t TMV Service, we help you maintain the safety and reliability of your thermostatic mixing valves across healthcare, hospitality, and residential properties.

Our dedicated team ensures your TMVs deliver water at precisely controlled temperatures, reducing scald risk and keeping your plumbing indemnified. We carry out thorough inspections, precise adjustments, and comprehensive tests so you can have total peace of mind.

Having a regular TMV Service helps avoid costly downtime, supports compliance with safety regulations, and ensures continuous protection for everyone using your water systems.

Why is Regular TMV Servicing Important?

Regular TMV servicing is essential for maintaining safe water temperatures, preventing bacterial growth, and ensuring compliance with UK health and safety regulations.

• Prevents Scalding – TMVs regulate hot water to a safe outlet temperature. Over time, scale buildup or component wear can cause temperature drift, increasing the risk of scalding. Regular servicing ensures precise temperature control and user protection.
• Controls Legionella Growth – Poorly maintained TMVs can harbour bacteria, including Legionella. Routine cleaning, descaling, and flushing prevent bacterial buildup and safeguard against waterborne disease.
• Ensures Legal Compliance – UK regulations such as Building Regulations Part G, HSG274 Part 2, and HTM 04-01 require regular TMV testing and maintenance. Servicing provides documented proof of compliance for audits and inspections.
• Maintains System Efficiency – Clean and calibrated TMVs improve flow rates and maintain consistent water temperature, reducing system strain and extending valve lifespan.
• Reduces Long-Term Costs – Preventive maintenance helps avoid expensive repairs, replacements, and potential legal liabilities caused by unsafe water systems.

At TMV Service, we provide scheduled Thermostatic Mixing Valve servicing to keep your systems compliant, efficient, and safe. Regular TMV maintenance protects users, meets regulatory standards, and ensures long-term reliability.

How much does TMV Servicing Cost?

On average, a standard TMV service costs between £250 and £300 for a single unit, including inspection, cleaning, testing, and certification.

The cost of Thermostatic Mixing Valve servicing in the UK varies depending on the number of valves, system layout, and site access.

Contact our team to get customised prices for TMV service of your water supply systems.

What is Included in a TMV Service?

A full TMV service covers all the key checks, cleaning, and testing needed to keep your valves safe and compliant. Below is what’s included in our professional TMV servicing.

• Valve Isolation and Inspection – The water supply is safely isolated before inspection. Each valve is dismantled and checked for damage, limescale buildup, or debris that could affect performance.
• Cleaning and Descaling – All internal components, including filters, strainers, and cartridges, are cleaned and descaled. This restores correct water flow and prevents bacterial growth such as Legionella.
• Component Testing and Replacement – We test the thermostatic element, seals, and strainers for wear or malfunction. Any defective parts are replaced with genuine manufacturer-approved components to ensure reliability.
• Temperature Testing and Calibration – The TMV is reassembled and tested under normal operating conditions. Outlet temperatures are measured and adjusted to remain within the safe range (typically 41–44°C) as required by HSE and Building Regulations.
• System Flushing – We flush the valve and pipework to clear air pockets and contaminants, ensuring stable temperature and flow.
• Compliance Reporting – A full service report is provided, including temperature readings, maintenance details, and any corrective actions. A compliance certificate is issued for audit and record purposes.

Our TMV servicing process guarantees performance, safety, and compliance. Contact us to arrange a professional TMV service tailored to your site requirements.

How Often should TMVs be Serviced?

TMVs should be serviced every 6 to 12 months, depending on the type of premises and level of risk.

Regular servicing ensures accurate temperature control, prevents bacterial growth, and maintains compliance with UK safety regulations.

What are the Risks of Not Servicing a TMV?

Failing to service TMVs can lead to serious safety, legal, and operational issues, including:

• Scalding hazards – Unregulated temperatures can cause burns, especially to vulnerable users.
• Legionella risk – Inconsistent temperatures may support harmful bacteria growth.
• Valve failure – A malfunctioning TMV can stop mixing water properly or fail entirely.
• Regulatory non-compliance – Breaching HSE or building safety standards may lead to legal action.
• Reduced performance – Scale and debris buildup can compromise temperature control and flow rate.
• Unexpected downtime – Faulty valves may disrupt water supply during critical usage periods.

Are TMV Services Legally Required?

TMV servicing is a legal requirement in many UK settings to protect users from scalding and bacterial risks such as Legionella. Several regulations and standards make regular TMV maintenance mandatory.

• Building Regulations Part G – Part G requires thermostatic mixing valves to be fitted on baths in all new-build and refurbished homes. These valves must be maintained to ensure water temperatures do not exceed 48°C at the outlet.
• Health and Safety Executive (HSE) – HSG274 Part 2 – HSE guidance states that TMVs must be regularly inspected, cleaned, and tested to control Legionella bacteria. Failure to maintain valves can breach health and safety law.
• NHS Guidance – HTM 04-01 – In healthcare premises, TMV servicing is compulsory. Valves must be checked every six months to ensure outlet temperatures remain between 41°C and 44°C for patient safety.
• Care Quality Commission (CQC) Compliance – Care homes and medical facilities are legally required to maintain TMVs and keep service records. The CQC inspects this documentation during compliance audits.
• Health and Safety at Work Act 1974 – Employers and duty holders have a legal obligation to protect staff and the public from water temperature hazards. Regular TMV servicing forms part of that duty of care.

Neglecting TMV maintenance can lead to regulatory breaches, fines, or health risks.

Where are TMVs Installed?

Thermostatic Mixing Valves are installed wherever water temperature control is essential for safety, comfort, and compliance. They mix hot and cold water to a safe, stable temperature before it reaches the outlet.

• Bathrooms and Showers – TMVs are fitted to baths and showers in homes, hotels, care homes, and hospitals. They prevent scalding by regulating water temperature at the outlet.
• Wash Basins and Hand Sinks – Valves are installed under basins in schools, offices, and healthcare facilities to maintain safe handwashing temperatures, usually between 41°C and 43°C.
• Hospitals and Care Homes – In healthcare environments, TMVs are fitted on all outlets used by patients and residents. This includes baths, showers, and clinical wash stations to meet HTM 04-01 requirements.
• Educational Buildings – Schools and nurseries use TMVs on taps and sinks accessible to children. Controlled temperatures protect pupils from accidental scalding.
• Gyms, Leisure Centres, and Hotels – TMVs are installed in communal shower areas and changing facilities to provide consistent, safe water temperatures for public use.
• Domestic Properties – New-build homes and refurbishments include TMVs in bathrooms as required by Building Regulations Part G, ensuring safe bathing temperatures below 48°C.

TMVs are installed wherever people use hot water. Their placement ensures safety, compliance, and comfort across domestic, commercial, and public environments.

How Long does a TMV Service Take?

For a TMV service, every valve takes between twenty and sixty minutes, depending on its location and condition.

Most valve service work can be completed in a single visit, meaning we cause minimal disruption to your operation. If repairs or replacements are needed, we carry out additional work with your approval so your TMVs are back online as quickly as possible.

Contact TMV Service for details on TMV servicing that minimises disruption to building residents.

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