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TMV Servicing

Keep your business compliant with professional TMV servicing from Acorn. Backed by 30 years’ experience and LCA membership, we provide TMV fail-safe testing, temperature checks and thorough reports, reducing scalding and Legionella risks and keeping your premises audit-ready.

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What is TMV Servicing?

TMV Servicing is the planned inspection, testing, and maintenance of Thermostatic Mixing Valves (TMVs) within a building’s water system. TMVs blend hot and cold water to deliver it at a controlled outlet temperature, reducing the risk of scalding when using taps, showers, baths, and wash basins.

Over time, scale, debris, and biofilm can affect temperature control and water hygiene standards – professional TMV servicing confirms each valve is working safely and in line with your site’s risk assessment. This can include:

Fail-safe testing
Cleaning
Descaling
Disinfection
Calibration

For duty holders, routine TMV servicing provides documented evidence that water outlets are being managed safely, protecting building users and supporting wider water hygiene compliance.

Why does regular TMV servicing matter?

Regular TMV servicing matters as it protects building users from scalding temperatures and issues arising from poor water hygiene. This is especially important in places like care homes, schools, leisure centres, and managed commercial properties, where vulnerable people need greater levels of care.

Without planned TMV maintenance, valves can be affected by scale, debris, and restricted water flow. This can affect water temperature control and increase the likelihood of scalding from unsafe performance.

Poorly maintained blended water outlets can also increase the risk of Legionella. This can be carefully managed as part of a Legionella testing and control programme in line with ACOP L8 and HSG 274 regulations.

How often should TMVs be serviced?

TMVs should be serviced every 6–12 months, depending on a number of factors, including:

Property risk (e.g., usage levels)
Your current risk assessment
Manufacturer guidance
Your water safety plan
Vulnerability of building users
Valve conditions

For many commercial premises, annual TMV servicing offers a good baseline for any planned preventative maintenance, though higher-risk environments (e.g., care homes, healthcare buildings, schools) may need more frequent testing.

Book your TMV servicing

Legionella Bacteria and the role of temperature

Does TMV servicing help with Legionella compliance?

Yes, TMV servicing can help you stay Legionella compliant because TMVs are part of a building’s hot and cold water system. As they’re close to the outlet, TMVs can allow scale, debris, and stagnant water to build up within the pipework – potentially creating conditions for Legionella to thrive.

This can be managed as part of a wider water hygiene programme, which includes inspection, temperature checks, strainer cleaning, descaling, and more. We offer an all-in-one water hygiene maintenance service that keeps you audit-ready in line with ACOP L8 and HSG 274 regulations. This includes:

As part of our water hygiene service, everything is documented in a personalised ServiceTracker digital report for clear compliance evidence.

Who needs professional TMV servicing?

Any premises responsible for managing safe hot and cold water systems need professional TMV servicing. We support facilities managers and duty holders with commercial TMV servicing across a range of businesses, including:

Care and healthcare settings

Support safer bathing, washing and welfare facilities in environments where people may be more vulnerable to hot water injuries. Professional TMV servicing helps care homes, clinics, dental practices and supported living settings manage scalding risk, infection control expectations and welfare standards, including CQC requirements where relevant.

Education and childcare

Keep outlet temperatures controlled across washrooms, canteens, changing areas and staff facilities. TMV servicing supports duty of care and safeguarding in schools, nurseries and other education settings where children, pupils and staff rely on safe hot water every day.

Hospitality and accommodation

Keep guests safe across hotels, holiday parks and multi-unit accommodation sites with regular TMV servicing for bathrooms, shared facilities and welfare areas. This is especially important where seasonal use, high occupancy and multiple outlets can place extra pressure on hot water systems.

Leisure and public facilities

Protect public users and reduce disruption across high-use showers, changing rooms and washrooms. Regular TMV servicing helps leisure centres, gyms, spas and sports facilities keep facilities safer, more reliable and ready for daily use.

Offices and commercial buildings

Reduce workplace risk across staff kitchens, washrooms, welfare areas and shared facilities. Professional TMV servicing helps offices, retail units, shared workspaces and commercial buildings keep hot water outlets working safely and avoid unplanned maintenance issues.

What is our TMV servicing process?

From initial inspection to final reporting, our 3-step process makes TMV maintenance simple to manage across commercial properties and care environments.

Step 1: Inspection & temperature check

We start by visually inspecting each TMV to assess its condition and any visible signs of wear or damage. We then complete inlet and outlet temperature checks to confirm the valves are blending hot and cold water correctly.

