A large catering kitchen is not a restaurant kitchen with more covers. It has surfaces a restaurant never builds: a bank of bratt pans bolted to a tiled plinth, a conveyor grill that runs from six in the morning, trolleys that are washed in a bay rather than on a floor, a scullion tunnel whose racks pass hot water all day, and a servery line that is wiped between every service. It also has a maintenance history. A stainless cladding that has been scrubbed twice a day for nine years is a different surface from the one that left the factory, even though the equipment register still calls it the same thing.
When hot water or steam enters that room, the question nobody asks is the one that causes the most expensive afternoon. It is not whether the method removes grease. It is what the heat and the water will do to a finish that has already been thinned by years of cleaning, or to a sealant edge that was patched last spring by whoever was on shift. A compatibility check is the written answer to that question for one surface at a time: what happens here when hot water reaches it, tested on a small area, observed after it dries and again the next morning, and recorded under a name. The list below covers which surfaces need that answer before anyone picks up a lance, what the check actually involves, and what it does not prove.
Why heat changes the risk
Three physical facts sit behind every compatibility problem in a kitchen, and they are worth stating plainly because they explain what to look for.
- Heat softens more than grease. It softens old wax and polish, the adhesive under a price ticket or a safety label, and any finish that has been built up by repeated cleaning rather than stripped.
- Vapour condenses on any surface colder than it is, so the wetted area is always larger than the area you aimed at. A panel you never sprayed still gets wet.
- Run-off follows gravity. It travels into seams, behind control panels, down the front of a plinth and into the floor line, and it arrives at places that were never in the plan.
A compatibility check is those three behaviours observed on your own surfaces, on a small area, before they are observed on the whole servery line. No data sheet performs that observation for you, because a data sheet describes what a generator produces and says nothing about the age of your sealant.
Build the surface list before you sort it
Walk the kitchen with the equipment owner or the engineer who maintains it, and write one line per surface rather than one line per room. A row that says "cooking line" cannot be checked, cannot be protected and cannot be argued about later. A row that says "bratt pan number two, left plinth face, below the tap inlet" can be all three.
For each line record what the surface is made of and how it is finished, when it was installed or last repaired, which parts beside it must stay dry, who owns it, and how it is cleaned today. That last column matters more than it looks. A surface that has been wiped with warm detergent every day for years has a different history from one that has been scrubbed with an abrasive pad, and a surface that was re-tiled or re-sealed last year has a bond that is younger than the equipment around it. Name surfaces by the asset number in your equipment register rather than by a location, so that the cleaning record and the maintenance history speak the same language when something goes wrong later.
Sort the list into three groups
The first group needs no check. These are surfaces whose maker's own cleaning instruction already permits warm-water washing: stainless cladding on kettles and bratt pans, welded stainless tables and sinks, sound ceramic tile with intact grout, dense sealed concrete. The test is not whether the surface looks tough. The test is whether a document you can quote says yes.
The second group needs a check before hot cleaning, and in a catering kitchen it is usually the longest column. It includes any finish nobody can identify, painted or powder-coated panels and frames, plastic-laminated surfaces near edges and joints, old labels and the adhesive beneath them, grout lines and sealant joints, coated or sealed floors, brushed or anodised aluminium, and any place where two different metals meet with a wet path between them. It also includes anything that has already been repaired, because a repair has its own age and its own bond.
The third group stays dry. Burner interiors, gas valves, igniters and flame detection, electrical enclosures, pendant stations, displays and their cable entries, insulation behind a panel that has been damp before, wooden handles, and any part whose instruction says keep it dry. The same appliance appears in all three groups on different faces, which is exactly why the list is written one surface at a time rather than one appliance at a time.
What the check itself involves
A compatibility check is short, and it fails for one reason only: it is judged while the surface is still wet. Run it in this order.
- Write what you would notice as a failure, in observable terms, before anything is wetted, and photograph a fixed reference point from a marked spot so that the after image can be compared honestly.
- Choose a hidden patch of the same surface, use the least aggressive setting you intend to work with, one pass, at a distance, with no scrubbing and no detergent.
- Look three times: when the patch is dry, later the same day, and the next morning.
- Check the gaps with low-angle light and a clean cloth, naming seams, drip edges, drill holes, the plinth line and the underside of a table top rather than trusting the flat face.
- Record one line per surface with the date, the setting used, what was seen at each of the three looks, and the name of the person who looked.
Four failures arrive late rather than at once, and the second and third look exist to catch them. Bare steel or a worn edge can show flash rust hours afterwards. A painted or laminated panel can show water marks or a dull patch only once it has fully dried. The adhesive under an old label can soften and lift at one corner the following morning. And water can appear somewhere it was never aimed, at a seam, under a panel edge or at a cable entry, because it moved as vapour and condensed as liquid. A surface that passed while it was still glistening has not passed.
Catering conditions that raise the number of checks
Five conditions are common in large-scale catering and rare in a small restaurant, and each one adds surfaces to the second group.
