What the grout has on it before you choose a method
Two different deposits hide behind one phrase, "dirty grout", and they ask for different treatment. The first is cooking grease: aerosolised frying oil that settles on the floor and polymerises into a film, thickest beside the fryer line, the range and the grill, and along the wall where splatter runs down. The second is tracked-in soil: starch, sugar, milk fat and the dust brought in on shoes, compacted into the joint by foot traffic. A walk-behind scrubber with a dilute detergent pass removes the loose fraction of both and leaves the bonded fraction exactly where it was, which is why the grout still looks grey the day after the floor was scrubbed.
Heat is what changes the second kind of contact. In commercial kitchen steam cleaning, temperature softens polymerised oil so it lifts out of the joint instead of being scrubbed at its surface, and the low water volume keeps the joint from filling with the standing water a hose leaves behind. On a production floor working with hardened cutting oil, the same mechanism is what machine tool steam cleaning relies on: the deposit is heated until it moves, then removed, and the surface is close to dry when the operator finishes.
Which machine form fits the floor you actually have
A fixed unit stays where the utilities are. The fixed steam cleaning machine PowerDe HW02 is listed at 220 V with 6 kW heating power, an 80 L SUS304 tank and a tap-water inlet with a 4-point internal-tooth 1/2 inch joint, and the page gives its overall size as 1,200 × 800 × 1,200 mm including handles. That footprint and those connections have to be checked against real kitchen clearances: the service aisle, the doorway from the store room, the servery hatch, and the gap behind the line equipment the machine has to pass. A fixed unit suits a kitchen where one crew cleans the same zones every day and a water supply and a drain route can be run to one position, not an extension lead shared with cooking equipment.
Hand-pushed and driving-style units are the forms to look at where cleaning moves. The hand-pushed steam cleaning machine in the PowerDe range travels on its own wheels, so the narrowest gap on the route — a door, a kerb, the space between two prep tables — decides whether it can reach the joint at all. Driving-style units are listed for indoor garages and narrow outdoor parking spaces, which is a vehicle-movement context rather than a servery floor. Whichever form is chosen, the dry-steam and wet-steam settings matter per area, not per machine: wet steam carries more free water and suits a thick deposit in an open floor area, while dry steam, carrying less, is the setting to specify close to electrical equipment, a control cabinet or a wall fixing where the water has nowhere to go.
Setting the machine to the joint instead of to the tile
The tile is forgiving; the joint is the part that records every setting. Four variables decide the result, and all four belong in the trial record:
- Mode. Wet steam first where the deposit is thick and polymerised, dry steam last so the joint finishes dry rather than full of water.
- Dwell. Heat needs a moment to soften the deposit. Short passes over a heavy line do less work than one slow pass that holds the heat on the joint.
- Nozzle distance and angle. A nozzle pressed against a joint drives vapour under the tile edge and can lift the seal at the perimeter. Keep the nozzle moving and angled so the released soil is pushed out of the joint, not packed back into it.
- Pass count and sequence. Work from the cleanest area to the dirtiest, usually the store room toward the fryer line, so a crew is not walking clean soil through the dirty wash water.
Sweep and pick up dry soil before any liquid goes on the floor, then remove the loosened soil and the condensate as the pass finishes rather than letting it sit in the joint and dry back in. A written pass/fail standard settles the rest: pick one reference point, a joint beside the grill, and decide what a pass looks like there so two operators reach the same answer without a gauge.
What has to be true in the kitchen for a fixed machine to work
Three site checks decide whether the machine can be used at all, and they belong to the kitchen, not to the supplier. Power: a 6 kW heating load on a 220 V supply needs a circuit of its own with the protection and earthing the local rules require, confirmed by an electrician before delivery. Water: the inlet takes tap water through a specific fitting, so a hose run has to reach the machine's position, and hard water in the supply is a descaling question that comes back on a schedule. Drainage: the wash water leaves the floor carrying cooking oil, so its route to the drain has to go through the grease interceptor the kitchen already operates, and the collection of that run-off under local rules is a cost that belongs in the comparison between methods, not an afterthought.
The cleaning window sets the practical limit. In most kitchens steam work happens after service, with equipment cooling and the crew already committed elsewhere, so one timed clean against a defined finish tells you more than any brochure figure. Cover or move dry goods and exposed food before the pass, because steam releases vapour that travels, and keep the pass under the extract canopy rather than pointing the loosened grease into the ductwork.
What to ask for before you place the order
Ask for the figures that decide the job and are not printed on the product page. The HW02 page publishes its electrical and thermal specification and its tank and footprint, and it also lists leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. What it does not publish is the nozzle set, hose and wand length, duty cycle, descaling interval and spare-part availability. Those four items decide whether a crew can keep working on a joint at the end of a busy service, so put them in the written enquiry and require an answer in writing.
Then run the trial before the purchase order. The PowerDe PowerDe cleaning equipment range covers fixed, hand-pushed and driving-style steam units for cleaning work, and the company lists customised configurations and technical support for a named cleaning point. Send the kitchen layout, the cleaning window and the pass/fail standard for the worst floor, and ask for a trial on that floor. If the site conditions are outside what a product page documents, that scope goes into the order as written custom scope, together with the warranty treatment of out-of-scope use, rather than being assumed.
Before you buy, confirm the grout itself
One check comes before the machine: tap the tile near the worst floor and tap the same tile in a low-traffic area. A hollow sound, a cracked joint, or grout that comes away under a fingernail means the floor is past cleaning, and any hot pressurised jet will only speed up the failure. Sound joints and a bond that has held are what make a steam pass worth specifying. When that is confirmed, and when the utilities, the drainage route and the cleaning window are confirmed alongside it, floor grout becomes a repeatable task with recorded settings instead of a nightly argument about whether the floor is clean.
