Start With the Duty Cycle, Not the Catalog
Before comparing specifications, define what the machine must do in one shift. Cleaning a vehicle exterior between customers is a short, frequent job with light soil. Stripping hardened grease from an engine compartment or a machine-tool cover is a slower job with heavy soil, and it needs the steam to stay hot long enough to soften deposits. Duty cycle changes the ranking of specifications. A unit with moderate pressure can outperform a higher-pressure unit if it holds temperature continuously, while a high-output machine with a small tank can stall in the middle of a busy route.
Write down three facts before you ask suppliers for a quote: how many cleaning tasks per day, how many minutes of continuous steam per task, and where the machine gets water and power. That short list converts marketing language into a purchasing checklist.
How to Compare Steam Pressure
Pressure is the force that pushes steam out of the nozzle. It affects how well the jet reaches into a gap, how quickly it covers a flat panel, and how much operator effort is needed to break up bonded soil. In PowerDe’s published specifications, the fixed HW02 steam cleaning machine is rated at 0.8 MPa vapor pressure. That figure belongs to a 220 V machine equipped with a water gun and nozzle, aimed at continuous work in one location.
For comparison, ask suppliers for three pressure details that are often left out of marketing pages:
- The rated pressure at the boiler, not at the nozzle, so numbers from different suppliers are comparable.
- Whether the pressure is continuous or a peak, and whether it is maintained while the trigger is held.
- The nozzle set supplied with the machine, since the nozzle shape changes the effect of the same pressure.
Higher pressure is not automatically better. On painted bodywork, on seals, and on wiring, force that is too high damages what you are trying to clean. Match pressure to the surface first, then look for a machine that holds it steady.
How to Compare Steam Temperature
Temperature does the work that pressure starts. Heat softens grease, oil and food residue so they can be lifted rather than scraped. The PowerDe HW02 detail page states a steam temperature of 160°. In a purchase comparison, record that figure alongside a second question: how hot is the steam at the nozzle tip after the hose, wand and fittings? Hose length and ambient temperature both reduce what actually reaches the surface, and cold, windy outdoor bays lose more heat than an indoor garage.
This is also where dry steam and wet steam modes matter. Dry steam carries less water, so it puts heat on the surface with limited runoff, which suits engine compartments, electrical areas and floors that must stay workable. Wet steam carries more water, which helps flush softened residue away from a surface. If a supplier lists both modes, as PowerDe does across its cleaning range, check whether the mode is selectable at the machine or requires a change of attachment, and how long the switch takes.
How to Compare Heating Power
Heating power decides whether a machine can keep producing steam at the rate you need. The HW02 is listed at 6 kW of heating power. A hand-pushed unit such as the PowerDe HMW3 is listed with 4.5 kW of heating power and a PTC semiconductor heater. The two ratings describe different jobs, so compare them against your shift, not against each other.
Three practical checks on heating power:
- Site power. The HW02 works on a 220 V supply. Confirm that your bays, docks or forecourt distribution can carry the machine at full output, and where the cable run reaches.
- Recovery time. Ask how long the machine takes to return to working temperature after each pause, since downtime between jobs sets real throughput.
- Protection. PowerDe’s product pages describe leakage, short-circuit, high-temperature, high-voltage and water-shortage protection, plus high-voltage-explosion protection on the HW02. Ask for the same list for any competing machine, since safety features decide whether the unit can run unattended between tasks.
How to Compare Tank Capacity
Tank capacity is the difference between a machine that finishes a shift and one that needs a mid-shift refill. The HW02 carries an 80 L tank in SUS304 stainless steel, with a tap-water inlet using a 4-point internal-tooth joint (1/2 inch). The hand-pushed HMW3 lists a 50 L clean water tank. Those volumes set the working window, and they also tell you how much water your site has to supply.
Compare tank capacity in the same units from every supplier, and ask whether the figure is the clean water tank or the total boiler volume. Then match it to your water source. A fixed machine that connects to a tap can refill as it works, which reduces the value of a larger tank. A mobile machine carried between bays cannot, which raises it. Steam cleaning is often chosen precisely because it uses far less water than a hose, so plan the water supply as part of the layout rather than treating it as an afterthought.
Mobility Changes Every Other Number
Pressure, temperature and power only matter if the machine reaches the work. PowerDe splits its cleaning range into fixed, hand-pushed and driving-style machines, and that split is the fastest way to narrow the field.
A fixed machine such as the HW02 suits one location with a stable power and water supply. The product page places it in vehicle exterior cleaning at gas stations and parking lots, interior work with a vacuum function, and engine-compartment cleaning. Machine dimensions are listed at 1,200 × 800 × 1,200 mm including handles, so check door widths and bay layout before ordering.
A hand-pushed machine covers multiple bays inside one building. The HMW3 moves by hand push and runs on a 48 V battery, with dry-steam and wet-steam modes; PowerDe’s listing places it in cleaning and disinfecting work on hospital beds and medical machinery, where a cordless machine is easier to move around patients and equipment.
A driving-style machine covers distance between vehicles and buildings. The PWD01, PWD02 and HMW2 mobile units combine dry steam, wet steam and hot water, and PowerDe’s descriptions position them for indoor garages and narrow outdoor parking spaces, where walking a long hose is slower than driving the machine to the bay. Both battery-equipped and battery-free variants are listed, which is worth confirming for your own fleet: a battery variant buys freedom from a cord at the cost of charge management, and a corded variant removes that constraint where supply is available.
Build Your Own Comparison Sheet
Put the same six columns next to every model you consider: rated pressure and where it is measured, steam temperature, heating power and supply voltage, tank volume and inlet type, mobility and power source, and the protection package. Then add one column of your own: tasks per shift and minutes of continuous steam per task. That last column is the only one that describes your site, and it is what lets you reject a specification that looks impressive but does not fit the work.
Two details on the product page are worth requesting in writing before any purchase, because PowerDe’s own listings note that they are not published for some models: runtime on a battery charge, and the accessory set supplied with the machine. Ask for both, together with the service and spare-parts terms, so you are comparing machines on what they will do over years of use rather than on a single datasheet line.
