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Knowledge Centre Plumbing and Drainage Guides

How Often Should TMVs Be Serviced?

TMV service timing must reflect the valve instructions, application and assessed requirements of the premises. Identify each model and outlet, particularly where users are vulnerable to scalding, and confirm suitability before scheduling; monitoring, functional testing and servicing can each require their own task and evidence.

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how often should tmvs be serviced?
how often should tmvs be serviced?

Review commissioning and service findings. Instability, scale, limited flow or failed tests may call for repairs and programme changes. More frequent attendance does not correct an unsuitable installation by itself.

HSE's guidance on hot and cold water systems explains the relationship between scald protection and legionella control, including the considerations for healthcare and care premises. Apply the relevant context to valve management.

Separate the activities on the schedule

Define routine monitoring, performance testing and service tasks separately. Include manufacturer-required inspection, cleaning and component attention. Specify methods and acceptance criteria rather than accepting an unexplained pass entry.

Keep upstream supply measurements distinct from mixed-outlet readings. A comfortable outlet does not demonstrate hot-water distribution control. Connect valve tasks to the wider water-management programme without treating them as a replacement for it.

Use HSE's technical guidance, HSG274 Part 2 for the wider technical context of hot and cold water systems when establishing the programme.

Make each visit useful

Provide a referenced valve list, past findings, instructions and access plan. Identify repair authority and any temporary restrictions. Arrange alternative washing facilities where occupied areas need them during the work.

Record valve and location, completed tasks, observations, test results, repairs and unresolved items. An inaccessible valve requires a named follow-up action; do not lose it within a generally completed site visit.

Frequently asked questions

Does an annual service cover every requirement?

Not automatically. Monitoring, testing and service requirements can differ. Use valve instructions, premises-specific requirements, assessments and results to establish the full programme.

What happens if a valve fails a test?

Define the response, including continued-use decisions and necessary repair or replacement. Link failure and corrective records; a later passing test should identify the intervening work or change.

Should a new owner continue the previous schedule?

Review the inherited valve types, users, findings and alterations before adopting the programme. Keep effective arrangements operating while resolving gaps; transferred ownership does not erase open defects.

Related reading and services

Read what a thermostatic mixing valve does and water-temperature monitoring. Coordinate TMV servicing and testing with planned maintenance, or discuss your valve programme with asset references and recent findings.