Which surfaces on a cooking line are actually in scope
The first question is not about the machine. It is a list. Walk the cooking line in production order and write down every surface the cleaning crew is expected to treat, because "cooking line" means several very different objects. Outer casings of fryers, griddles, grills and ovens. The frame, legs and cross-members underneath them. Range-hood panels, the outer face of grease filters, the front edge of the hood. Trolleys, shelving, guard rails, wall protection. Floor edges and the strip of floor where oil drips from a tap or a leaking valve. Each of these carries a different deposit, and each has a different tolerance for heat and water.
Split that list into two columns. The first is surfaces you can safely stand a lance in front of. The second is surfaces where the cleaning target sits next to something that must not get wet: a control panel, a display, a fan grille, a cable entry, a thermostat housing, a gas valve, a bearing, a lubricated slide. A machine is suitable for a cooking line when the operator can clean everything in column one without touching column two. Ask the supplier how the machine behaves close to an opening — how far the vapour travels, how much moisture leaves the nozzle, and whether the mode can be changed without changing tooling.
What kind of deposit is on the surface
Steam earns its place on one particular deposit type. On a cooking line the deposit is usually airborne cooking oil that has cooled and re-heated many times, bonding with dust, flour and carbonised food particles until it becomes a dark, hard, slightly tacky layer. A cloth and detergent move the fresh splash from this morning. They do not move a layer that has been through several hundred heat cycles.
Test it before buying anything. Press a thumbnail, then a plastic scraper, into a small patch and note whether it dents, lifts in a sheet, or shards. A soft surface film can be handled by ordinary wiping. A half-dry sludge mixed with carbonised particles responds to heat. A fully polymerised crust is the hardest case and should be judged on a trial, not on a brochure. Mineral scale from splashed water, and any crust that has carbonised to a brittle shell, are weaker cases for steam and both belong in the trial set rather than in the assumptions.
Ask one more question here: what does the current method cost per clean, in crew minutes, in downtime, in detergent, and in how often the job has to be repeated. Without that baseline, no comparison afterwards means anything.
How the surface itself reacts to heat and moisture
Suitability is half about the machine and half about the surface. Take the finish off each item on the scope list, because the finish sets the rules. Plain passivated or mill-finish stainless is forgiving. A brushed stainless that has been scratched by steel wool over years holds grease in the scratches, and abrading it further makes the next clean worse — a pad that leaves a polish marks the wrong cleaning medium. Painted, powder-coated or printed panels, nameplates and any decorative trim should be tested in a hidden area first. Check whether any panel edge is welded with an open tube end, whether gaskets around doors and inspection panels are still seated, and whether there is blistering or rust at a weld.
Write the exclusions down as a signed boundary, not as a warning in a manual. Surfaces in scope: outer casings, guard exteriors, hood panels and the outer face of removable filters, frames, legs, shelving, trolleys, floor edges. Out of scope unless the equipment owner approves in writing: bearings and seals, relubrication points, gas valves and their joints, ignition and flame-monitoring parts, temperature probes, electrical enclosures and the inside of junction boxes, control cabinets, displays, thermostats, sensors, cables and their glands, open pipe ends, and any panel that is already leaking, deformed, thin from corrosion or repaired. Then turn that list into an operator rule the crew can follow without reading it twice: the nozzle is never aimed at a panel gap, connector housing, fan grille, bezel or cable entry, and masking goes on before the machine is switched on.
Does the mode suit the job, and can the crew switch it mid-task
A machine that outputs one kind of vapour answers only part of the question. On a cooking line you normally want two behaviour patterns from one unit. Drier vapour carries less free water, so it is the mode to use close to controls, near openings and on anything that must be back in service quickly. Wetter vapour and hot water carry more moisture and more lifting energy, which is what you want on a flat panel at a safe distance, or as a first pass to soak and soften a thick build-up in a recess or on a filter mesh before the finishing pass.
So the question to put to every supplier is not "how hot does it get" on its own. It is: what steam temperature and pressure does this exact configuration deliver, can the machine move between drier and wetter output during the same job, how long does it take to reach working condition from cold, and how long does the unit run before it needs a refill. For a fixed unit in this class, the fixed steam cleaning machine PowerDe HW02 page publishes 220 V working voltage, 6 kW heating power, a steam temperature of 160 °C, 0.8 MPa vapour pressure, an 80 L SUS304 tank, a tap-water inlet with a 4-point internal-tooth joint, and selectable dry steam and wet steam with an integrated vacuum. Those figures describe that model in that configuration and nothing else; runtime, hose and wand lengths, weight, water consumption and noise are not on the page, so they stay as written questions to the supplier. Where product images show display readings that differ from the parameter table, the parameter table is what you ask the supplier to confirm.
One point of honesty belongs in this article. The PowerDe HW02 product page documents its applications as vehicle exterior cleaning at gas stations and parking areas, interior vacuuming and disinfection, and engine-compartment cleaning. Cooking-line surfaces are an adaptation the buyer has to prove on their own surfaces, which is exactly why the trial questions below matter more than the specification sheet.
What the services and the route allow
A machine that suits the deposit still has to be reachable and supported. Fill in these items per cleaning point, not as an average for the whole kitchen.
- Power: the nearest socket or isolator and its voltage, whether that circuit is shared with fryers, ovens, extraction fans or refrigeration at the same time of day, and whether the circuit has headroom, since a heater is a sustained load rather than a short one.
