style models carry their own tank and run on battery power, which moves the constraint from the plumbed line to the refill routine and the charge window.
2. Is the machine fed from a permanent supply or from a carried tank?
Treat this as two operating patterns, not a feature checkbox.
- Permanent supply: the machine runs continuously as long as the shift does. Suited to wash bays, fixed service pits, and any point with a plumbed tap and drainage.
- Carried tank: the machine travels to the job. Suited to car parks, rented bays, and sites where running a hose is not possible. The limiting factor is tank capacity and refill frequency, so count refills per shift against tank size before choosing.
Battery-equipped and battery-free variants of the same model exist for a reason. If a fixed supply and power are available, the battery variant is unnecessary cost. If the machine moves between floors or into narrow parking areas, battery and tank size become the specification.
3. What electrical supply exists, and does the machine match it?
Heating power is the load that matters. A 6 kW heater on a 220 V supply draws enough current that an old socket, a long extension, or a shared circuit will trip or overheat. Before ordering, confirm the available circuit rating, socket type, and cable run to the working position, and compare with the machine's rated working voltage and heating power as published on its detail page. Do not assume three-phase or single-phase compatibility from the product name.
Ask the manufacturer to state protection behaviour for the conditions on your site. The HW02 page lists leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection, and other models list a similar set. Because listings differ in what they include, request the protection list for the specific model in writing rather than inferring it from the series.
4. Which steam mode does the work require: dry, wet, or hot water?
Water volume follows from this decision, so it belongs in the water-supply conversation. Dry steam carries little free water and suits surfaces where a soaked bay, running water, or a long drying time is unacceptable — electrical compartments, equipment housings, floors in live production areas. Wet steam and hot-water modes carry more water and do the mechanical work on heavy soil. A machine that switches between dry and wet steam lets one operator adjust to the surface instead of running two machines.
For engine compartment steam cleaning and vehicle exterior work at a forecourt or car park, the dry/wet switch is where water use and finish quality are decided. For cleaning and disinfecting hospital beds and medical machinery, a hand-pushed high-temperature, high-pressure unit with dry and wet steam modes is the form listed for that duty.
5. Where does the used water go, and how does the machine reach the job?
Steam reduces water use per cycle, but it does not remove the drainage question. On indoor garage floors and in wash bays, confirm that gullies and separators exist and that grease or oil carry-over is acceptable. On outdoor parking areas, run-off is a site-rules issue before it is an equipment issue.
Then walk the route. Overall dimensions, including handles, decide whether a unit passes a doorway, a lift, or a narrow bay. The HW02 is listed at 1,200 × 800 × 1,200 mm including handles; the hand-pushed HMW3 at L1150 × W520 × H1030 mm. Compare both numbers against your narrowest point, and check wheel type against floor surface and any threshold.
6. Who maintains the water path after installation?
Ask which parts contact water and how they are serviced: tank material, heater type, inlet filter, and the descaling interval the manufacturer recommends for your measured hardness. The HW02 page records an 80 L SUS304 tank and a 6 kW heater; the HMW3 page records a 50 L clean water tank and a 4.5 kW PTC semiconductor heater. Ask about the service regime for those components in your water, in writing, before the order.
Some figures are not published for every model — steam temperature and pressure, tank capacity, heater power, and dimensions are stated for some units and not for others. Send your answers to the six questions above with the site's supply and access details, and ask PowerDe to confirm the model, mode set, and any water treatment against those conditions rather than accepting a model chosen from a catalogue page.
Before you sign off
Write down the supply pressure and hardness, the circuit rating and socket position, the tank or plumbed choice, the dry/wet decision per surface, the drainage route, and the access width. Those six answers, not a model name, define the commercial steam cleaning equipment your site can operate. Shenzhen PowerDe Automation Precision Equipment Co., Ltd. builds fixed, hand-pushed, and driving-style steam cleaning machines and can review a site specification against them.
