Your Trusted Partner for TMV Servicing
Thermostatic mixing valves help control hot water temperatures at taps, showers and outlets. When they are not serviced properly, temperatures can drift over time. This can increase the risk of scalding, user complaints and non-compliance with water safety guidance.
TMV servicing checks that each valve is working safely and responding as it should. It helps make sure hot and cold water are blended correctly, especially in buildings where vulnerable users may be present.
At Titan Water, we provide professional TMV testing and maintenance for healthcare, education, commercial and industrial buildings across the UK. Our engineers test, clean, calibrate and record each valve in line with current guidance, including HSG274 Part 2 and NHS Model Engineering Specification requirements.
Our approach is simple and transparent. We check temperature accuracy, response times and failsafe operation. We also carry out cleaning, servicing and repairs where needed. You receive clear records for your compliance files, planned maintenance programme or risk assessment.
Nationwide Service
Reliable Expertise Wherever You Are
Our experienced team works from Titan Water’s head office near Liverpool, with engineers covering the North West and many other areas of the UK.
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Our engineers carry out TMV maintenance and replacement works in places such as London, Liverpool, Manchester, Birmingham, Newcastle, Scotland and Wales.
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Whether you are dealing with scaling, temperature faults or a planned maintenance schedule, we can help with clear, practical advice.
Your Questions Answered
What Is TMV Servicing?
Thermostatic mixing valve servicing is the process of checking, cleaning and adjusting thermostatic mixing valves. The aim is simple: to make sure they deliver safe, stable hot water.
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TMVs blend hot and cold water to reduce the risk of scalding. When they are not maintained, they can become stiff, scaled or slow to respond.
A TMV service helps to:
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Keep hot water temperatures within safe limits
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Reduce the risk of scalding
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Check that failsafe functions work properly
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Support compliance with HSG274, NHS MES and risk assessment requirements
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To learn more about TMV's, visit our blog: What Does TMV Stand For?
TMV Maintenance Explained
TMV maintenance is the routine care carried out between full services. It helps keep valves working properly and allows small issues to be spotted early.
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This can reduce call outs, improve temperature control and support safer hot water delivery.
Typical TMV Maintenance Checks:
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Visual checks for leaks, damage, or tampering
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Outlet temperature spot checks at representative outlets
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Simple cleaning of external strainers where fitted
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Confirming isolation valves are usable and accessible
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Reviewing recent risk assessment notes and previous results
TMV Maintenance vs TMV Servicing
TMV maintenance helps keep the valve working between full services.
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TMV servicing is more detailed. It usually includes inspection, cleaning, descaling, recalibration, failsafe testing and records.
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How Often Should TMVs Be Serviced?
Most TMVs should be serviced at least once a year. Some sites need more frequent checks, especially healthcare buildings, schools, nurseries and other settings with vulnerable users.
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The right frequency should be based on your risk assessment, building type and manufacturer guidance.
You should arrange servicing if:
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Outlets exceed safe temperature limits.
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Users report fluctuating or inconsistent temperatures.
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The valve has become stiff, slow to react, or blocked with scale.
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A Legionella risk assessment recommends a TMV service or more frequent checks.
Regular servicing helps prevent scalding incidents, keeps you compliant, and improves user safety across your building. Find out how often TMVs should be serviced in our detailed guide - How Often Should TMV's Be Serviced | Titan Water.
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Compliance, Safety and Regulation
TMVs are an important part of water safety in many buildings. They help control hot water temperatures and reduce the risk of scalding.
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In the UK, TMV installation, testing and maintenance are supported by guidance such as HSG274 Part 2, NHS engineering standards and the Water Supply (Water Fittings) Regulations.
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Regular servicing and clear records help show that your system is being managed properly.
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What’s Involved in the TMV Servicing Process?
A professional thermostatic valve service includes:
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Temperature testing – Checking outlet temperatures before and after servicing.
