Why the honest answer protects the contractor as much as the client
Steam is effective on most kitchen grease filters, and a contractor who says it works on every filter will eventually be holding the pieces of a warped one. Grease filters vary by design, mounting, age and how long they have carried accumulated grease, and some of those conditions make steam the wrong tool — not because steam lacks power, but because its power is the problem. A supplier or contractor who can state clearly where steam should not be used wins the contract over one who promises everything. The situations below are the ones where the method should be declined, substituted or re-specified.
Case 1: filters that are warped, corroded or near end of life
- Thin-gauge baffle filters that have already been cleaned many times are often distorted and thin at the edges. Heat and the mechanical effort that follows a steam pass accelerate the failure.
- Corroded or pitted frames and welded joints: heating a corroded weld line is how a filter separates in the crew's hands.
- Inspect before cleaning, and record it. A filter that was already defective becomes your liability if there is no dated photograph taken before the work starts.
Case 2: coatings and materials the operator or manufacturer has excluded
- Coated or treated filter media, and any filter whose manufacturer states a cleaning method and forbids others: the instruction overrides the contractor's preference.
- Galvanised or plated components with damaged coating: steam under a lifted coating lifts it further, and the item will corrode within weeks.
- Aluminium filters in some designs: aggressive cleaning chemistry plus heat can attack the surface. Confirm the material before the method, not after.
Case 3: the extraction system cannot accept the work
- Fixed, non-removable filter cells in a duct run that has never been deep cleaned: steam softens the surface layer of old grease but leaves the mass behind, giving a visually improved result and no real risk reduction. This needs a restorative programme first, priced separately.
- Sites where runoff from the clean cannot be contained or disposed of legally. Grease-laden water washing into a general drain is a compliance breach, and it is the operator's responsibility to provide a collection route.
- Live kitchens with no ventilation capacity to carry away the humidity a steam job generates; the job then creates a condensation and slip problem.
- Any hot-work situation where the site's fire-safety rules do not permit the method without a permit process that has been agreed and issued.
Case 4: the machine is wrong for the volume, so the method fails in practice
A crew that cannot hold its output through the job will substitute a weaker method and still sign the sheet. Where the site has many filter cells, a machine that must stop to refill or to recover heat cannot deliver the method the contract describes. The Fixed Steam Cleaning Machine PowerDe HW02 is the mains-fed answer for high-volume work: 220 V supply, 6 kW heating power, roughly 160°C steam temperature and about 0.8 MPa vapor pressure, an 80 L SUS304 tank, and dry-steam and wet-steam modes plus a vacuum function on one machine. Where there is no usable supply at the hood line, the hand pushed steam cleaning machine PowerDe HMW3 carries a 50 L clean-water tank with a 4.5 kW PTC heater in a hand-push frame.
The honest recommendation is sometimes the cheaper one: if the filters come out and there is a soak or wash facility, most of the work belongs there, and steam is used only on the canopy and remaining surfaces. That conclusion requires knowing what the machine can sustain, which is why our PowerDe cleaning equipment series page lists mains-powered and battery or mobile variants side by side.
How to decline the job without losing it
- Ask for photographs of a pulled filter cell and the last deep-clean date before quoting. Most of the exclusions above are visible in two photographs.
- Put the scope boundary in writing: filters and canopy in scope; duct, fan and terminal excluded, or priced as a separate restorative project.
- Offer the alternative — soak-and-wash, chemical degreasing, or replacement of end-of-life cells — and let the client choose with the trade-offs stated.
- Record condition before and after, per cell. That record is what converts a later complaint into an inspection.
Where steam is suitable, confirm the figures the product pages do not publish — consumption per hour in each mode, runtime, hose and lance lengths, accessory set — and check the site's water connection against the published 4-point internal-tooth inlet before the first visit. Send us the filter photographs, the hood layout and the site's power, water and drainage arrangements, and we will tell you honestly whether steam is the right method for that site and which machine suits it — including when the right answer is that it is not.
