Distinguish an ordinary mixer from a thermostatic product. Verify specification and installed model before commissioning tests or selecting a replacement.
How does it fit with water hygiene?
Manage scald prevention alongside legionella control. Local mixing allows the upstream hot and cold system to retain its intended control regime; reducing all hot-water temperatures to solve one outlet concern can conflict with that regime.
Separate mixed-outlet measurements from upstream supply readings. Keep mixed-water pipe lengths to the necessary arrangement and ensure maintenance access. One comfortable outlet result cannot establish the wider hot-water condition.
HSE's hot and cold water guidance explains temperature control, water hygiene and scalding. Reflect the applicable requirements for vulnerable users and specialist premises in product selection and management.
What should an owner or manager record?
Record each valve’s location, manufacturer, model, served outlet and installation details. Link results and open actions to individual references rather than relying on a building-wide statement that bathrooms were checked.
Arrange access suitable for the required work on concealed valves without unnecessary damage to surrounding finishes. Define relevant testing, cleaning or component attention and record results and any restrictions.
Frequently asked questions
Does a TMV prevent legionella growth?
No. A TMV controls mixed-water temperature; it does not disinfect the system or replace hygiene controls. Storage, distribution, use and monitoring remain matters for the risk assessment and control programme.
Can every TMV be used in a care environment?
No. Match the valve to application, assessed risk and vulnerable-user requirements. Physical compatibility with the pipework alone does not establish suitability.
Does a steady temperature mean the valve has passed its service?
No. A stable reading cannot replace specified service and functional tests. Record method, checks and whether criteria were met; investigate unexpected temperature or performance changes.
Related reading and support
Read how often TMVs should be serviced and what a legionella risk assessment covers. Connect TMV servicing and testing to the wider maintenance programme, or discuss an outlet or system with valve and system details.
