Size around peak throughput, not average
Calculate instrument sets processed on your busiest day, not your average day. A CSSD that cannot clear the backlog from a heavy operating list becomes the constraint on theatre scheduling.
Two smaller chambers often beat one large chamber: you retain capacity during maintenance and can run differentiated cycles concurrently.
Cycle types
Confirm the cycles your instrument mix requires — porous load, instrument, and where applicable rapid cycles for urgently required sets. Heat-sensitive items may require low-temperature sterilisation, which is a different machine entirely.
Specify cycles against your actual instrument inventory, including loaned sets.
Utilities will constrain you
Steam supply or integral generator, water quality, drainage, power and ventilation and heat load all need confirming before selection. Water quality in particular is frequently overlooked and is a leading cause of chamber and instrument damage.
Where feedwater quality is poor, budget for treatment at the outset rather than after the first failure.
Validation and routine monitoring
A sterilizer is only as good as the evidence that it worked. A functioning CSSD programme includes installation, operational and performance qualification, routine chemical indicators, biological indicators at defined intervals, air-removal testing for porous-load cycles, and documented load traceability.
Monitoring consumables and the traceability system should be specified alongside the sterilizer, not procured later.
Workflow around the machine
Sterilisation is one step in a sequence: pre-cleaning, washer-disinfection, inspection and packing, sterilisation, storage and distribution. A new autoclave inserted into a department with inadequate washer-disinfector capacity or no clean/dirty separation will not deliver the improvement expected.
Assess the whole workflow before buying a single machine.
Frequently asked questions
One large autoclave or two smaller ones?
Two smaller chambers usually offer better resilience and cycle flexibility; one large chamber creates a single point of failure.
What is most often overlooked?
Feedwater quality and washer-disinfector capacity upstream of the sterilizer.