Also called: Hospital sterilizer, CSSD sterilizer, Large steam steriliser
Hospital Steam Sterilizers for CSSD and Day Surgery
When a reprocessing department outgrows tabletop autoclaves, the decision shifts from choosing a machine to planning a room, a steam supply and a validation programme.
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Small and large sterilisers are different standards
A tabletop autoclave is built to EN 13060, which covers small steam sterilisers that cannot hold a standard sterilisation module. A hospital steriliser is built to EN 285, which covers large steam sterilisers able to take at least one module of 300 × 300 × 600 mm — the unit (often called an STU) in which their capacity is usually quoted. EN 285 sets tighter requirements for steam quality, chamber testing and the documentation a hospital needs for validation.
| Small (EN 13060) | Large (EN 285) | |
|---|---|---|
| Typical chamber | About 8–60 L, tabletop | From roughly 100 L to several hundred litres, floor-standing |
| Loading | Trays and pouches by hand | Baskets and rigid containers on a loading cart |
| Steam | Generated inside the unit from a small reservoir | Built-in generator, or central (house) or clean steam |
| Services | Single-phase socket, distilled or deionised water | Three-phase power, treated water, drains, often compressed air |
| Validation | Manufacturer type-testing plus routine monitoring | On-site installation, operational and performance qualification |
Read next EN 13060 classes B, N and S
Single-door or double-door (pass-through)
Single-door
Loading and unloading happen on the same side. It suits a small department where packing and sterile storage share a room, provided processed and unprocessed loads are kept clearly apart.
Double-door pass-through
The steriliser is built into a wall between the packing room and the sterile store. Loads go in on the clean packing side and come out on the sterile side, and the doors are interlocked so both can never be open at once. This is the usual layout for a hospital CSSD.
Plant room behind the machine
Large sterilisers are serviced from behind or beside the chamber. Plan an access space for engineers, so routine maintenance never has to happen in the clean areas.
Steam supply options
Steam quality matters as much as temperature. Wet steam causes wet loads; superheated steam sterilises poorly; non-condensable gases such as air block steam from reaching surfaces. Large sterilisers are tested for all three.
| Source | How it works | What to check |
|---|---|---|
| Built-in electric generator | The steriliser makes its own steam from treated water | Power rating, water treatment, generator descaling and service |
| House (plant) steam | Steam from the building boiler is piped to the steriliser | Boiler treatment chemicals and non-condensable gases can end up in the chamber and on instruments |
| Clean steam | A dedicated generator makes steam from purified water for sterilisation only | Higher cost, but steam quality you can control and test |
Planning the services
- Electrical: a dedicated three-phase supply sized to the steriliser and its generator.
- Water: treated feed water for the generator, plus cooling water if the model uses it.
- Drainage: drains that can take hot condensate, usually with a cooling or tempering arrangement.
- Compressed air: needed by some models for door seals and valves.
- Ventilation and heat: extraction in the plant room and enough air conditioning on both sides to remove the heat the machine gives off.
- Structure: floor loading for a heavy machine, delivery access, and a pit if you want floor-level cart loading.
- Workflow: space for loading carts on both sides, cooling racks and a sterile store sized to your turnover.
Read next Dirty-to-clean reprocessing layoutFeed water quality for sterilisers
Validation and routine testing
Before first use
Installation, operational and performance qualification under ISO 17665 principles, with load-mapping for the loads you actually process. Keep the full report — it is the baseline for every later test.
Every day
An air leakage test and a Bowie-Dick test before the first load, plus the cycle record for every load and indicators in each pack.
Periodically
Biological indicators as your policy requires, steam quality tests, calibration and annual requalification, and a fresh qualification after major repairs or a move.
Read next Bowie-Dick, indicators and validation
Who needs one, and when tabletop is enough
- Hospitals and day-surgery or ambulatory care centres with their own operating theatres usually need a CSSD with large sterilisers — often two, so one can be down for service.
- Large surgical trays and rigid containers simply do not fit tabletop chambers.
- A busy clinic or group practice can often meet its volume with two tabletop Class B units, which also gives it a backup.
- Heat-sensitive devices still need a low-temperature method, whatever the size of the steam steriliser.
Read next Low-temperature sterilisationSizing tabletop autoclaves
Registration in Malaysia
Under the Medical Device Act 2012 (Act 737), a medical device must be registered with the Medical Device Authority (MDA) before it is imported, exported or placed on the Malaysian market. A steriliser sold for reprocessing medical instruments is itself a medical device, so ask for its MDA registration number and check it on the MDA’s public register before you pay.
Related guides
Autoclave supply near you
Delivery, installation and training across Malaysia from Batu Caves, Kota Kinabalu and Kuching.
Frequently asked questions
What is the difference between EN 285 and EN 13060?
Why do hospital CSSDs use double-door sterilisers?
Can a hospital steriliser run on boiler steam?
Does a day-surgery centre need a large steriliser?
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