What you are actually assessing: four jobs, not one
A restaurant kitchen range hood collects grease in three places, and each one behaves differently under heat. The canopy's inner surface holds a thin, fresh film. The filters and the baffle traps hold a thick, oxidised deposit that has been baked on through hundreds of cooking cycles. The duct run beyond the fan holds the same deposit plus dust that has stuck to it. A cleaner that handles the fresh film may do nothing useful on the baked-on layer, and a machine that only melts surface grease leaves the duct work to a contractor.
Before comparing any two machines, write down which of those jobs you expect the purchase to cover, because that single decision drives every specification below. If the answer is "everything including the duct", the realistic equipment class is a fixed, mains-powered unit with substantial heating capacity, not a portable tank-and-burner unit. If the answer is "daily and weekly tasks on the hood, filters and cookline, with duct cleaning contracted out separately", a smaller machine is defensible and the budget can go elsewhere.
As an example of what a serious unit looks like on paper, the Fixed Steam Cleaning Machine PowerDe HW02 from Shenzhen PowerDe Automation Precision Equipment is specified at 6 kW heating power, 160 °C steam temperature, 0.8 MPa vapour pressure, and an 80 L SUS304 tank on a 220 V supply, with a switch between dry and wet steam. Those are not marketing adjectives — each one answers a specific question a buyer can put to any supplier.
Specification questions to put to every supplier
Heating capacity and steam temperature
Ask for installed heating power in kilowatts and for the steam temperature at the nozzle, not at the boiler. A low-kW element can hold a high temperature only at low output, and output is what strips grease. Small units that reach temperature slowly force operators to work in short bursts, which turns into skipped sections of the canopy and, eventually, into a failed inspection.
- Request the temperature at the nozzle under continuous operation, and the time from cold start to working temperature.
- Ask what happens to output when the tank runs down, and whether the machine can work while refilling.
- Check whether the supply voltage available in your kitchen matches the machine rating. A 220 V fixed unit needs a proper connection, not an extension lead shared with fryers.
Pressure and nozzle selection
Pressure carries the heat into the deposit instead of letting it slide off. A figure such as 0.8 MPa is worth asking other suppliers to match or exceed, and it should be quoted at the working point with the wand and nozzle fitted. Then check what nozzles are supplied: a fan spray for broad canopy surfaces, a concentrated jet for baffle traps and the front face of the filters, and a longer lance for the parts of the hood you reach with your arm outstretched. Machine-supplied accessories are part of the specification, not an optional add-on you discover later.
Tank volume and tank material
Tank size sets how long a crew can clean without stopping. In a kitchen that closes at eleven and reopens at six, a mid-shift stop to refill is a real cost, so an 80 L tank is one of the few numbers that directly changes the job schedule. Material matters just as much: a stainless steel tank such as the SUS304 body on the HW02 resists the mineral attack that a plain steel tank suffers in hard-water areas. If your water is hard, ask every supplier which treatment or filtration they require, and get it in writing — scale in a boiler is the most common cause of a steam machine being retired early.
Dry steam and wet steam modes
Two modes are genuinely useful in a kitchen. Drier steam carries more heat per unit of water and is the better choice on the canopy interior and on electrical and control panels, where you want heat, not water. Wetter steam, or hot water, does the mechanical work of flushing a loosened deposit off a filter. Ask whether the machine switches between modes by setting or by changing a nozzle, and how long the switch takes, because an operator will only use a mode that takes seconds to select.
Fixed, hand-pushed, or driven: match the machine to the site
Single-site restaurants usually want a fixed unit sited near the kitchen exit, plumbed to the water supply and to a drain, with a hose long enough to reach the hood. That is where the fixed steam cleaning machine class fits: highest heating capacity, largest tank, and no battery to manage. The PowerDe HW02's footprint, listed at 1,200 × 800 × 1,200 mm including handles, is a useful number to place on your floor plan before you enquire — measure the corner you intend for it, and check the door width you have to move it through.
Multi-site operators, contract cleaners, and groups with several kitchens in one building lean towards a hand-pushed steam cleaning machine, which moves between rooms without needing a fixed water connection. The trade is capacity: battery-powered, push-mounted units are lighter and more compact, which is exactly why they travel well and exactly why they carry a smaller tank and less heating power than a fixed machine. Drive-on mobile units, such as the PWD and HMW series in the same catalogue, are built around vehicle and forecourt work rather than kitchens, and are usually the wrong tool for a hood unless the same crew also washes delivery vehicles on site.
