We get this question every week from practice managers and principals working through a refit. The ultrasonic on the worktop works fine. Instruments come out clean. Last year’s CQC report said nothing about the cleaning method. Why move to a washer-disinfector?
The short answer is that HTM 01-05 already moved. The longer answer is below.
The 2013 edition has a quietly firm preference. Paragraph 3.2 reads:
“Wherever possible, cleaning should be undertaken using an automated and validated washer-disinfector in preference to manual cleaning, as a washer-disinfector includes a disinfection stage that renders instruments safe for handling and inspection.”
Paragraph 3.13 goes further:
“Using a washer-disinfector is the preferred method for cleaning dental instruments because it offers the best option for the control and reproducibility of cleaning; in addition, the cleaning process can be validated under European Norms (ENs).”
Paragraph 3.3 spells out where each method sits in the two-tier compliance framework. Manual cleaning, with or without an ultrasonic, is acceptable under Essential Quality Requirements, the floor every practice must meet. Best Practice asks for an automated washer-disinfector. CQC inspects dental practices against HTM 01-05 and expects to see practices either at Best Practice or with a documented plan to move there.
That’s the rulebook. Now the practical comparison.
An ultrasonic cleaner uses cavitation. High-frequency sound waves create microscopic bubbles in the fluid that collapse against the instrument surface and dislodge debris. It is a cleaning stage. It does not disinfect. After an ultrasonic cycle, instruments are still considered contaminated and need a separate sterilisation step.
HTM 01-05 §3.30(a) is also explicit that ultrasonic use requires a manual pre-rinse:
“Instruments should be briefly immersed in cold water (with detergent) to remove some of the blood and other visible soil before ultrasonic cleaning.”
So the real-world ultrasonic workflow is: manual pre-rinse, ultrasonic cycle, rinse, manual inspection, transfer to autoclave. Multiple operator touches per batch.
A washer-disinfector runs all the wet stages in one sealed cycle. HTM 01-05 §3.14 specifies five stages: a cold flush below 45°C to stop blood and proteins coagulating, a wash, a rinse, thermal disinfection at the validated holding time (typically 80°C for 10 minutes or 90°C for 1 minute), and a drying phase. By the time instruments come out of the WD they are clean, thermally disinfected, dry, and safe to handle and inspect before they go into the autoclave. One load. Walk away. Single operator interaction at start and end.
Both machines need validation at install, annually thereafter, and after any major repair. HTM 01-05 §13.2 and §14.2 use identical wording for each.
The day-to-day records diverge. A modern integrated WD writes a PDF cycle report to internal memory, a USB stick or a network drive after every cycle, with all cycle parameters and timestamps. The ultrasonic procurement spec at HTM 01-05 §10.21 also demands a data logger that records time, date, cycle number, duration, minimum and maximum temperatures and a cycle-failure indicator. In practice, many bench ultrasonics on dental worktops still rely on operator-logged paper records, which means more chance of a missing entry when the inspector asks for the last twenty-eight days.
HTM 01-05 §3.19 requires WD logbooks to be retained for not less than two years. Same retention rule applies to ultrasonic records.
Per-batch wall-clock time is broadly similar. A Tethys H10 Plus D90 cycle runs 41 minutes start to finish. An ultrasonic cycle is shorter (typically 3 to 6 minutes) but the surrounding manual stages bring the total per-batch operator labour up considerably. The difference is what your nurse is doing during the cycle. With a WD she loads it, presses go, and walks away. With an ultrasonic she pre-rinses, runs the cycle, rinses out, inspects, and transfers to the sterilisation pouches and into the autoclave.
Across a full clinical session the difference compounds. Practices we kit out with a WD typically free up 30 to 45 minutes of nurse time per session, not in cycle speed, but in operator-touches removed. For a busy two-surgery setup that’s measurable extra capacity at the front end of the appointment book.
A compliant medical-grade benchtop ultrasonic that meets the HTM 01-05 §10.21 procurement spec sits in the £1,000 to £2,200 range in 2026. A standalone medical ultrasonic still needs a separate validated steam steriliser alongside it. The total decon workflow with ultrasonic plus autoclave is typically £3,500 to £6,000 for the kit.
An integrated benchtop washer-disinfector currently runs £6,000 to £10,000+ for the unit, plus install, plus first-year validation. More upfront, but it replaces several manual stages and bundles the data trail.
For a new build or a refit, the WD math often works out comparable across a 10-year life when operator time saved gets factored in. For an established practice running a working ultrasonic well, the case is less clear. The ultrasonic stays compliant under EQR, and the upgrade is a deliberate move to Best Practice rather than a fix for non-compliance.
The unit we install most often where a WD is the right answer is the Mocom Tethys H10 Plus. It sits on a 470 × 430 × 500 mm benchtop footprint and runs all four stages in one cycle:
The 41-minute D90 cycle is the validated default. Integrated decalcification using standard dishwasher salt, on-board conductivity monitoring, AquaStop water-leak protection, and PDF cycle reports out to USB or LAN for the audit trail. Multi-user PIN management for tracking operator sign-offs. Certified to EN ISO 15883-1 and -2.
What makes it the sensible choice for practices weighing the ultrasonic-vs-WD question is that it doesn’t actually make them choose. The ultrasonic stage is built into the wash cycle. You get cavitation cleaning and thermal disinfection in one machine. Sits on the practice equipment page alongside our three Class B autoclave ranges from Castellini, Stern Weber and Mocom.
The decision shortcut.
Stay with a compliant ultrasonic if you’re a small single-surgery practice working to Essential Quality Requirements, your existing kit is in date, the inspections are fine, and the capital case for a WD doesn’t stack up this year. Make sure the unit meets the full §10.21 procurement spec (auto-locking lid, thermostatic control, over-temp cut-off, low-fluid cut-off, data logger). If it doesn’t, replace the ultrasonic before you consider whether to add a WD.
Move to a washer-disinfector if you’re refitting, building a new room, scaling to two or more surgeries, planning for the next CQC cycle, or want the audit trail to assemble itself rather than chasing operator signatures on a paper logbook. New-build practices should default to the WD because you only get the chance to design the room around it once.
For practices unsure which way to go, ring us on 01274 265566 and we’ll talk through your specific room, your throughput, and your CQC inspection horizon. We sell both, the Tethys H10 Plus for the integrated answer, and standalone medical-grade ultrasonics for the EQR-only case. Same engineer team installs and validates either. The service and maintenance page has the bundle pricing for both.
