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Introduction

Remote clinics and small hospitals often operate a single washer-disinfector (WD) a long way from the nearest service technician. This paper evaluates the cost of extending WD service life towards 20 years against replacement at 10 years, using equivalent annual cost with a hospital-grade bedpan WD as the example. It states every assumption, tests the result against distance, machine price, outage cost, failure rate and discount rate, and sets out the maintenance, spare parts, downtime and compliance controls that life extension requires.

Overview: Lifecycle of Washer-Disinfectors in Healthcare

Useful life: The WA Health Medical Equipment and Imaging Replacement Program Guidelines (version 1.2) state a useful life for medical equipment of 5 to 15 years, note that extending the recommended useful life is not common practice, and base replacement on asset condition rather than useful life alone. Their prioritisation factors include age, risk of failure, availability of spare parts and maintenance services, criticality of the service and impact on service delivery.

Wear life and calendar life: Plan a 10 year life for a WD in high use, with a condition review from year 8. A WD in high use, e.g. 20 cycles per day on 260 days per year, completes 52,000 cycles in 10 years. A remote clinic running 4 cycles per day on 260 days per year accumulates 1,040 cycles per year, or 20,800 cycles in 20 years. At this usage, cycle wear does not set the life. Calendar ageing of elastomers and electronics, controller obsolescence and spare parts availability do. Confirm that the rated duty of the machine class covers the planned annual cycles.

Spare parts: Require spare parts and service support for at least 10 years in the purchase contract. Before committing to extension beyond 10 years, obtain the supplier's written end-of-support date for the controller, pumps, heating elements and sensors, and buy critical spares before support ends.

Remote service access: The Australasian Health Facility Guidelines (Part B 0190, revision 7.0, August 2022) require redundancy to be factored into service capacity, identify distance from service technicians as a consideration for rural and remote services, and state that two WDs and two steam sterilisers are preferred for smaller and rural and remote sterilising services units. A single-WD site depends on the reliability of one machine and on its business continuity plan.

Lifecycle Cost Over 20 Years

Method: Compare strategies with different machine lives on equivalent annual cost (EAC): the present value of all costs over one machine life multiplied by the capital recovery factor for that life. Comparing 20 year cash totals without residual value overstates the benefit of life extension, because the 10 year strategy ends with a 10 year old machine that still has service life. Divide EAC by annual cycles to obtain cost per cycle.

Assumptions: The model uses the following illustrative values.

Basis: The vehicle rate is the Australian Taxation Office cents per kilometre rate for 2026 to 2027. The refurbishment replaces the steam generator element, pumps, solenoid valves, door seal, dosing pump and temperature sensors. Accommodation and travel allowances are excluded. All other values are illustrative. Replace them with quoted prices, the actual distance and the failure history of the machine.

Equivalent Annual Cost: The five strategies compare as follows. Differences are relative to replacement at 10 years.

Cost Elements: EAC by element for replacement at 10 years and refurbishment with a 20 year life is as follows.

Result: Replacement at 10 years has the lowest EAC, A$10,639 per year or A$10.23 per cycle. Refurbishment at year 10 with replacement at 15 years is A$22 per year higher, which is within the precision of the inputs, so the two strategies are equal on cost. Extending life from 10 to 20 years reduces capital recovery by A$1,056 per year. Repair and outage cost rise by A$1,081 per year even with refurbishment, and the refurbishment adds A$321 per year.

Travel: Travel for installation, planned visits and repairs is A$4,120 per year, 39 % of the EAC of replacement at 10 years. It is 59 % of the planned visit cost and 70 % of the repair cost per failure. Combine WD visits with servicing of other equipment at the site, train local staff in first-line tasks, and hold critical spares on site so that a failure needs one technician trip, not two.

Critical Spares: Without critical spares on site, assume half of all failures need a second trip to fit parts, with 5 further outage days. The EAC of replacement at 10 years rises by A$1,701 per year. Spares held on site replace parts that would otherwise be bought at the time of each repair, so the holding cost of a A$2,000 spares kit is its capital recovery, A$259 per year over 10 years at 5 %. Hold the kit on site.

