Ask three suppliers what steam pressure and temperature you need and you will get three different numbers. That is not deception; it is the honest consequence of a question that cannot be answered from a catalogue. Steam does not clean because a gauge reads a high figure. It cleans because enough heat reaches the soil, at the right water content, delivered through a nozzle at a distance and speed an operator can repeat. A competent supplier does not hand you a setting. They run a method that produces the setting, and they write down the evidence behind it. This article sets out that method, and what you should require at each step before you sign anything.
Pressure and temperature are two different controls
Buyers are often sold one number, usually the higher one. Treat the two variables separately, because they do different jobs and they fail in different ways.
Temperature is the energy that reaches the surface. Grease and cutting fluid soften and lose viscosity as the film warms; the work of lifting them falls sharply once the soil itself is hot. The figure that matters for cleaning is not the reading inside a boiler. It is the temperature of what leaves the nozzle and lands on your part, which is always lower than the generator reading once the steam has crossed an open gap.
Pressure does two other things. It drives the flow through the nozzle, which sets how much steam arrives per second, and it shapes the jet, which sets how far that energy still works at a useful distance. Raising pressure without changing anything else can buy reach, and it can also blast liquid and loosened soil into seams, wiring, bearings and gaps you did not intend to wet.
The third control is the one most conversations skip: how much water is carried with the heat. The same generator temperature can produce a nearly dry vapour that deposits heat with very little liquid, or a wetter jet that floods the surface. On a machine bed, on an electrical enclosure, or on a paint finish, that difference decides whether the method is usable at all. This is why a supplier who answers with one pressure number has not yet answered your question.
What a supplier must know before they can pick anything
Any industrial steam cleaning equipment discussion should start with a short factual brief from your side. Six items, and the list is short on purpose.
One: the soil, by name. Cutting fluid, way-oil, graphite lubricant, adhesive residue, food fat, road grime. These are not interchangeable, and a dried binder behaves nothing like a wet film.
Two: the surface and the materials beside it. Substrate, coatings, seals, gaskets, open electrical parts, bearings, anything with a gap. A setting that is safe on bare steel can be wrong on anodised aluminium, on aged seals, or on a painted panel.
Three: the geometry and how exposed it is. Flat plate, machined deck, ribbed housing, open frame, an enclosure with cable entries. Geometry decides nozzle choice far more than pressure does.
Four: the utility you actually have. Supply voltage and the fused capacity at the point of use, single or three phase, whether the machine sits on a fixed feeder or moves around the hall. A 6 kW heater element on a 220 V circuit is a real constraint, not a brochure line.
Five: the feed water. Tap water in many regions leaves scale inside a generator over time, which changes performance long before anything breaks. A supplier who asks about hardness is thinking about your second year, not only your first invoice.
Six: the pattern of use. One deep clean per month, or a wash station running every shift. Duty cycle decides tank size, heating capacity, and whether a fixed installation or a mobile machine is the rational choice.
How a serious supplier turns that brief into settings
A good supplier will not quote settings from the brief alone. They will use the brief to rule out unsuitable machines, then run a trial, because trial results transfer to a site and catalogue claims do not.
The first screening question is mode. If your process cannot tolerate liquid, the answer is a low-moisture setting and a narrower nozzle. If you need to flush soil away rather than lift it, a hotter wetter jet does the work and a drying pass is added afterwards. The right answer is usually a sequence, not one mode.
The second is the nozzle. Round jets concentrate energy on a line, flat jets spread it over a face, and rotating heads trade impact for coverage. Ask the supplier which nozzle they propose for your geometry and why. A supplier who never discusses nozzles is guessing.
The third is the trial itself. Send your own worst part, not a coupon they already have. The supplier's own test panel is a demonstration of their machine; your part is a test of your process. A supplier who refuses to test a customer sample has no evidence to offer you.
What you should ask to see from that trial is not a video. Ask for the frozen parameter set behind the video: mode selected, nozzle fitted, working pressure at the machine, generator temperature, nozzle-to-surface distance, traverse speed, number of passes, dwell time on the stubborn area, and the dilution and dose of any detergent used. If the trial worked, every one of those values is a number, and you should own them.
What the numbers on a fixed machine actually mean for you
Take our fixed PowerDe HW02 steam cleaner as a worked example of how to read a data sheet honestly. The published parameters include 220 V working voltage, 6 kW heating power, a generator steam temperature of 160 C, a vapour pressure of 0.8 MPa, an 80 L SUS304 tank, and a tap-water inlet with a 1/2 inch 4-point internal-tooth fitting, in a cabinet of 1,200 by 800 by 1,200 mm including handles.
Read those as limits and requirements, not as a recipe. The 160 C figure is a generator temperature. The temperature reaching your part depends on nozzle choice, distance and how fast the wand moves, which is exactly the part a supplier configures with you. The 0.8 MPa figure is a working pressure at the machine, not the pressure your surface experiences. The 6 kW and 220 V pair is the supply you must confirm at your own panel before the machine can run as intended, and the 80 L tank tells you how continuously it can run before a refill. The inlet fitting tells you what plumbing the site must provide.
The same reading habit applies to a mobile machine, where the mode choice is often wider. Driving-style units in our range are listed with dry steam, wet steam and hot water modes, which means one machine can be set for a moisture-sensitive pass and then re-set for a flush, instead of being locked into a single behaviour. That flexibility is only useful if someone has told you which mode for which surface, and that is a configuration conversation, not a purchase.
The site survey a supplier should perform
Configuration does not end at the machine. Before the parameters are frozen, a supplier who has done this before will check the conditions that decide whether the settings survive contact with your floor.
Electrical: the voltage available where the work is actually done, the protection device rating, cable length and routing, and whether the operator will be pulling a long lead across an aisle. Water: the supply point, the hardness, and whether treated water is practical. Drainage and extraction: where the displaced soil and run-off go, and whether the room can clear the vapour load.
Access and clearances: door widths, turning space, and the fixed structure around the machine if it is a cabinet unit rather than a mobile one. Then the human questions, which decide more failures than the technical ones. Who holds the wand and for how long, what gloves and footwear they are issued, and what they are told to isolate before washing. A crew that has never held a steam lance will destroy a seal in the first week with a pressure setting that was perfectly correct for the soil.
Insisting on a handover you can prove
A configuration has only been delivered when it exists on paper that your people control. Ask for one sheet containing the mode, the nozzle, the machine pressure, the generator temperature, the distance, the traverse speed, the number of passes, the dwell, the detergent dilution, the PPE, and the isolation steps. Then add a pass rule you can check with your own eyes: a marked test area cleaned in the agreed number of passes, with no liquid driven into a listed set of protected features.
Write the acceptance test before delivery, not after the machine arrives. State that the trial parameters will be re-run on your own part, at your own site, on your own supply, and that sign-off follows that test. If the numbers hold at your site, you have a validated process and a supplier who configured it. If they do not hold, the difference tells you what to change, and a supplier worth buying from will adjust the settings rather than argue about the brochure.
That is what you are actually buying when you ask a supplier to set pressure and temperature: not a higher number, but a set of parameters that someone has tested on your soil, documented in terms your operators can follow, and defended at your own site. Our engineering team handles this kind of customized cleaning setup, including sample trials and site conditions, and the PowerDe contact page is where to send the six-item brief. Send the soil, the surface, the geometry, the supply, the water and the duty cycle, and the configuration conversation can start on facts.