Step 2: Clean, descale, & fail-safe test

Where needed, we carry out TMV cleaning, descaling, and disinfection to help remove scale and debris build-up. We also complete TMV fail-safe testing to see if the valve responds well to an interrupted cold water supply.

Step 3: Report, recommend, and record

After servicing, we provide a digital service report with temperature readings, test results, and any recommended corrective works. These are sent directly to you and uploaded to your client portal via ServiceTracker for a clear audit trail.

Book your free TMV test

If you need reliable TMV testing, start today with Acorn. Get in touch for next steps on how to get compliant with ACoP L8 and HSG 274 regulations. Whether you’re planning routine monitoring or responding to a health and safety concern, we’ll check your water system at a time that best suits you.

0161 483 7112

Why choose Acorn for your TMV servicing?

Clear compliance you can rely on

Our TMV servicing is carried out in line with ACoP L8 and HSG 274, giving you clear evidence that risks are being properly assessed and controlled if insurers, auditors, or authorities ask.

30+ years of water hygiene expertise

All Legionella water testing is carried out by trained engineers with over 30 years’ experience in water hygiene, accredited by the Legionella Control Association (LCA).

Audit-ready reports when you need

Your results and documentation are stored securely in a digital client portal, giving you instant access to Legionella compliance evidence for audits, inspections, or internal checks.

Fast, local support across the North

You get responsive TMV servicing across the North West and Yorkshire – as well as key areas across London and Bristol – with quick turnaround on sampling and paperwork when issues need dealing with quickly.

Book your TMV servicing

Check out our water hygiene accreditations

What do our clients think about our TMV testing service?

K

"I had a great experience with Acorn Environment Services. From the first call to the completed service, the team was professional, knowledgeable, and friendly. They took the time to explain the issue, walked me through the treatment plan, and answered all my questions. The service was prompt, thorough, and effective—I noticed a huge improvement right away"

Katie Markey

N

"I couldn't recommend Acorn highly enough, I've used them for over 3 years on my portfolio. Nothing is to big or to small, reporting is excellent and I've had operatives onsite in less than an hour when required. Acorn are my go to for pest control, jetwashing, tree services and biological clean up. They really go the extra mile whenever needed!"

Nathan Markey

H

"We’ve been using this company for water hygiene tests and couldn’t be happier with the service. The team is always punctual, professional, and very thorough in their checks. Reports are clear, detailed, and provided promptly, which gives us real peace of mind that we’re fully compliant."

Holly Turner

TMV servicing FAQs

How often should TMVs be serviced?

TMVs should usually be serviced every 6 to 12 months, depending on the building type, risk assessment, manufacturer guidance and the vulnerability of users. Higher-risk settings, such as care homes, schools, healthcare premises, leisure centres and public buildings, may need more frequent TMV testing to maintain safe outlet temperatures and accurate compliance records.

What is included in TMV servicing?

TMV servicing usually includes a visual inspection, inlet and outlet temperature checks, fail-safe testing, cleaning, descaling and strainer checks. Where required, our engineers may also disinfect components, adjust or calibrate the valve, identify faults and recommend corrective works.

Does TMV servicing help with Legionella compliance?

Yes, TMV servicing helps with Legionella compliance because Thermostatic Mixing Valves form part of a building’s hot and cold water system. Poorly maintained TMVs can collect scale, debris or stagnant water, which should be managed through Legionella risk assessments, temperature monitoring, cleaning, descaling and planned water hygiene maintenance.

Who needs commercial TMV servicing?

Commercial TMV servicing is needed by any organisation responsible for safe hot and cold water systems. This includes care homes, schools, nurseries, leisure centres, hotels, holiday parks, offices, healthcare-adjacent environments and managed property portfolios. TMV maintenance is especially important where vulnerable people may use taps, showers, baths or wash hand basins.

What is TMV fail-safe testing?

TMV fail-safe testing checks whether a Thermostatic Mixing Valve (TMV) responds correctly if the cold water supply is interrupted. The valve should shut down or limit the flow of hot water to the outlet during a TMV fail-safe test, which prevents dangerously high water temperatures from reaching taps, showers, or baths. This is especially important in premises where vulnerable users may be at greater risk of scalding – such as care homes, schools, and hospitals.

Request your TMV servicing quote now

If you need reliable TMV servicing, start today with Acorn. Get in touch for next steps on how to stay compliant with UK water hygiene regulations.

Whether you’re planning routine monitoring or responding to a health and safety concern, we’ll check your water system at a time that best suits you.

Book your free consultation with one of our water hygiene specialists today

Call 0161 483 7112

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