In most kitchens the water figure for cleaning is never written down. The bill arrives, someone glances at it, and the number is filed away. That single omission makes water use impossible to assess, because there is no reference point to compare against after a change in method, crew or machine. Before anything can be reduced, the kitchen needs a number it trusts for the tasks it actually performs — and piping surfaces above the line are a good place to start, because they are easy to overlook, they need no disassembly, and the wrong approach turns a five-minute wipe into an hour of hand scrubbing with a hose running the whole time.
Why piping is a separate line in the cleaning plan
Extractor duct casings and accessible duct sections, the collar and plenum behind the hood, gas and water supply runs, bracing brackets and pipe hangers each carry a different deposit. Accessible duct sections collect airborne grease that condenses on cooler metal. The underside of the hood drips. A gas supply run sitting above a grill sees the same vapour but is usually cleaned last, because nobody can reach it without a ladder and nobody wants to scrub an inverted overhead surface. If a cleaning schedule treats all of these as one line reading "clean overhead pipework — quarterly", that line will be completed inconsistently or skipped entirely.
Piping surfaces also fail an inspection long before the floor or the stovetop does. A hygiene inspector lifts a filter and looks up. A fire risk assessor asks what was last removed from the inside of the duct and when. Neither of them will accept a schedule that says the ductwork is "cleaned regularly" with no dated record against it. Everything below concerns the external surfaces, the hood and the accessible parts of the run; duct interiors need their own access, equipment and method, and sit outside this article.
Step 1: build the piping register before you estimate anything
Walk the kitchen with a tape measure and a notebook, and list every run that falls inside the cleaning scope: length, diameter or cross-section, material, height above the floor, whether it can be reached from a ladder or needs a platform, and whether it is insulated. Note the fixed obstacles — brackets, cable trays, valves, the hood framework — because these determine how long the job takes and how much surface can actually be reached. Insulation jacketing needs its own entry, since the cladding is not the pipe and cannot be cleaned the same way.
Record each run against a photograph. A register of numbers without photographs invites disagreement every quarter, because two people will not remember the same amount of deposit. A dated photograph of the same point on the same run at each clean is what lets the plan show a trend.
Step 2: measure the water a task uses, not the water a kitchen uses
This is where most assessments stop working. A water meter covers the whole site; the kitchen's cooking, dishwashing and hand-washing dominate the reading, so a change in cleaning method is invisible in it. To assess cleaning water you need a task-level figure, and there are three practical ways to get one.
First, use the tank on the machine. On the Fixed Steam Cleaning Machine PowerDe HW02, the specification table records an 80 L tank in SUS304, fed from a tap supply. If a crew fills the tank twice to finish the overhead runs on a kitchen line, the crew used 160 litres, and that is a real number rather than an estimate. The same product page lists a steam temperature of 160°C and a vapour pressure of 0.8 MPa; in practice that matters for water assessment because high-temperature steam carries cleaning energy in vapour, so the liquid sitting on the surface at the end of a pass is a fraction of what a hose leaves behind.
Second, meter the wash point itself. A cheap inline meter on the tap serving the wash point gives a cumulative reading that any shift can log. It costs almost nothing and it removes all argument about which method uses more.
Third, run a timed comparison. Pick one representative run, clean it with the current method, log the volume and the minutes; repeat with the alternative on a comparable run the following week. Two data points will not build a business case, but they will tell you whether the difference is real and worth measuring properly.
Step 3: work out what water is actually doing on the surface
Water on a greasy pipe is doing one of three jobs, and mixing them up wastes both water and labour.
- Softening. Fresh oil and light grease respond to heat and detergent. Polymerised, varnished deposits that have been baked on by repeated cooking cycles do not respond to cold water at any volume. Heat has to go in first.
- Displacement. Once the deposit has been loosened, pressure moves it off the metal. This is where the volume is spent, and it is the part crews overdo — running water over an already clean surface because it feels productive.
