Start with the workload, not with the machine
Write down the surface list before you open a single product page. The HMW3 pages describe cleaning and disinfecting hospital beds and medical machinery, and the machine is pushed by hand rather than driven. That combination already narrows the field: a unit that has to fit through a ward doorway and stop beside a bed frame has different constraints from a machine roaming a parking lot.
Then fix the boundary conditions. Where is the nearest water inlet? What voltage is available at the outlet? How far does the operator walk between the machine and the work face? Those answers decide the power architecture long before any brand comparison begins.
Row one: what powers the 4.5 kW heater
This is the row that separates the three HMW3 variants, and it is the one most buyers under-scope. Both battery versions list a 48 V battery as the working power supply, with a 4.5 kW heating load and a PTC semiconductor heater. A 4.5 kW continuous draw on a 48 V battery is a serious discharge duty, so the battery specification is not an accessory detail — it sets how long a shift runs before the pack needs charging or swapping.
The 220 V Fixed Steam Cleaning Machine PowerDe HW03 answers the same load from a mains supply instead. It drops the battery question entirely and replaces it with an installation question: is a suitable 220 V circuit available at the point of use, and who signs off the protection devices around it?
| Variant | Working power supply | What the buyer must confirm |
|---|---|---|
| HMW3 with battery | 48 V battery supplied | Capacity, runtime, charger, spare-pack policy |
| HMW3 without battery | 48 V battery, not included | Who sources the pack, and against which duty cycle |
| HW03 (220 V) | 220 V mains | Circuit capacity, socket location, cable routing |
The without-battery listing is not a cheaper version of the same decision; it is a different procurement decision. Someone still has to specify, buy and maintain the 48 V pack, and that responsibility has to sit with a named party in the order. If your team already runs a battery pool for other floor equipment, that pool has to be matched to a 4.5 kW heating load, not merely to a voltage label.
Rows two to five: what the HMW3 pages publish
Once the power row is settled, the published numbers do line up across the three variants, which makes the remaining rows quick to check:
- Footprint: 1150 mm long × 520 mm wide × 1030 mm high, hand-pushed. Measure the narrowest doorway, lift and corridor on the route, and add clearance for the operator, not just for the cabinet.
- Water: a 50 L clean-water tank with a tap-water inlet on a 4-point internal-tooth joint. Confirm the inlet point and the hose run before the machine is placed.
- Cleaning method: high-pressure water gun with a nozzle, switching between dry steam and wet steam. Dry and wet steam are not interchangeable settings — one suits loosening deposits on hard surfaces, the other suits rinsing.
- Heating: 4.5 kW with a PTC semiconductor heater, described as safe and reliable in operation.
Put a footprint on paper at scale and walk it. In a ward, a service corridor or a plant room, a 1150 mm machine that cannot reach the work face is out regardless of how well it cleans when it can.
Rows six and seven: safety design and the gaps in the sheet
The HMW3 pages list leakage protection, short-circuit protection, high-temperature protection, high-voltage protection, water-shortage protection and high-voltage explosion protection. For a machine that combines heated water, electrical energy and staff working in occupied buildings, treat that list as a compliance review item. Bring your own electrical safety requirements to the conversation and ask how each protection is verified at commissioning, rather than accepting the wording as it stands.
Now write down what the pages do not publish. For the HMW3 there is no stated steam temperature, no steam pressure, no battery capacity, no runtime, no charger output, no weight, no hose or wand length, no accessory list, and no water consumption figure. A comparison that compares only published fields will therefore rate all three variants as identical — which is the trap. Request the missing rows in writing, and hold every supplier to the same list.
Where the wider range changes the answer
Two other PowerDe machines make the trade-off clearer, because they change the mode set rather than the power source. The driving style HMW2 adds hot water to dry and wet steam and runs on a customer-supplied 48 V battery, described for indoor garages and narrow parking spaces. The 220 V Fixed Steam Cleaning Machine PowerDe HW02 publishes 160° steam temperature and 0.8 MPa vapour pressure on a 6 kW heater with an 80 L SUS304 tank.
Those published figures belong to HW02, not to the HMW3, and they should not be transferred across models. They matter here for a narrower reason: they show what a complete specification sheet looks like, and they give you a template for the rows to demand for every battery model you evaluate.
A comparison grid that is actually useful
Build the grid with these columns filled from supplier responses, not from marketing copy: heater power and heater type; power source and, for a battery model, capacity, runtime and charger; steam temperature and pressure; tank volume and material; inlet connection and hose length; machine dimensions against your measured clearances; the protection list and how each item is tested; what is included in the delivery; and warranty terms plus service response.
Then score only the rows your workload actually depends on. A fleet washing a forecourt cares about pressure and temperature. A hospital cleaning team cares about doorway clearance and whether the battery will last a shift. Both are buying from the same product family.
Questions to send before you shortlist
- For the 48 V battery model: what is the pack capacity, what runtime does it give at 4.5 kW heating, and what charger and charge time come with it?
- If we take the without-battery variant, which packs do you recommend, and what interface and connector must they meet?
- What steam temperature and pressure does the HMW3 deliver in dry-steam and wet-steam mode?
- Which accessories are included, and which are priced separately?
- What commissioning checks do you run to confirm each protection function on delivery?
Send the same five questions to every supplier. A vendor who answers all five with numbers has a machine you can plan around; one who answers with adjectives has not earned the comparison yet.
Bringing it together
A product comparison of a battery model is really two comparisons stacked on one sheet: the electrical architecture, and the physical machine in the building where it will work. Settle the power source first, because it decides whether you are buying a battery duty cycle or an electrical installation. Then measure your doorways and corridors against the published footprint, and send the missing rows — battery capacity, runtime, steam temperature and pressure — to every supplier on the list. If you want to test that structure against real cleaning equipment, contact Shenzhen PowerDe Automation Precision Equipment with your surface list and site constraints, and ask for the specification rows above in writing.
