Thermostatic Mixing Valve (TMV) Testing
Thermostatic Mixing Valves (TMVs) play a critical role in protecting building users from the risk of scalding while supporting effective Legionella control within hot and cold water systems.
TMV Testing, Servicing & Descaling
At Swiftclean, we provide professional TMV testing, servicing and descaling services for commercial, healthcare, educational, residential and public sector premises as part of a comprehensive water safety management programme.
Our experienced water hygiene specialists inspect, test and maintain TMVs in accordance with current guidance, helping you demonstrate compliance, reduce risk and ensure your water systems continue to operate safely and effectively.
TMV Testing Services from Swiftclean
Our qualified engineers provide a comprehensive TMV inspection, testing and maintenance service, including:
- Asset identification and verification
- Temperature performance testing
- Fail-safe shut-off testing
- Valve servicing and maintenance
- Descaling and cleaning of internal components
- Identification of faulty or deteriorated valves
- Recommendations for remedial actions
- Detailed records and certification
All works are completed by trained water hygiene specialists and can be incorporated into a wider Legionella management programme.
Receive a Free Quote
Swiftclean commitment:
- FREE quotation and technical advice – Nationwide service
- Works carried out in accordance with Legionella Control Association guidance
- Fully trained and directly employed water hygiene engineers
- Comprehensive testing, servicing and maintenance records provided
- Site-specific risk assessments and method statements available
- TMV services integrated with Legionella Risk Assessments and monitoring programmes
- Support for healthcare, education, commercial, leisure and residential sectors
Legionella Testing FAQ’s
What Is a Thermostatic Mixing Valve?
A Thermostatic Mixing Valve (TMV) is a safety device that blends hot and cold water to deliver water at a safe, controlled temperature at outlets such as taps, showers and baths.
TMVs are designed with a fail-safe mechanism that automatically shuts off or significantly restricts the hot water supply if the cold water feed fails. This protects users from sudden temperature fluctuations and helps prevent serious scalding injuries.
TMVs are widely used in healthcare facilities, care homes, schools, leisure facilities, hotels, commercial buildings and residential properties where vulnerable users may be present.
Why Are TMVs Important?
TMVs provide an essential balance between scald prevention and Legionella control.
Superior Scalding Protection
Water temperatures capable of controlling Legionella can also cause severe burns within seconds. TMVs continuously adjust the mixture of hot and cold water to maintain a safe outlet temperature, even when pressure fluctuations occur elsewhere in the system.
If the cold water supply fails unexpectedly, the valve’s fail-safe mechanism automatically shuts off the hot water flow, protecting building occupants from accidental scalding.
Supporting Legionella Control
Legionella bacteria can multiply in water temperatures between approximately 20°C and 45°C. To minimise this risk, hot water should be stored and distributed at temperatures above 60°C.
TMVs enable water systems to operate at these Legionella control temperatures while reducing water to a safe temperature immediately before use, providing an effective solution for both water safety and user protection.
Compliance with Regulations and Standards
TMVs are often required to meet building regulations and water safety standards. In many commercial and healthcare environments, regular inspection, testing and maintenance form an important part of demonstrating compliance with water safety obligations and risk management procedures.
Do TMVs Need to Be Tested?
Yes. Regular TMV testing is essential to ensure the valve continues to operate correctly and provides effective protection against scalding.
Over time, scale build-up, wear and mechanical faults can affect performance, potentially resulting in unsafe outlet temperatures or failure of the valve’s shut-off mechanism.
Typical maintenance requirements include:
- Temperature testing
- Fail-safe testing
- Inspection of valve components
- Cleaning and descaling
- Calibration and adjustment where required
- Replacement of worn parts
As a general guide:
- Healthcare and Care Environments (TMV3 Valves) require testing and servicing every 6 months.
- Commercial, Educational and Residential Care Settings (TMV2 Valves) require testing and servicing at least annually.
The precise frequency should be determined by your Legionella Risk Assessment and the vulnerability of building users.
Should TMVs Be Included in a Legionella Risk Assessment?
Absolutely.
While TMVs are essential for preventing scalding, they also create conditions that can increase the risk of Legionella growth if not properly managed. Because TMVs blend hot and cold water, the mixed water temperature often falls within the range in which Legionella bacteria can proliferate.
For this reason, TMVs should be specifically addressed within any Legionella Risk Assessment and ongoing water safety plan.
To find out more read our blog post on TMV Servicing
Call for a FREE quote
Whether you require annual TMV testing, six-monthly healthcare compliance checks, valve servicing or support as part of your wider Legionella management programme, Swiftclean can help.
Call 0800 243 471 or contact our team today for expert advice and a free quotation.