Sensitivity

The following table varies one input at a time and gives the strategy with the lowest EAC, and the EAC of refurbishment with a 20 year life relative to replacement at 10 years. The strategies are abbreviated as Replace at 10, Refurbish, keep 15, and Refurbish, keep 20.

Close Result: Replacement at 10 years and refurbishment with replacement at 15 years differ by less than A$230 per year in every case except machine prices of A$40,000 and A$60,000. Choose between them on condition, failure history, spare parts end-of-support dates and compliance risk, not on cost alone.

Life Extension to 20 Years: Refurbishment with a 20 year life has the lowest EAC only at machine prices of about A$40,000 or more, as for larger instrument WDs, or where failure rates are half the assumed values. Long distance, high outage cost, higher failure rates and the absence of critical spares favour replacement at 10 years.

Break-Even Values: At the base assumptions, refurbishment with replacement at 15 years is lower than replacement at 10 years where the machine price exceeds about A$18,700 or outage cost is below about A$438 per day. Refurbishment with a 20 year life is lower where the machine price exceeds about A$25,000. Keeping the machine 20 years without refurbishment is lower only where the machine price exceeds about A$50,000.

Equipment Replacement Intervals and Financial Implications

Replacement rule: Keep the existing machine while the cost of its next year of operation, being planned maintenance plus expected failure and downtime cost, is less than the minimum EAC of a replacement. At the assumptions used, the minimum replacement EAC is A$10,639. An unrefurbished machine costs A$9,456 per year in years 6 to 10 and A$12,295 per year in years 11 to 15, so replace it at about 10 years. A machine refurbished at year 10 costs A$9,756 per year in years 11 to 15 and A$12,595 per year in years 16 to 20, so replace it at about 15 years.

Downtime cost sensitivity: The refurbished 20 year strategy is cheaper than 10 year replacement only while each day of WD outage costs less than about A$137, or A$685 per 5 day failure. Cost the site's contingency measures per outage day, e.g. single-use containers, additional staff time and transport, and compare the result with this value.

Water and energy sensitivity: Measure water and energy per cycle on the existing machine and obtain stated figures for replacements. At remote clinic cycle counts the difference is small for bedpan WDs. An older machine using 15 L [4 US gal] and 0.2 kWh more per cycle costs A$140 per year more at 1,040 cycles per year, A$5 per kL [A$18.93 per 1,000 US gal] and A$0.30 per kWh.

Replacement triggers: Plan replacement when one or more of the following applies:

• Annual maintenance and repair cost exceeds the proportion of replacement cost set in the asset management plan, e.g. 10 %, or has doubled over 3 years.
• Unplanned failures exceed the threshold in the asset management plan.
• Critical spare parts or service support are no longer available.
• The machine fails annual requalification or cannot meet AS 5369:2023.
• A major structural defect, e.g. chamber or steam generator cracking, makes repair uneconomic.

Funding windows: Where replacement funds are available only in set budget cycles, compare replacing in the current window with the expected cost of operating to the next window, including the cost of an unplanned replacement with expedited freight and interim outsourcing.

Impact on Patient Care Continuity and Downtime

Effect of outage: At a single-WD site, an outage stops automated cleaning and disinfection until repair. The site must defer procedures, transport devices to another facility, or use the documented contingency procedure. Life extension reduces downtime only where planned replacement of wear parts prevents failures. Running an ageing machine to failure increases outage frequency.

Business continuity: AS 5369:2023 requires systems, e.g. a business continuity plan, that maintain compliance under emergency or suboptimal conditions, with documented backup procedures. For a single-WD site include:

• For instruments, a validated manual cleaning procedure for each device type, from the device IFU, with trained staff, PPE and cleaning efficacy inspection. Devices are then disinfected or sterilised as their classification requires.
• For human waste containers, single-use containers or access to a WD at another location. Do not clean bedpans manually.
• A mutual aid agreement with another reprocessing facility and a transport procedure for used devices.
• Additional instrument sets, or single-use human waste containers, sized to cover the expected outage duration.
• A loan machine arrangement, stating delivery time to site.
• Critical spares held on site, selected from failure history: e.g. door seal, circulation pump, heating element, dosing pump, solenoid valves and temperature sensor.