- Water: whether there is an inlet at the point of use and what fitting it has, and where the tank is refilled when there is not one — that walking distance is a real labour line in the quote.
- Run-off: steam loosens soil rather than removing it, so the oily water has to be led somewhere. Drip tray, containment, extraction, a mopping step, and the route to an interceptor or drain all cost time and equipment; washing it straight into the floor drain moves the cost downstream.
- Access: measured door widths, the narrowest aisle, thresholds and any lift, compared with the machine's published footprint including handles. A fixed unit in the class above is listed at 1,200 × 800 × 1,200 mm including handles — measure the route by walking it before accepting that it fits.
- Reach: the working radius is the walking distance from power and water to the furthest surface plus what the hose actually spans. Walk it once and record the number.
Those answers decide the machine class. Where there is stable power and water at a fixed point, a mains-powered fixed unit is the obvious starting point. Where cleaning points are scattered, aisles are tight or cabling across a wet kitchen is unacceptable, the mobile and battery classes come into play. PowerDe lists hand-pushed and driving-style units with dry-steam, wet-steam and hot-water modes, some of them in battery-equipped and battery-free variants; those pages place them in indoor garages and narrow outdoor parking areas and do not publish steam temperature, pressure, battery capacity or runtime. A kitchen is a different environment, so suitability is a question about your own aisle widths, drainage and supply — not an assumption carried across from a model name.
How fast the line has to be back in service
Ask what clean means by the time the crew finishes, and in how many minutes. A cooking line usually allows one of three windows: a few minutes during a quiet stretch of service, the gap between lunch and dinner, or after close. The window decides the method more than the soil does.
Cost the window as four separate numbers, because treating it as one is where plans fail: warm-up from cold, dwell per pass, the number of passes needed to lift the hard layer, and the time to dry and return the equipment to service. The last one is usually the binding constraint on a cooking line. Surfaces in seams, fixings and panel edges hold moisture, and a unit that is closed down wet and put straight back into production is a slow damage mechanism rather than a cleaning result, so a separate drying pass and an open, isolated unit before return to service belong in the procedure. Slip risk on the floor around the equipment is a second downtime cost, and it should be timed, not estimated.
If the honest total exceeds the window, do not look for a more powerful machine. Raise the frequency on small areas instead. Hood panels, filters and the surfaces under a tap can be treated on a short cycle, while a long-accumulated crust is planned as a separate, longer job.
What protects people, and what you must confirm in writing
Ask which protective functions the quoted configuration has, and confirm them against the machine rather than the brochure. The PowerDe product pages name leakage, short-circuit, high-temperature, high-voltage and water-shortage protection, with high-voltage-explosion protection also listed on some pages; the count differs between records, so list the functions for the exact model you are buying instead of assuming a number. In daily use, water-shortage protection is the one crews meet first: the machine stops rather than carrying on dry, and that belongs in the procedure as a refilling step rather than being treated as a fault to reset.
Then ask for four things in writing per quoted model: the steam temperature and pressure range for that configuration; how drier and wetter output are selected and switched; the site supply the machine needs against what your kitchen actually has; and the protection functions fitted on that unit. Add personal protective equipment and an induction record to the same conversation — hot vapour and a hot nozzle are not a housekeeping task, and a supervisor should be able to show who was trained, for which machine, on which surfaces.
The trial that answers the question for your surfaces
Do not trial the easiest surface. Pick three areas that can fail: the heaviest build-up, the most delicate or already repaired finish, and one area right next to something on the exclusion list. Photograph each area from the same angle and distance before starting, then keep the photographs afterwards. Agree the acceptance test before the trial, not after it.
Record five timed variables and one quality variable for each area: warm-up, dwell per pass, passes needed to lift the hard layer, which mode was used, how the run-off was collected, and the minutes to dry and return to service. Then score two things — whether the attachment changed from a hard crust to something that can be wiped, and how much rework was needed. Rework is the hidden cost in any comparison, because every repeated pass carries labour, water and machine time with it.
Run the comparison against your existing baseline in the same units: crew minutes per surface, detergent and water consumed, downtime or reduced service, number of repeats, and the cost of handling grease-laden run-off. If the figures hold, extend the method surface by surface rather than all at once. Where a result is needed in a very short window, on internal ductwork or on parts that are not in any catalogue, that is a configuration question rather than a product choice — PowerDe lists customized steam cleaning equipment and engineering support for factory equipment, pipework, oil deposits and food-industry cleaning, and the useful submission is a set of photographs, the deposit notes, the exclusion list and the measured power, water and access conditions from the sections above.
Questions a competent supplier should be able to answer
- Can drier vapour be used next to a control panel without moving the nozzle further away, and what changes when it is?
- How long from cold to working condition on the configuration you are quoting, and how long does one tank last in continuous use?
- What does the residual moisture leave behind on horizontal frames and in fixings, and what drying step do you expect the customer to perform?
- Which accessories are included, which wear out, and what is the warranty and service position for this model?
- If your product page does not list cooking-line surfaces, what evidence can you show for them, and on what conditions?
The last question is the useful one. A supplier who answers it with a bounded trial on your own three worst surfaces, with your exclusion list agreed in advance, has given a better answer than a specification sheet. Browse the Cleaning Equipment Series to see what each machine class actually publishes, then take the questions above to the supplier with your photographs and measurements attached.
