TMV Thermostatic Mixing Valve Servicing & Maintenance

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Why Do TMV Thermostatic Mixing Valves Need Servicing?

Regular servicing of TMV (Thermostatic Mixing Valves) is essential for safety, efficiency, and compliance. At Flowsafe, our Specialist Legionella Services ensure your TMVs operate correctly, reducing risks and maintaining optimal performance. Here are key reasons why TMV servicing is crucial:

  • Ensures Safe Water Temperatures – Verifies that water does not exceed 44°C, preventing scalding risks.

  • Confirms Fail-Safe Operation – Checks that the valve shuts off correctly in case of cold water supply failure.

  • Prevents Legionella Growth – Reduces the risk of bacterial buildup in TMV filters.

  • Protects Against Legionnaires’ Disease – Minimises exposure to harmful bacteria, safeguarding health.

TMV Thermostatic Mixing Valve Service & Maintenance

A Thermostatic Mixing Valve (TMV) service and maintenance by Flowsafe involves thorough cleaning, disinfection, and failsafe testing of the TMV valve. These valves play a critical role in protecting vulnerable individuals, such as the elderly, young children, and those with disabilities, from scalding injuries by blending hot and cold water to deliver a safe, controlled temperature between 38°C and 46°C, depending on the outlet type and installation environment.

To prevent Legionella bacteria from breeding, hot water must be stored at 60°C. However, this increases the risk of scalding, particularly for vulnerable individuals. According to HSG 274 Part 2 – The control of legionella bacteria in hot and cold water systems, the average person can suffer scalding at 50°C, while vulnerable individuals face a much higher risk at just 44°C.

What Happens During a TMV Thermostatic Mixing Valve Service by Flowsafe?

During a TMV service by Flowsafe, our specialists may encounter various issues—some requiring simple adjustments, while others may need more extensive repairs or a follow-up visit. Below, we outline the key aspects of our TMV servicing process.

  • ✔ Temperature Adjustment – Ensuring water temperatures are within the compliant range (38-46°C, depending on the outlet).
    ✔ Filter Cleaning – Removing debris and scale from TMV filters to prevent Legionella growth and maintain optimal flow rates.
    ✔ Failsafe Test – Verifying the TMV shuts off correctly if the cold supply fails, preventing scalding risks.


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  • 🔧 Improving Accessibility – Modifying installations for easier future maintenance.
    🔧 Installing Isolation Valves – Allowing for safer and more efficient servicing.
    ⚠ Failed Failsafe Replacement – If the failsafe mechanism is faulty, we ensure it is repaired or replaced to maintain safety.scription text goes here

    • Basins: 38-43°C

    • Showers: 41°C

    • Unassisted Baths: 38-44°C

    • Assisted Baths: 38-46°C

What Legionella Services are there?

Legionella Schematic Drawing

Legionella Risk Assessment

TMV Servicing

Legionella Remote Monitoring

Legionella Testing

Expansion Vessel Flushing

Legionella Remedial Works

Water Safety Signs

Legionella Free Legionella Audit

Legionella Monitoring

Legionella Testing Kit

Pump Servicing

When and how often must you do TMV Thermostatic Mixing Valve Servicing?

At Flowsafe, we ensure that Thermostatic Mixing Valve (TMV) servicing and maintenance is carried out in full compliance with HSG 274 – p.2.164, which states:

"Where the risk assessment deems TMVs necessary, strainers or filters should be inspected, cleaned, descaled, and disinfected annually—or at a frequency determined by the risk assessment, considering any manufacturer recommendations."

Many service providers offer limited options, such as:

  • Annual TMV servicing with failsafe checks

  • Annual TMV servicing plus six-monthly failsafe inspections.

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Founded in 2024, Flowsafe Compliance Water Hygiene Services is built on over 10 years of personal industry experience, delivering trusted water treatment solutions for homes and businesses across the UK.

With a strong focus on quick response, reliability, and tailored service, we offer expert Legionella control and water hygiene solutions designed to ensure safe, clean water where it matters most. Our approach is hands-on, professional, and fully aligned with current industry standards and regulations.

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