Planned outages: Schedule planned maintenance and annual requalification in a fixed window with low procedure demand, and arrange contingency reprocessing in advance.

Condition monitoring: Trend cycle time, fill time, heat-up time, water use per cycle and fault codes from the cycle records. Rising heat-up time indicates scale or element faults. Rising fill time indicates low supply pressure or blocked strainers. Address trends at the next planned visit before they cause failure.

Process assurance: Age does not change the release criteria. Check the process record at the end of every cycle, including water pressure, flow and spray action, cleaning agent dosage, and temperature and time at disinfection temperature. Inspect every item for cleanliness. Reprocess any load with a cycle parameter outside limits, and withdraw the machine from service until a failed cleaning efficacy check or requalification test is resolved.

Best Practices and Recommendations

• Maintenance program: Maintain the WD under a documented medical equipment management program, e.g. to AS/NZS 3551, with daily user checks from the IFU, planned preventive maintenance, annual requalification and an annual electrical safety check as required by AS 5369:2023.
• Water quality: Hold wash water to a hardness of 150 mg/L or less and chloride of 120 mg/L or less, and final rinse water to the AS 5369:2023 limits. Scale on electric immersion elements mainly shortens element life rather than raising energy use. Scale on nozzles and spray arms reduces spray coverage.
• Wear parts: Replace door seals, dosing tubing and other low-cost wear parts at fixed intervals. Replace pumps, heating elements and sensors before the shortest life observed in the failure history.
• Critical spares: Hold a critical spares kit on site, selected from the failure history, and replace each part as it is used.
• Cost records: Record every maintenance, repair, part, travel cost and outage day against the machine. Recalculate the cost of the next year of operation annually and compare it with the replacement EAC.
• Refurbishment decision: At year 8 to 10, decide between replacement and refurbishment using condition, failure history, spare parts end-of-support dates and the EAC comparison.
• Redundancy: A second bedpan WD, installed and maintained on the same visits as the first, adds A$6,324 per year including its own repairs. It avoids about 3.6 outage days per year, and is justified where outage cost exceeds about A$1,757 per day, or about A$866 per day where repairs of either machine can wait for a planned or combined visit. The calculation ignores coincident failure of both machines.
• Procurement: Specify the machine class for the actual duty, a 10 year spare parts and service support period, remote diagnostics, stated water and energy use per cycle, and conformance to ISO 15883-1:2024 and the applicable part of ISO 15883.

Conclusion

For a hospital-grade bedpan WD priced at A$18,000 at a site 400 km [249 mi] from the service base, travel is 39 % of annual cost. Replacement at about 10 years and refurbishment with replacement at about 15 years have the same equivalent annual cost within A$22 per year, and keeping the machine 20 years costs 3 % to 15 % more per year. Life extension to 20 years pays where the machine price exceeds about A$25,000, as for larger instrument WDs, or where failure rates are low. Shorter travel, shared visits and low outage cost favour refurbishment at year 10. Long distance, high outage cost and the absence of critical spares favour replacement at 10 years. Where life is extended, do so only with a maintenance program, critical spares on site, confirmed spare parts support, condition and cost tracking, a tested business continuity plan, and continued compliance with AS 5369:2023 at every requalification.

Sources

1. Standards Australia. AS 5369:2023 Reprocessing of reusable medical devices and other devices in health and non-health related facilities.
2. Australasian Health Infrastructure Alliance. Australasian Health Facility Guidelines, Part B 0190 Sterilizing Services and Endoscope Reprocessing Units, revision 7.0, August 2022.
3. Department of Health, Western Australia. Medical Equipment and Imaging Replacement Program Guidelines, version 1.2 (MP 0179/23).
4. Australian Taxation Office. LI 2026/19 Cents per kilometre deduction rate for car expenses, 2026 to 2027 income year.
5. AS/NZS 3551 Management programs for medical equipment.
6. ISO 15883-1:2024 Washer-disinfectors, Part 1: General requirements, terms and definitions and tests.
7. IEC 60300-3-3 Dependability management, Part 3-3: Application guide, Life cycle costing.