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Commercial maintenance

TMV testing and servicing

Annual TMV2/TMV3 thermostatic mixing valve testing in care homes, schools, and healthcare settings.

Thermostatic Mixing Valves are mandatory safety devices anywhere there's a risk of scalding to vulnerable users, care homes, hospitals, schools, nurseries, accessible bathrooms in commercial properties. They blend hot and cold water to a safe outlet temperature (typically 41°C for healthcare basins, 43–46°C for showers/baths) and must be tested annually to verify they are still functioning safely.

Our team provides annual TMV testing programmes, servicing, replacement and certification across London, single sites, multi-site portfolios and integrated water hygiene programmes alongside Legionella compliance.

Need this service in London?
When We Use This

Where this service applies

  • NHS / private healthcare HTM 04-01 / D08 compliance
  • Care homes (CQC inspection requirements)
  • Schools and nurseries (Ofsted-relevant)
  • Hotels with TMV-protected accessible rooms
  • HMO bathrooms (where local authority requires)
  • Commercial offices with healthcare-grade washrooms
  • TMV replacement when failed annual test
  • TMV2 (domestic-grade) and TMV3 (healthcare-grade) servicing
Our Process

How we deliver

  1. 1

    Site visit & valve identification
    All TMVs catalogued. Type, location, age recorded.

  2. 2

    Cold-water failure test
    Cold supply isolated, valve tested for safe failure to cold within 5 seconds (TMV3 requirement).

  3. 3

    Outlet temperature verification
    Calibrated thermometer at outlet. Reading within tolerance band.

  4. 4

    Hot-water failure check
    Where supplied with backflow-prevented hot, hot-only failure verified.

  5. 5

    Mechanical service
    Strainer cleaned, cartridge serviced or replaced as needed.

  6. 6

    Certificate issued
    Annual TMV compliance certificate per BuildCert TMV3 standard.

  7. 7

    Asset register update
    Online register of all TMVs with service history.

Frequently Asked

Your questions answered

Where are TMVs legally required?
Wherever there's a foreseeable risk of scalding to vulnerable users. Required by NHS HTM 04-01/D08 in all healthcare settings. Required in care homes by CQC. Required in schools where pupils have access to hot water taps. Required in HMOs by some local authority licensing schemes. Best practice in any accessible bathroom.
How often must TMVs be tested?
Annually as standard. Healthcare and care homes test more frequently in some cases (6-monthly in NHS settings depending on risk register). Records must be retained for at least 5 years and produced on inspection.
How much does TMV testing cost in London?
Priced per our published rate card (see full pricing). Service contracts (multi-site, scheduled) priced per visit. Includes calibrated test, written certificate and asset register update.
What's the difference between TMV2 and TMV3?
TMV2: Standard domestic/commercial valves designed for normal-risk situations (typical bathrooms). TMV3: Healthcare-grade valves with additional safety requirements (faster cold-failure response) for high-risk settings (hospitals, care homes, mental health units). TMV3 is mandatory in NHS HTM 04-01/D08 settings.
Do you supply and fit replacement TMVs?
Yes, failed TMVs replaced same-day on most call-outs, priced after a free on-site consultation and a written fixed-price quote, with no obligation. Brand options include Rada, Reliance, Honeywell Braukmann, Pegler, Inta.