Two machines carrying the same model name can sit in different places on the same price list. In the PowerDe cleaning range, HMW3 without battery and the battery-included version share a body, a footprint and a tank; the difference is what you have to buy, charge and store on top of them. A buyer comparing the two is therefore not comparing cleaning performance. They are comparing the total footprint the job occupies in the building, and the work rate the crew can hold in a shift. The steps below are the comparison order that produces a defensible choice.
Write down what the two variants actually share
Both HMW3 variants are published as hand-pushed, high-temperature high-pressure machines that switch between dry steam and wet steam, with a 4.5 kW PTC semiconductor heater, a 50 L clean-water tank fed from a tap through a 4-point internal-tooth fitting, a 48 V working supply, and a high-pressure water gun with nozzle. Both list leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. The published machine dimensions are L1150 × W520 × H1030 mm for both. Anything a supplier claims beyond those figures needs a datasheet in your hands, not a sentence in an email.
Measure the footprint at the door and in the corridor, not on the drawing
Take the published envelope to the building with a tape. Walk the route from the store or loading point to the areas you clean, and check the narrowest door, the lift car, the fire-door gap, the corridor turn and any threshold or ramp. A 520 mm width and a 1030 mm height are workable numbers for a standard doorway, but the machine must pass the door it actually has to pass, so measure the leaf clear of the frame and the door hardware, and check the turning space at each corner. Do the same for the storage position. The machine stands where it stands; if the store alcove is shallower than the machine is deep, the footprint question is settled before the price is discussed.
Then add everything the machine does not include. A battery-included delivery arrives as one trolley. A without-battery delivery arrives as one trolley plus whatever you supply for power, and that addition has its own floor area, its own charging position and its own cable route. Measure the footprint of the battery you intend to use, its charger and the wall outlet or distribution point they need. Where the without-battery machine goes, that extra floor space goes with it, and it usually needs a ventilated, supervised position.
What a 50 L tank means for your job pattern
Capacity in this class is a clean-water tank, not a cleaning-power figure, and 50 L sets the rhythm of the workday. Before you buy, estimate how much of your own work one fill covers, and count how far the machine has to be pushed or how many times the hose has to be moved to reach a tap for refilling and for the water inlet. On a hospital ward or in a care area, a refill trip mid-round is a disruption to the crew and to the patients around them, and it is the kind of thing that quietly lengthens a task.
Also write down the utility basis at the point of use, because it is part of the practical footprint: where the nearest 48 V supply arrangement sits, whether the water inlet can be connected to a tap at that point, and whether the inlet thread on the fitting matches your supply. Ask the supplier to state the fitting size in writing. If a site needs a long run without a stop, and one tank does not cover it, then the machine's capacity is a scheduling constraint you will live with every day, and that constraint belongs in the comparison.
Measure capacity as work per hour on your own tasks
Neither HMW3 page publishes steam temperature, steam pressure, battery capacity, run time or water consumption, so do not let anyone substitute a catalogue claim for a measurement. Run the machine on the tasks you actually have, and time a small set of them: a hospital bed frame end to end, including the rails, the wheel castors and the frame underside; the external wipe-down of one item of medical machinery; and one stretch of ward floor or one room of hard surface. Record nozzle-on-work time separately from total job time, which includes the heat-up wait, refilling, the drying pass and moving between rooms.
Then divide by area or by item and compare against what your crew does today. If the crew currently finishes a ward round in a given window, the question is not whether steam is more effective in the abstract, it is whether dry steam and wet steam, at the dwell and pass order your crew can hold, let the round finish inside the same window without a second trip for water. That measured figure, not a specification line, is the capacity number that should drive the purchase.
Decide the battery question by your route, not by the price line
A without-battery machine is one machine, and a 48 V supply arrangement is another object that has to be sourced, kept charged, and accounted for. If your crew works in one building, on one floor, with a charging position near the store and a supervisor who owns the equipment, that is a manageable addition and it often leaves you free to swap or upgrade the battery independently of the machine. If the crew works across floors, through lifts, at several sites, or in shifts run by different people, a separate battery becomes an inventory item that walks off, goes flat, or gets left behind, and the without-battery price advantage disappears quickly.
Ask the supplier in writing to confirm, for each variant: the battery or supply arrangement included, the charger output, the expected run time on a full charge at the duty you measured in the timed-task section, the weight of the machine as delivered, the hose and wand lengths, the accessory list, and the noise level. Those are the fields the published pages do not carry, and they are the fields that decide whether the footprint and capacity comparison holds in your building.
Check the fit against the wider range before you sign
The footprint and capacity comparison can rule out a model rather than confirm one. A hand-pushed machine that must be walked along a long corridor, or a 50 L tank that cannot cover a large open area, may point you to a different format in the same cleaning equipment series. PowerDe also lists medical equipment steam cleaning among the applications of this class of machine, and presents itself as an intelligent cleaning equipment manufacturer with customised configuration and engineering services, so a mismatch between the standard model and your route is a question to raise, not a reason to abandon the method.
What to send with the enquiry
Send the measured route with the narrowest door and the lift car dimensions, the storage position, the water inlet point and the 48 V supply position, the timed tasks with their results, the run time per shift the machine must hold without a stop, and the current method you are comparing against. State plainly whether you want the machine delivered with or without the battery, and ask for the missing specification fields to be completed in writing. PowerDe can be reached at sales@powerde.net or on +86 13023198376.