- Rinsing. Detergent residue has to come off, particularly where food is exposed below or nearby. This is a small volume if the detergent was dosed correctly, and a large one if it was not.
Where the deposit has polymerised, high-temperature steam is the practical route, because the heat softens the layer before pressure is applied — which is why the water per square metre falls. The HW02 switches between dry steam and wet steam. In practice that means putting heat into the deposit with the drier mode, with very little liquid reaching the surface, then moving to the wetter mode as the rinse once the film has released. A hose does the opposite: it applies volume first, and the volume does the work that the heat should have done.
Step 4: count what sits outside the water figure
The comparison that decides a purchase is rarely water alone. It is the whole task.
Labour usually dominates. Overhead work on a ladder is slow, and scrubbing a horizontal pipe underside with a hand pad is slower still. If steam softens the deposit enough that a single pass and a wipe finish the run, the crew time per run falls even if the crew spends the same minutes on the ladder.
Downtime comes next. A kitchen line that has to close for an hour because the floor is soaked is a real cost, and it is the direct result of how much water lands on the surfaces and the floor around them. Record how long the line is unusable, not just how long the cleaning takes.
Chemicals, disposal and run-off complete the picture. Run-off from a degreasing job has to leave the building through the site's waste route and the grease interceptor; the interceptor needs emptying, and that has a cost that rises with volume. Add the descaling routine where the supply water is hard — scale collects inside a heater and output falls long before the machine fails, which is a maintenance cost, not a water cost, but it belongs in the same record sheet. And water running off an overhead surface has to be caught or controlled before it reaches the line below, which means protection on the equipment and the floor beneath, and more work for the crew.
Step 5: choose the machine from the site, not the catalogue
Access decides the machine more reliably than any specification. The HW02 is a fixed unit, listed at 1,200 mm × 800 mm × 1,200 mm including handles, on 220 V, with a tap-water inlet using a 4-point internal-tooth 1/2 inch joint. That means a water supply and a position near the work. Where the kitchen has a wash point beside the line and the ducting runs above it, a fixed unit keeps the crew from dragging a hose across an aisle. Where several servery areas share one cleaning crew and there is no fixed services point, a mobile unit from the Cleaning Equipment Series may suit the site better even if the per-hour water figure is slightly higher — because the crew spends its time cleaning rather than moving equipment.
Read the protection list on any machine you shortlist. The HW02 product page lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protections, among others. Crews need to know those exist, and also that a machine tripping one of them has to be reported rather than reset repeatedly during a shift. A machine that stops mid-job leaves a run half cleaned and a crew that moves on to the next task — which is a maintenance failure as much as a cleaning one, since the affected run has to be done again.
One caution on model naming: PowerDe's listings use both HW02 and PowerDeHW02 for the same fixed unit, and the vehicle-focused wording on that page does not cover kitchen duty. Where a specification decides a purchase, confirm the model designation and the intended application directly with the manufacturer rather than relying on the page alone.
Step 6: set a re-clean interval from your own data
Once you have water volume, labour time and a dated photograph for each run, the interval between cleans becomes a decision you can make with evidence. Review the photographs at the end of a quarter. Where a run still shows a visible film at the review date, the interval was too long; where a run is clean and the crew spent forty minutes on it, the interval was too short and the water and labour were wasted. Move the interval, not the pressure.
Keep the sheets where an inspector or a fire risk assessor can be shown them alongside the interceptor records. Deep grease deposits on accessible pipework and extract surfaces are a fire issue as much as a hygiene issue, so the record of what was cleaned, when, by what method, and with how much water is worth as much as the clean itself.
Turning the assessment into a specification
Once your register, water figures and intervals exist, they are directly usable as a brief. Shenzhen PowerDe Automation Precision Equipment publishes parameters for each machine in the Cleaning Equipment Series and offers customized steam cleaning equipment against a site's layout and duty cycle. Send the piping register, photographs of the worst deposits and your task-level water and time figures to the contact page, and asks for a configuration and method matched to that kitchen rather than a catalogue page.