- Several shifts a day. The surface has to be dry and back in use before the next production starts, so the check is timed to a real window and the drying time is written down as part of the result.
- Batch cooking. Overflow runs down the front of kettles and bratt pans, into the plinth and along the floor line, so those joints are the surfaces most often asked about and the ones most likely to have old grease sitting under a lifted sealant edge.
- A long service life. A finish maintained daily for years is thin, and its repair history tells you more than the original specification does.
- Repairs and modifications. A replaced tile, a new bead of sealant, a patched floor, a panel fitted on site. Each has its own age and its own bond, so each is a separate line on the list.
- Food contact and non-food contact side by side. A compatibility check answers durability, not hygiene. A food-contact surface carries its own rules and its own verification, and passing a durability check does not move a surface into that category.
These conditions are also why a catering kitchen needs a written surface list rather than a method chosen for a room. In a small kitchen one person can hold the exceptions in their head. In a room with three shifts and forty assets, the exceptions are the job.
What to do with the results
A check that produces no decision is a photo album. Every line ends in one of three outcomes.
- Passed. The surface joins the routine with a method line that names the mode, the working distance and the number of passes, so the next shift does not improvise.
- Failed. The surface gets a different method, usually warm detergent and a shorter cycle, or it goes to the equipment maker with the photographs attached.
- Unclear. The surface is protected, left out of scope, and re-checked at the next planned review rather than argued about at three in the morning.
Keep the register short enough that people fill it in: zone, surface, material and finish, which group, the date of the check, the result, and the method or protection required. That register is also the document you send to an equipment supplier with your questions. A supplier who can see your surfaces can answer something useful about reach, mode and risk. A supplier who is asked whether a machine is suitable for kitchens gets a marketing answer, and a marketing answer has never stopped a floor being stripped. If you are specifying central kitchen degreasing work for a site like this, the surface register is the part of the enquiry that changes the quotation.
What a compatibility check does not prove
Four claims are commonly attached to a passed patch, and none of them belong there.
- It does not prove a hygiene result. A clean-looking patch says nothing about what your own food-safety programme measures.
- It does not cover the inside of a duct, an interceptor, or the oil path inside a fryer. Those belong to a contractor and a different method.
- It does not extend from one patch to a whole area. It covers the surface, the finish and the age you tested, which is why the register records all three.
- It does not change what an equipment maker's manual says. A passed patch never overrides an instruction to keep a part dry.
One boundary deserves repeating because it is where catering kitchens most often get into difficulty. Floor commercial kitchen floor steam cleaning answers a question about the walking surface. It says nothing about what is under the tiles, about the fall to the drain, or about where the run-off goes once it leaves the bay. Drainage and grease separation remain decisions for whoever owns the site's drainage rules, and a successful patch on a floor does not obtain permission for them.
Read the equipment data sheet as part of the check, not instead of it
The listing for the PowerDe HW02 steam cleaner gives 160 degrees Celsius and 0.8 MPa. Those are two readings of one saturated condition rather than two separate capabilities, and the value that reaches the end of a long hose is a different number again, which is why a check is run at the surface and not at the boiler. The same listing gives 6 kW of heating power, an 80 L SUS304 tank, a tap-water inlet and 220 V, and it describes a switch between dry and wet steam. Dry steam carries less free water, so it is the sensible setting to begin a check with, and wet steam is the one that tests whether your drainage and drying arrangements are honest.
That listing names vehicle exteriors at fuelling and parking sites, interior vacuuming and disinfection, and engine compartments. It does not name catering kitchens, so the kitchen question goes to the manufacturer in writing before the first pass rather than after it. Ask, in the same message, for the figures the listing does not publish: hose and lance lengths, warm-up time, how long one tank delivers steam, and how quickly the machine recovers after refilling. Those are the numbers that turn a measured work window into a plan. The protections the listing names guard the machine. They do not judge your circuit, they do not see a wet floor, and they do not stand between an operator and a hot nozzle.
Start with two surfaces, not with the whole kitchen
Do not attempt to check every surface at once. Pick the two that would cost the most to put right, which in most catering kitchens are a coated floor near a scullion exit and the front face of a plinth under a bratt pan, and run the check on both during one real production window. Photograph them, write the pass wording first, look again the next morning, and add the results to the register. Then let the list grow one surface at a time, at each planned review, rather than trying to produce a complete document in a week.
A catering kitchen that works from a checked surface register cleans with fewer surprises than a larger kitchen working from a method chosen for a room. The register is not paperwork added to the job. It is the record of what the job is allowed to touch, and on a site with three shifts and nine years of cleaning history behind it, that record is worth more than any single machine choice. If your list raises questions the published pages cannot answer, send the register itself to the manufacturer through the contact PowerDe page rather than a summary of it. Suppliers answer records and describe products, and the difference between those two replies is usually where a kitchen cleaning programme starts working.
