TMV testing and servicing
A thermostatic mixing valve, or TMV, blends hot and cold water to deliver water at a safe, steady temperature at basins, showers and baths. They're used wherever there's a higher risk of scalding, such as aged care homes, childcare centres, health facilities and some homes. Because a TMV is a safety device, it needs regular testing and servicing to make sure it still shuts down and holds temperature as it should. Our licensed plumbers test, service and replace TMVs and keep records you can rely on.
Where TMVs are used
Aged care facilities
Protecting residents who may be less able to react quickly to hot water.
Childcare centres and schools
Delivering warm, not hot, water at children's basins.
Healthcare and medical practices
Clinics, consulting rooms and other health facilities with patient-use outlets.
Homes and accessible bathrooms
Some homes have TMVs installed for safety, particularly for older residents or people with disability.
What a TMV service includes
Testing follows the procedures in the relevant Australian Standard, AS 4032.3, and the manufacturer's instructions.
- Temperature checks. We measure the mixed water temperature at the outlet and adjust if needed.
- Fail-safe test. We check that the valve shuts off or reduces flow quickly if the cold supply fails.
- Strainers and check valves. Cleaned or replaced so the valve receives a steady supply.
- Replacement of worn parts. Seals, thermostatic elements and other components replaced in line with manufacturer recommendations.
- Records and tags. We record the results for each valve so you have documentation on file.
How often should TMVs be tested?
Australian Standard AS 4032.3 covers the maintenance of thermostatic mixing valves, and annual servicing by a licensed plumber is the widely accepted benchmark. Critical components are also replaced at intervals set by the standard and the manufacturer. Health, aged care and childcare facilities may have additional requirements under their own policies or regulators, and NSW Health has a specific policy for hospitals, so check what applies to your facility.
Maximum delivery temperatures in these settings are also lower than in a standard home. Healthcare buildings, including aged care and childcare, are generally required to deliver water at personal hygiene outlets at no more than 45°C.
Ongoing testing schedules
For facilities with multiple valves, we can set up a regular testing schedule so nothing falls through the cracks. If your facility also has a backflow prevention device, we can test that at the same time. See backflow testing.
Why Eastern Suburbs locals call us
- 100+ five-star Google reviews
- Licensed plumbers and gasfitters (Lic. 398171C)
- Free quotes, and a clear price before any work starts
- We test both TMVs and backflow devices, so one local team can look after your facility's compliance testing.
Common questions
What does TMV stand for?
Thermostatic mixing valve. It mixes hot and cold water to a set temperature and adjusts automatically if supply temperature or pressure changes.
Who can test a TMV?
Testing and servicing should be done by a licensed plumber following AS 4032.3 and the manufacturer's procedures.
How often should a TMV be serviced?
Annual servicing is the general benchmark, with some facilities requiring more frequent checks under their own policies.
Do I need a TMV at home?
Not every home needs one, but they're a sensible safety measure where young children or older people live. Ask us if you're unsure.
We test TMVs for facilities in Maroubra, Hillsdale and Randwick.