TMV testing ensures thermostatic mixing valves operate safely and correctly to control water temperatures and reduce the risk of scalding and Legionella growth. Regular inspection, testing and servicing of TMVs is essential to maintain compliance with Building Regulations, HTM guidance and water hygiene best practice.
What is a TMV (Thermostatic Mixer Valve)?
TMV or Thermostatic Mixer Valve is a device that is designed to control water temperature for showers, baths and outlets. These devices require servicing on a regular bases in order for them to function correctly. Maintenance schedules should take into account local conditions (for example hard water or limescale) and the risk of valve failure.
Temperature Control & Legionella Prevention
All water services should be operated at temperatures that prevent Legionella growth: Hot water storage cylinders (calorifiers) should store water at 60°C or higher; Hot water should be distributed at 50°C or higher (thermostatic mixer valves need to be fitted as close as possible to outlets, where a scald risk is identified); and Cold water should be stored and distributed below 20°C.
Fail-Safe Testing & Servicing Requirements
It is a requirement that all TMVs are fail checked regularly depending on your organisation to ensure they are still achieving the desired temperature. If temperature control fluctuates more than 2 degrees from the original setting then a full service will be required.
All TMVs are tested to Building Regulations (Part G, 3.66 - Prevention of Scalding), BS EN 1111, BS EN 1287 and Health Technical Memorandum HTM 04-01 - Performance specification D 08: thermostatic mixing valves (healthcare premises) regulations and guidelines. All testing instruments are UKAS calibrated to national standards and copies of certification are supplied with reports.
Our engineers are not only fully trained in carrying out TMV testing, but also in ensuring the safety of everyone whilst testing is carried out. All engineers carry the CSCS passport to safety and are all enhanced DBS checked to ensure confidence when working on site and in areas with vulnerable people.
Our TMV (Thermostatic Mixing Valve) testing service includes:
Why Choose Us ?
Our collaborative and proactive approach drives efficiency, cost savings and offers our clients peace of mind. We are committed to continuous improvement, through innovation and investment in our personnel, methodologies and equipment.
We offer extremely competitive rates and daytime or evenings to offer minimal disturbance to our customers.
TMV FAQ’s
What is TMV testing?
TMV testing checks that thermostatic mixing valves control outlet temperatures correctly and operate safely to prevent scalding and Legionella risk.
How often should TMVs be tested?
Testing frequency depends on risk and usage, but TMVs should be fail-safe tested regularly in line with organisational procedures and guidance.
What happens if a TMV fails a temperature test?
If temperature varies by more than ±2°C from the set point, a full service and clean is required.
Which standards apply to TMV testing?
TMV testing is carried out in line with Building Regulations Part G, BS EN 1111, BS EN 1287 and HTM 04-01.
Are reports provided after testing?
Yes. Full written reports are supplied, including findings, calibration details and recommendations.
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