Deposit type sets the outer edge of what heat can do
The first limit is the soil, not the machine. Loose grease and fresh spillage respond to heat almost immediately. Polymerised oil that has been taken past its smoke point many times behaves differently: it is a hard film bonded to the top plate, and it needs dwell, meaning the heat has to stay on the film long enough to soften it through its thickness. Carbonised residue from a scorched pan is harder still, and a fraction of it will come away only mechanically no matter what is applied. A buyer should expect a supplier to describe these three deposits separately, because an answer that treats all stovetop soil as grease is an answer that has not looked at the surface.
This matters commercially because the dwell requirement, not the headline output of a machine, drives labour time. If the answer to a hard film is a longer pause on each panel, the machine you choose may be the smaller, simpler one and the cost sits in the labour hours spent on the panels. Ask for a trial timed per panel, so and written down per panel so that the labour figure and the equipment figure can be compared honestly.
The surfaces that must stay dry are part of the specification
Every stovetop carries items that must not be wetted: burner valves and their spindles, igniter pins and their leads, gas-cock assemblies, knob stems, thermocouple fittings, the collar around a control shaft, and on electric units the terminal area beneath the glass or the sensor block under a ceramic top. A cleaning plan that does not name these items in advance will wet them in practice, because the operator is following a list rather than a judgement. The limit a buyer should insist on is a written exclusion column for each stovetop type in the kitchen, together with a named alternative for every excluded item, otherwise the exclusion silently becomes an area nobody cleans.
Two further exclusions belong to the equipment rather than to the cleaning method: refractory and insulation material around older ranges, and any painted or printed fascia, decal or vinyl trim. Heat and solvent soften both. Where those materials exist, the honest limit is that steam cannot serve that unit without a workaround, and that is a reason to survey the appliance before requesting a quotation, not after.
Water has to go somewhere, and in a kitchen it is a constraint
Steam is a low-volume process compared with a hose, which is exactly why it is considered in a kitchen. It is not a waterless one. Condensed vapour plus any rinse pass becomes run-off with somewhere to go, and on a cooking line that run-off carries loosened grease. A buyer should establish where that mixture lands before agreeing any method: the sink trap, the grease interceptor, the floor gully, and whether the floor around the range is drained at all. Where the floor does not drain, run-off has to be captured and carried out, which changes the crew, the time and the equipment class.
The related limit is time the kitchen is out of use. A wet stovetop and a wet floor around it cannot be handed back to service at the moment cleaning stops. A quotation that ignores the drying window is incomplete, and the drying window is frequently the number that makes a night-shift plan fail.
Reach decides which machine class is being bought
A stovetop is not one surface. It has a flat deck, the underside of pan supports, the rim of a burner well, the gap under a hinged top, the seam where a splashback meets the deck, and the back edge that is hard to see from the service side. Hose length, wand geometry and how the unit is moved from bay to kitchen decide whether those locations are reached at all. A fixed installation suits a permanent position and a fixed duty; a mobile unit suits a kitchen where the cleaning crew moves and where the machine has to pass a doorway, a service hatch or a step. Read the decision from the kitchen layout, not from the brochure table.
The buying limit here is straightforward: a machine that cannot reach the back edge and the underside of supports has been bought for the visible deck only, and the rest of the labour stays manual. Ask to see the appliance positioned in your own kitchen during a trial before the configuration is fixed.
Figures on a product page belong to that machine, not to your stovetop
Cleaning pages on this site are written around vehicle, parking and equipment duties, so a kitchen reading of the range has to be carried by your own trial rather than by the catalogue text. The same caution applies to every number printed on a product page. Temperature, pressure and output describe the unit on that page under its own supply conditions. A buyer should treat them as the starting point for a written question about the exact machine quoted, and should collect the rows that decide fit for a kitchen: tank capacity and how long it supports continuous work, water supply and inlet arrangement at the point of use, electrical supply available in the kitchen, and the configuration options available for the duty. For the fixed unit on the site, those rows and the dry or wet steam switching are set out on the Fixed Steam Cleaning Machine PowerDe HW02 page; take that page as the record to question, not as a claim about your installation.
The ceiling is set by portability of the figures. A supplier who cannot answer the row list in writing for the machine you are being quoted has not specified anything yet, only a category.
Trial results do not transfer between stovetop types
A successful patch on a flat gas range tells you nothing about a glass-ceramic top, a griddle with a seasoned surface, an older range with cast parts and seams, or a unit whose top lifts off and whose underside has never been cleaned. The limit that buyers most often miss is generalising a good trial across a mixed cooking line. Mark two or three patches with tape, change one variable at a time so the record shows whether heat or dwell did the work, and photograph the panel before and after from the same distance and angle.
Then hold the trial to a stop condition agreed before it starts. If the same pocket resists after the agreed number of passes, the honest conclusion is a mechanical or disassembly fix rather than a bigger machine, and that finding is worth as much as a success because it stops a purchase that would not have solved the problem.
What the method does not cover
Steam on a stovetop exterior does not clean the interior of a burner, a gas passage or a flue, and it does not touch ductwork above the line. It does not remove a limescale crust left by hard water without attention to the water being used, and it does not repair a damaged seal, a lifted edge or corroded sheet; cleaning often reveals those faults, and the site has to decide in advance who owns them. Hygiene and fire obligations on a cooking line remain the site's own responsibilities under its own rules and insurer, and no cleaning machine changes those obligations or the inspection records they require.
Turning the limits into a written decision
A workable shortlist comes from one page per stovetop type: surface and deposit for each location, the named exclusions with their alternatives, the run-off route, the drying window, and the reach items that decide fixed or mobile. Send that page with the row-list questions rather than a description of the problem, so the supplier is specifying against your kitchen. The supplier lists commercial steam cleaning equipment across fixed and mobile classes, and the enquiry route for customized steam cleaning equipment is where the survey and the configuration questions are answered for the exact installation.
