When a restaurant group or an institutional catering department is asked to justify a new piece of cleaning equipment, the question is almost never "does it work?" It is "what does it cost us per clean, and is that cheaper than what we do now?" Kitchen pipe exteriors — extractor hoods, duct runs, trunking above the line — sit at the awkward end of that calculation: they are greasy, awkward to reach, usually cleaned by a contractor, and easy to postpone. The comparison below walks through the cost elements a facility manager can actually put a number to, using a hot steam unit such as the Fixed Steam Cleaning Machine PowerDe HW02 as one reference point rather than a promise.
A useful rule before any number goes on a spreadsheet: scenario wording on product pages does not always cover every duty a buyer has in mind. The HW02 listing documents vehicle exterior cleaning at service stations and parking facilities, interior work and engine-compartment work. If your pipes are in a kitchen, ask the supplier to confirm that duty in writing, along with the steam temperature and pressure you will be working to, before you build a business case around the machine.
What is actually on the pipe?
Cost starts with soil classification, because soil determines dwell time, and dwell time determines labour. A kitchen pipe exterior usually carries one of three deposits:
- Fresh aerosol grease — a soft, tacky film from the fry line. Soft deposits respond to heat quickly and are the cheapest square metre to clear.
- Polymerised grease — the hard, dark lacquer that has been heated and cooled many times. This is what drives a job from one shift to three, and it is where central kitchen degreasing costs get away from a facility.
- Mixed dust and grease — a gritty crust typical of pipes above preparation areas and near entrances. It needs the grit rinsed or wiped off before heat is worth applying.
Write the deposit type into your cleaning specification. A contractor quoting against "grease" and a contractor quoting against "polymerised grease lacquer, aged" will not give you the same price, and neither figure is comparable to your previous year until the soil is described the same way.
The cost lines to price out
Facilities that track cleaning spend properly tend to split pipe work into six lines. Missing lines are what make an in-house option look artificially cheap:
- Labour hours — including access time, not just scrubbing time. Pipe exteriors at height need steps, platforms or a lift; the drive up and down is real money.
- Downtime — the production window you lose. In a central kitchen that serves a fixed meal service, an evening clean that overruns is a failed service the next day.
- Consumables and chemicals — detergent, degreaser, and the run-off handling that goes with them.
- Water — volume used, and how it is contained and disposed of.
- Energy — heating water and, on electric units, the machine's own draw.
- Equipment and contractor margin — either the amortised purchase of a machine, or the supplier's overhead inside a quoted rate.
Price each line from your own records, not from an industry average. Your labour rate, your service window and your contractor's rate are the numbers that matter; published averages from another market will not survive a finance review.
Cost per square metre, and why per-job pricing hides it
Convert everything to cost per square metre of pipe surface, measured once and recorded on a drawing. That single change makes two otherwise incomparable options comparable, and it exposes the fixed-cost problem in contractor pricing: a small pipe run at height can cost more per square metre than a long run at ground level, because mobilisation, access and setup do not scale down with area.
Once you have cost per square metre, run the same figure at different frequencies. Cleaning quarterly is not one-quarter of an annual clean — the mobilisation and access cost is paid four times. Facilities that move from an annual deep clean to scheduled light cleaning usually find the annual total rises while the condition of the plant improves and the risk profile changes. That trade-off is a management decision, and it should be made with both numbers visible.
Where hot steam changes the arithmetic
High-temperature steam works on aged grease by heating it until it releases from the surface, which shifts cost from chemical contact time and scrubbing labour into machine output and operator time. That is the honest way to evaluate it: you are buying back labour hours and chemical lines, and paying for them with equipment and energy. It is not automatically cheaper, and it is not suitable for every deposit or every surface.
On a published unit such as the HW02, the parameters you can model are stated on the product page: 6 kW heating power, 160° steam temperature, 0.8 MPa vapour pressure and an 80 L SUS304 tank, on a 220 V supply, with switching between dry and wet steam and an integrated vacuum. Use those figures with your own tariff and your own crew rate to build the energy and consumables lines; they are more defensible than a verbal claim, and they let you compare two machines on identical inputs. Steam delivery, cycle time and crew size are the variables that move the result most, so measure them on a trial section rather than assuming them.
Three cost consequences of steam are worth stating explicitly in the business case, because that is where the saving usually appears or disappears. Water use falls when steam replaces a pressure-washing hose, which also reduces the run-off a facility has to contain. Chemical purchase, and the storage, handling and disposal cost that comes with it, can be reduced where heat alone is sufficient. And if the same commercial steam cleaning equipment is deployed on hoods, stovetops, grills and floors, the capital cost is shared across duties that were previously bought as separate services — normally the largest single swing in the model, and the reason to check a machine's full application range before committing.
The costs that never appear on a quote
Two lines are missing from almost every comparison and belong in yours. The first is the cost of a failed clean: a pipe exterior that looks clean at the inspection point but still carries a grease build-up further along the run has to be re-done, and re-work on plant at height is the most expensive hour in the schedule. Record re-work as its own line for a year and you will know what your current method really costs.
The second is the value of the condition you are buying. Grease on a pipe exterior is a fire-safety question as much as a hygiene one, and it shapes how an insurer, an auditor or a client's own inspection team sees your site. Most facilities cannot put a clean number on that, so state it as a qualitative factor and weigh it deliberately, rather than pretending the decision is purely arithmetic.
A short evaluation sequence
A practical order of work, which keeps the trial small and the numbers comparable:
- Measure the pipe surface area and classify the deposit type on a drawing; keep the drawing, it becomes your baseline.
- Pull twelve months of actual spend on pipe cleaning — contractor invoices, labour hours, chemicals, water — and convert it to cost per square metre per year.
- Get written confirmation of the intended duty, and the published steam temperature and pressure, for the machine you are considering.
- Run one trial on a representative section with your own crew, and time it: setup, heat-up, dwell, wipe-down, clean-up.
- Price the trial against your twelve-month baseline, including energy at your tariff, the amortised machine cost and any re-work you had to do.
- Only then set the frequency, and re-measure after two cycles rather than one.
If the trial lands close to your current cost, the tie-break should be the lines a quote never shows: downtime avoided, chemicals removed from the site, water used, and how much of your existing cleaning scope the same machine can absorb.
Questions to send the supplier
Before a number goes into the business case, put these to the manufacturer and keep the answers on file: can the unit be used on kitchen pipe exteriors and hood surfaces, and with what limits on the surface being cleaned; what steam temperature and pressure are delivered at the nozzle rather than at the boiler; what utility connections are required at the point of use; what protection is built in against dry running and overheating; and what the service interval and spare-part lead times are in your country. Shenzhen PowerDe Automation Precision Equipment lists engineering and customisation services alongside its equipment, so a non-standard configuration or a duty-specific confirmation is a reasonable request — start it from the HW02 product page or the contact page, and get the answer in writing.
A facility that prices pipe exteriors this way ends up with something more useful than a machine recommendation: a repeatable cost model that survives a change of contractor, a change of site and a change of equipment.