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Internal cleaning and descaling – Removing debris, scale, and biofilm from internal mechanisms using appropriate descaler and disinfectant where required.
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Replacement of worn components – Cartridges, strainers, or seals if necessary.
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Recalibration – Adjusting the valve to achieve the correct blended temperature.
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Failsafe verification – Ensuring the valve reacts correctly if hot or cold feed fails.
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Flow rate check - Servicing also includes checking the flow rate at outlets to ensure the valve is operating correctly and delivering water within acceptable performance limits.
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Record keeping – Providing clear results for compliance and audit purposes.
Most servicing is completed with minimal disruption, and immediate repairs can usually be carried out on the spot.
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See our blog post How To Service a TMV for further insight on the servicing process.
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What Is the Difference Between TMV Failsafe Testing and TMV Servicing?
TMV failsafe testing and the full servicing of a TMV are linked, but they are not the same.
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Fail safe testing checks that the valve shuts down correctly if the cold water supply fails. This helps reduce the risk of scalding.
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Thermostatic mixer valve servicing is a fuller process. It includes temperature checks, cleaning, descaling, lubrication, recalibration and failsafe testing.
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In simple terms:
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Failsafe testing checks one critical safety function
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TMV servicing checks, cleans and adjusts the valve properly
A full TMV service should include failsafe testing, but failsafe testing alone does not replace routine servicing.
What Our Clients Say
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Frequently Asked Questions
How much does TMV servicing cost?
The cost depends on the number of valves, access, condition and whether any parts are needed. A standard service is usually priced per valve, but heavy scale, awkward access or repair work can increase the cost.
Is TMV servicing a legal requirement in the UK?
Servicing your TMV is often required as part of your wider water safety duties. In higher risk environments such as healthcare, care homes, schools and nurseries, regular checks are expected under guidance such as HSG274 Part 2 and HTM 04-01.
How long does a TMV typically last before it needs replacement?
A thermostatic mixing valve can last many years if maintained correctly, but its lifespan depends on water quality, usage patterns and how consistently maintenance has been carried out. In normal water conditions with routine servicing, valves can often last 5–7 years or more. Hard water and heavy usage will shorten this.
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What is the difference between a TMV2 and a TMV3?
TMV2 valves are designed for domestic settings such as private housing. TMV3 valves are tested to higher standards and are typically required in healthcare, education and commercial buildings where users may be more vulnerable and stricter temperature control is needed. For further reading, take a look at our dedicated blog - Difference Between TMV2 and TMV3 | Titan Water.
How long does a TMV service visit usually take?
Most individual TMV services can be completed within a few hours, depending on accessibility and how many valves are being assessed. If a valve requires replacement parts or additional work is found during inspection, this can extend the visit.
Can I do TMV servicing myself?
Simple visual checks and temperature spot checks can be done in-house. Full servicing should be carried out by a trained person. This includes cleaning, descaling, recalibration and failsafe testing.
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What is the difference between an RPZ valve and a TMV?
A TMV controls water temperature at outlets to reduce scalding risk. An RPZ valve prevents backflow and protects the mains water supply from contamination. They perform different safety functions and are tested and maintained under separate regulations. Read our article that expands on the subject. The Difference Between a TMV and an RPZ Valve | Titan Water
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Speak to an Expert
If you need support with TMV servicing, or want to discuss temperature checks, valve performance, or planned maintenance, you can speak directly with our team. We can help you understand what level of servicing is appropriate for your system and how it fits into your wider water hygiene responsibilities.
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Case Studies
When a thermostatic mixing valve begins to drift out of tolerance, it is usually a sign that the valve or the wider system is no longer performing as it should. At Titan, our engineers specialise in identifying these faults early and putting in place practical solutions that restore both safety and reliability.
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Take a look at our ‘TMV Replacement Case Study’ to see how we approach real world challenges when TMV's fail, from diagnosing underlying issues to delivering clean, compliant installations that stand the test of time.
