Ask a kitchen manager how much water the grill line uses and you will get a guess, because water use is rarely metered — it is inferred from the method. That is the first thing to fix. Steam is described as using far less water than a hose, and on a grill line it often does: baked-on fat releases with heat rather than with volume and scrubbing. But whether it saves water on your kitchen is a measurement, not a claim, and the measurement is cheap enough that no operator should have to argue about it. The method below can be set up in a week with a notebook, the site water meter and the unit's own tank.
Measure per job, not per machine
A nameplate tank capacity tells you nothing useful about consumption. What the water meter sees is refills, so record the process instead:
- Ask the supplier for the tank volume of the unit as supplied, and record the fill level at the start and end of every job.
- Count every refill during the job, including the top-ups operators do "just in case", which are usually the largest hidden quantity.
- Add the rinsing and wiping step in the same column. A job that uses a small amount of steam and then three buckets of rinse water is not a low-water process, and the buckets are the part that repeats every day.
- State the work in surfaces — grill plates, flat-top, splashbacks, hood panels, frames, floor directly in front of the line — so the figure can be expressed per surface and per shift.
- Keep the record in one place for a full month, including the days the machine was not used.
Build the comparison against the method you use today
Water use only has meaning relative to an alternative. Most grill lines are cleaned one of three ways: a pressure washer or hose, buckets and detergent with hand wiping, or parts soaked in a sink overnight. Do the same count for whichever method is current:
- Take the site water meter on a normal cleaning day and on a day the grill line is not cleaned. That single pair of readings answers the question better than any specification sheet.
- If the current method is manual, count bucket volumes by their actual capacity, not by how full operators fill them.
- If it is a pressure washer, note that a low flow rate applied for a long time can still deliver a large total volume, which is why the meter comparison beats a flow-rate figure.
- Record the other cost that changes with the method: labour minutes on the line, and the time the grill is out of service.
- Record the finish as well as the water — how the surface looks, whether grease residue remains, whether the floor is wet afterwards. Fewer litres achieved with a poorer result is not a saving.
Where the comparison favours steam, the saving usually shows up outside the water figure too: less standing water on the floor, shorter drying, fewer wet-floor incidents, and a smaller volume of greasy run-off to manage. Those are worth writing in the same report, because they are what a head office or an insurer reads.
Water quality and run-off belong in the figure
Reducing the volume only works if the water that is used suits both the machine and the building:
- Ask the supplier in writing what water quality the unit requires and whether filtration or softening is recommended on your supply. Scale is a maintenance cost that appears as a failed heating element or a blockage, not as a line on the invoice.
- Confirm where the unit is filled and how far that point is from the grill line. Carrying water across a kitchen converts a saving in litres into lost labour time.
- Confirm where the run-off goes. Grease released from a grill line must reach a grease trap or the drainage route your water authority expects, never a surface-water drain.
- Measure the discharge as well as the input. A lower input that produces the same greasy discharge has not solved the drainage problem, it has only moved the water.
Confirm the site can support the method before measuring it
A measurement programme fails if the equipment cannot be used when the kitchen is available. Before the first record:
- Get the working voltage, current and any circuit requirement from the supplier as a specification your electrician can read, and check it against the circuit nearest the line.
- If a battery-powered commercial steam cleaning machine is offered, ask for charge time and runtime per charge and compare both with your cleaning window. A unit that cannot finish the line on one charge will be blamed regardless of its water use.
- Walk the route from store to line with a tape measure: door widths, thresholds, changes of level, and clearance with the tank full.
- Agree a window when the line is cold, the kitchen is clear of food and staff, and hot surfaces can be left to cool afterwards.
Keep steam off parts of the grill that are not rated for it
Any water saving is worthless if the appliance is damaged, so the exclusion list must be settled with the appliance manufacturer before the first clean:
- Electrical assemblies: ignition modules, thermostats, control panels, switches, light fittings and fan motors.
- Painted, powder-coated or laminated panels, fascia strips and glued trim, where heat lifts edges.
- Insulation, gaskets, seals and bearings, which heat and pressure can drive apart so that they fail quietly months later.
- Flooring near the line: vinyl seams, loose tile, and adhesive that has already begun to release.
Ask the appliance manufacturer for written approval for steam, per appliance, and keep it on file. If a grill fails after a steam programme begins, that document is what settles the question of responsibility.
Train the people who will hold the lance
Water consumption is decided by technique as much as by the machine, and untrained operators use water to feel safe:
- Show the difference between dry steam, which carries heat with little free water and suits panels, frames and electrics-adjacent surfaces, and wet steam, which carries more water and suits heavy baked-on grease.
- Set a nozzle distance and a continuous sweeping movement rather than a stationary pass, with a test pass on a hidden area of the same surface first.
- Work from the top of the line downwards, so loosened grease runs onto surfaces that have not yet been done.
- Ask the supplier to confirm which protection features the unit you are buying has — leakage, short-circuit, high-temperature, high-voltage and water-shortage protection are commonly listed in this class — and show operators how each one presents when it trips.
- Define who inspects the result and how it is recorded, since grease on a grill line and its extraction path is a fire question as well as a hygiene one.
Review the month, then change the specification if needed
After a month of records you will have three numbers: the volume per grill line and shift under steam, the volume under the previous method, and the time and finish quality for each. That is enough to make the decision on evidence, and enough to answer a water authority, an insurer or a head office when the cleaning method is reviewed. If the result is good but your power, water or drainage does not match a standard configuration, change the specification rather than the process: send the supplier the number of grills and lines, the cleaning window, the water and drainage points and your meter comparison, and ask for customized steam cleaning equipment quoted against what you measured.
