03 Jul TMV Testing: Why Annual Servicing Is Not Optional for Your Facility
If you manage an aged care home, medical centre, childcare centre or any facility that cares for vulnerable people, thermostatic mixing valves are quietly doing one of the most important safety jobs in your building. They are also one of the most commonly neglected. I have serviced TMVs across Brisbane healthcare and aged care facilities for decades, and I still walk into plant rooms where valves have not been touched in years. Here is what TMV testing involves, why the annual requirement exists and what happens when it gets skipped.
What a thermostatic mixing valve does
A thermostatic mixing valve blends hot and cold water to deliver a safe, stable temperature at the outlet, typically no more than 45 degrees Celsius in facilities caring for vulnerable people. Hot water needs to be stored at 60 degrees or above to prevent Legionella bacteria growing in the system, but water at that temperature causes serious scald injuries in seconds. The TMV solves both problems at once, keeping the storage hot and the delivery safe.
Children, the elderly and people with reduced mobility or sensation are at the highest risk of scalding because they cannot react quickly to hot water. That is why TMVs are mandatory in healthcare, aged care and early childhood settings, and why the testing requirements around them are strict.
The annual testing requirement
TMVs must be tested and serviced every 12 months by a licensed plumber with TMV accreditation, in line with AS 4032.3. The annual service is not a quick glance at the valve. It involves verifying the outlet temperature, testing the cold water isolation failsafe, checking and cleaning the strainers and internal components, replacing seals and O-rings where required, and recording the results for each valve.
The failsafe test matters most. If the cold water supply to a TMV fails, the valve must shut off the hot water rather than let scalding water through. A valve that passes on temperature but fails on isolation is a valve that will hurt someone the day your cold supply is interrupted.
Record keeping and your compliance obligations
Every tested valve should have a service record showing the date, the results, the technician’s licence details and any parts replaced. For aged care providers and healthcare operators, these records are part of demonstrating your duty of care during accreditation and audits. If an incident ever occurs, your TMV service history is one of the first things investigators will ask for.
We tag every valve we service and provide facility managers with a complete register, so you always know what was tested, when, and when the next service falls due. No chasing paperwork, no gaps.
The real cost of skipping a service
A neglected TMV drifts. Scale builds up, seals harden, and the valve either delivers water hotter than it should or fails to respond when supply conditions change. The worst outcomes are scald injuries to residents or patients, and those incidents carry human, legal and reputational costs that dwarf the price of an annual service many times over.
There is a practical cost too. Valves that are serviced annually last significantly longer than valves left to seize up. Replacing a failed TMV, along with the emergency call out and the disruption to a working facility, costs far more than a decade of scheduled testing.
How we handle TMV programs for facilities
Alexander Gas and Plumbing Co runs scheduled TMV testing programs for aged care centres, medical practices, hospitals and childcare centres across Brisbane and South East Queensland. We are a family owned team, established in 2013, and we work around your facility’s routine. In aged care that usually means servicing wings progressively so residents are never left without warm water, and always leaving every room exactly as we found it.
Because we hold both plumbing and gas licences, TMV servicing often gets bundled with the rest of your compliance calendar, including backflow testing and gas appliance servicing, in a single program with one point of contact.
TMVs are the kind of infrastructure nobody thinks about until something goes wrong, and in a care facility, something going wrong means someone getting hurt. If your valve register is out of date or you are not certain when your last full service happened, that is the sign to act. Call us and we will get your facility onto a proper annual program, with records that stand up to any audit.
Frequently Asked Questions
How often do TMVs need to be tested?
Every 12 months, by a licensed plumber with TMV endorsement, in accordance with AS 4032.3. High risk facilities sometimes choose six monthly temperature checks in between full services, but the annual service is the compliance baseline.
What temperature should water be delivered at in aged care?
Warm water outlets used for personal hygiene in aged care, healthcare and childcare settings must not exceed 45 degrees Celsius. Storage temperatures stay at 60 degrees or above to control Legionella, which is exactly why the mixing valve is needed.
Can our maintenance staff test TMVs in house?
No. TMV testing and servicing is licensed plumbing work requiring specific accreditation. In house staff can monitor outlet temperatures between services and report anything unusual, which we encourage, but the annual service must be done by an accredited plumber.
How many TMVs does our facility have?
More than most managers expect. Any warm water outlet serving residents or patients is typically fed by a TMV. If you do not have a valve register, we can audit the site, tag every valve and build the register as part of your first service.
With over 30 years in the plumbing industry he provides a level headed and experience approach to all client related work.He is genuine person with a keen interest in family, friends and helping others.
He holds Queensland Plumbing Licence 28840, Gas Licence L31 902, QBCC License 12 654 79, and Building Assets and Services Contractor licence 860 066.
Rich believes in educating clients about their plumbing systems and providing honest advice about when professional help is needed.
He founded Alexander Gas and Plumbing Co in 2013 to provide personal, trustworthy service to Brisbane families and businesses.
- Instantaneous Hot Water Systems in Brisbane Explained - 6 October 2026
- How To Clear A Blocked Drain In Brisbane - 17 September 2026
- Is Solar Hot Water Worth It in Brisbane? - 9 September 2026
No Comments