One honest question to put to the supplier: does the linked product page actually describe kitchen work? The PowerDe HW02 page is written around vehicle and forecourt applications, so ask for confirmation that it is being offered for commercial kitchen degreasing, and ask for a reference in that sector. A supplier who supplies that confirmation is worth more than one who quotes a lower price and leaves the application undefined.
Water, drainage, and the mess you have to manage
Steam cleaning a hood does not remove the grease, it moves it into a liquid you then have to collect. Plan for that liquid before the machine arrives: a bunded area or a drain under the work zone, a grease trap on that drain, and a means of containing run-off that will otherwise travel to the far end of the kitchen. This is the part of the purchase most buyers overlook, and it is the part inspectors notice.
- Confirm the water inlet connection the machine requires and whether it takes mains tap water directly.
- Locate a floor drain or a collection point beneath the hood, and check it can take hot, grease-laden water.
- Ask for the machine's water consumption at working output so you can estimate the volume per session.
- Agree the extraction and ventilation state during cleaning — hot steam in an unextracted kitchen is a condensation and slip problem.
The reason this section matters commercially is water volume. Steam work uses far less water than hose washing, which is why it can be done during service hours at all, and why floor and equipment surfaces dry in minutes instead of hours. The same logic applies to the rest of the back of house: for a wider view of commercial kitchen steam cleaning across cookline, floors and equipment, review how a fixed unit is scheduled against your closing time rather than buying it for the hood alone.
Safety and protection features worth checking item by item
High-temperature, pressurised equipment in a kitchen full of people needs defined protections, and a supplier should list them rather than summarise them. The PowerDe catalogue lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protection on its steam machines, with explosion protection noted on the fixed HW02 model. Take that list to competitors and ask which of the same protections their machine carries and how each one is tested at commissioning.
Then check the operator-side practicalities: the length and insulation of the wand, whether the trigger locks open for long runs, the length and abrasion resistance of the hose where it passes along a stainless steel edge, and the noise level if the unit sits inside the kitchen rather than in a store. Ask for the personal protective equipment the supplier expects staff to wear — gloves, apron, and eye protection are the minimum on any hot, pressurised jet.
Total cost over the life of the machine, not the invoice price
Put a simple three-year number beside each quotation. Start with the machine price, then add consumables (nozzles, seals, hoses, filters), the descaling or water treatment the supplier specifies, energy at the installed heating power multiplied by the hours you expect to run, and the labour saved by shorter sessions. A higher-priced fixed machine with an 80 L tank and 6 kW of heating often wins on that sheet precisely because the crew stops refilling and the canopy gets finished in one session.
Add the downtime line as well. Ask what spares the supplier holds locally, what the response commitment is, and what the machine's commissioning and training package covers. If you are buying more than one unit, or comparing the cleaning line against the rest of the supplier's capability, the PowerDe cleaning equipment category lists the full range in one place, which makes it straightforward to compare a fixed unit against hand-pushed and mobile alternatives from the same manufacturer.
A demonstration you should insist on
Do not accept a demonstration on a clean test panel. Agree a dirty baffle filter and a section of canopy that has not been cleaned for a month, and time the operator. Record four numbers: cold start to working temperature, time to clean one filter, time to complete the canopy interior, and water used. Ask the same four questions of each supplier and the comparison becomes mechanical instead of persuasive.
Watch two failure modes during the test. The first is output sag — the machine starts strong and loses steam after several minutes, which tells you the heating capacity is undersized for continuous work. The second is operator resistance: if the wand is heavy, the hose short, or the mode change awkward, staff will clean the visible surfaces and leave the duct end. The best machine is the one your least-motivated employee will actually use on a Friday night.
Before you place the order
- Scope: hood interior, filters, cookline, floors, or duct — and what is contracted out separately.
- Output: installed kW, nozzle steam temperature, working pressure, cold-start time.
- Capacity: tank volume, tank material, run time per fill, water consumption at working output.
- Modes: dry and wet steam, how the switch is made, and how long it takes.
- Site fit: machine footprint against your floor plan, door widths, supply voltage, water inlet, drain and run-off containment.
- Protections: the itemised safety list, plus how each is verified at commissioning.
- Application written confirmation: ask the manufacturer to confirm the model is offered for kitchen degreasing, not only for vehicle cleaning.
- Service: spares held, response commitment, training, water treatment requirement, warranty terms.
- Demonstration: your own dirty filters, timed, with the four numbers recorded for every bidder.
If you want an assessment against a specific model before quoting, ask the manufacturer for the full technical sheet — including the figures not published on the product page, such as steam temperature and pressure for the hand-pushed models — and put the same sheet in front of every bidder. Contact Shenzhen PowerDe Automation Precision Equipment on sales@powerde.net or +86 13023198376 to request it.
