What operating cost means for one mobile steam machine
A steam machine does not arrive with a running-cost sheet. The invoice is one line; the cost of using it is the water it drinks, the power it draws, the consumables it wears through, the labour it takes per task, the time it spends out of service and the room and utility work it needs around it. Those six lines are what a facility has to price, and they are priced from the machine's own behaviour on your duty pattern, not from the brochure.
For a PowerDe PWD01 steam cleaner the behaviour is already stated on the product page, and it drives every line below. The unit is a driving-style mobile active-water machine that offers dry-steam, wet-steam and hot-water modes, and it is positioned for indoor garages and narrow outdoor parking spaces. Two catalogued variants exist, with and without battery. Those facts, plus measured values from your own shifts, are the starting point of the estimate.
Which mode is running decides the water and power lines
Water and power are not one utility bill on this kind of machine; they split by mode. Dry steam carries heat with very little free water, so it is the light draw of the three. Wet steam and hot-water work carry more water to the surface and leave run-off behind, which means collection, disposal and the cleanup that follows.
The published pages for the machine name all three modes but publish no flow rate, no steam temperature, no pressure and no heater rating, so the facility cannot compute consumption from the specification at all. The honest route is to measure it. Fill the tank from the same supply and log how many tanks the shift runs and how many tasks that covers. Put a plug-in meter between the wall and the cord and record kWh per shift. Ask the supplier in writing for the tank volume and the heater rating of the unit being quoted, and use the measured figures to check the answers.
A cost model that only carries numbers from a supplier's datasheet will not survive the first month; a model whose figures came from your own shift will.
Power supply and the battery question
Power cost depends on how the machine is fed. The catalogue records that the machine works from a 48 V battery supply, which means the cord, not the wall, carries the load during the task. That also changes what a charging arrangement costs: where the charging point sits in the building, whether the existing supply handles it, how many shifts one working cycle covers, and whether a second battery or a second shift pattern has to be bought.
Because the machine is catalogued both with and without battery, that is a real cost choice rather than a footnote. The published pages publish no battery capacity and no runtime. So the facility asks two questions in writing for the quoted unit: how long the working cycle lasts under a named duty, and what charging arrangement the supplier is including. Until both are answered, power cost is a range, not a number.
How the garage and parking setting adds to the cost
The environment the pages place this machine in carries cost of its own. An indoor garage gives you power and water at fixed points, so the utility work is done once. Narrow outdoor parking spaces do not. Then the line items are distance, not price: how far the machine is pushed from the supply point to the working face, whether a length of hose and cable has to be pulled and coiled each shift, how run-off is collected when there is no drain under the work, and whether the machine stands in the weather between tasks.
Those distances are labour, so measure them. Walk the route, time it, and multiply by the number of tasks in a shift. The same walk usually shows the difference between two candidate positions for the supply point. A fixed install solves that class of cost by bringing plumbing to one point, and for a garage or yard layout customized steam cleaning equipment is the way that arrangement gets specified rather than bought off a shelf.
Consumables and wear on a driving-style machine
A mobile machine that is pushed over garage floors and threshold ramps wears differently from one that stays parked beside a drain. The published page for this machine records a high-pressure water gun with a nozzle, and that assembly is the consumable to price first: nozzle wear changes the pattern and the flow, and a worn nozzle quietly raises both water and time. Seals, hose and the cord set are the next line, and all of them age with task count rather than with the calendar.
Two cost consequences follow. First, ask the supplier in writing what the service interval is for the nozzle, seals and hose on the unit being quoted, and what those parts cost as a kit. Second, count tasks per shift, not hours, because task count is what those parts are measured against. Water quality belongs on this line too: the catalogue records that the tank takes tap water through a 4-point internal-tooth fitting, so ask in writing whether the hardness at your site is inside what the supplier accepts, since scale is a maintenance cost that shows up a year later.
Downtime, protection and the cost of the machine not running
The most expensive line on an operating-cost sheet is the shift where the machine is not available. That is where protection behaviour becomes money. The product pages describe protective functions of this class of machine, including leakage, short-circuit, high-temperature, high-voltage and water-shortage protection. Those functions cut the odds of a fault, but a protection that trips in the middle of a shift still costs the time it takes to find the cause and clear it. The published pages do not state a protection count, so confirm the set for the quoted unit in writing instead of assuming one.
Then price the recovery. Who fixes it, how fast, and what happens to the tasks that were booked while the machine was down. Ask for response times, the parts that are stocked, and whether a loan unit covers the gap. If the answer is slow, the operating cost of one machine is really the operating cost of one machine plus a standby, and that belongs in the model before the purchase rather than after the first breakdown.
Labour per task is the line to measure first
Labour is usually the largest line and it is the easiest to measure badly. A single stopwatch pass over a tidy task tells you the best case. A better pass is a bounded trial: the same surfaces, the same soil, the same operator, several repetitions, timed from the moment the machine leaves the supply point until it is back and cleaned. That single change captures the walking, the refilling, the hose handling and the run-off cleanup that a stopwatch pass misses, and those are exactly the items the garage and parking setting adds.
Record what the operator did with the mode selection as well, because the mode changes the labour. Dry steam on heat-sensitive work, wet steam or hot water on heavier soil: the same task can run at very different times per square metre. Put the timed figures against the surface area and you have cost per square metre, which is the one number that lets this machine be compared with any other option on the same page.
Trial before the model is closed
Before the model is signed off, run it against something. A bounded comparison is cheap and it settles what a specification cannot: whether the machine clears the soil at the time per square metre the model assumes. Steam cleaning equipment testing is where that kind of check is arranged on the site, with the pass line agreed before the trial starts rather than argued afterwards.
Keep the trial record small and specific: tasks timed, tanks consumed, kWh logged, run-off handled, anything that stopped the work, and the surface area covered. Those seven fields are enough to replace every assumption in the model with a measurement. They are also the record that lets the same comparison be repeated when the next machine or the next site comes up.
What the facility should ask for in writing
The gaps in the published pages are the questions to send before the cost model is closed, for the specific unit being quoted rather than for the range: tank volume and heater rating; steam temperature and pressure by mode; battery capacity, working cycle and the charging arrangement included; the service interval and part prices for nozzle, seals and hose; water hardness the machine accepts; protection functions confirmed for the quoted unit; and response times with stocked parts.
Every one of those answers moves one line on the sheet from a range to a number. Then close the model in the order it was built. Measured water, kWh, run-off handling, tasks per shift and time per square metre from your own shift; supplier answers on everything the pages do not publish; the trial as the pass line. If the machine is expected to serve a layout that changes, price the supply point and the walking distance at the same time, because on a driving-style mobile machine that is where the running cost of a garage or parking site is actually decided.
