AAC Gas provide specialist TMV servicing and Legionella remedial correction works across the North of England. Based in Higher Walton, Preston, our engineers carry out thermostatic mixing valve testing, servicing, and replacement alongside Legionella remedial correction works for care homes, nursing homes, schools, hospitals, and commercial premises across Preston, Lancashire, Manchester, Merseyside, Cheshire, Cumbria, Yorkshire, and all surrounding areas.

TMV servicing and Legionella remedial correction is a specialist service that most commercial gas engineers do not offer. It is a natural extension of the commercial gas and heating services we provide to care homes, schools, and healthcare facilities across the North of England — and it sets AAC Gas apart as a genuinely comprehensive commercial building services contractor for the regulated care and education sectors.

📞 Call us: 01772 382971 — appointments available across the North of England

What Is a Thermostatic Mixing Valve?

A thermostatic mixing valve (TMV) is a safety device installed on hot water outlets in care homes, hospitals, schools, and other premises where vulnerable people may be exposed to hot water. A TMV blends hot and cold water to deliver a safe, consistent outlet temperature — typically 38°C to 43°C at a washbasin or 41°C to 46°C at a bath or shower — preventing scalding injuries to residents, patients, and service users who may not be able to react quickly to hot water.TMVs are required under:

• HSE guidance HSG274 — Legionella guidance for water systems
• HTM 04-01 — Safe water in healthcare premises
• Building Regulations Part G
• The Health and Social Care Act 2008 (Regulated Activities) Regulations 2014 — CQC regulatory framework

For care homes and healthcare facilities across the North of England, correctly installed and regularly serviced TMVs are a CQC compliance requirement — not optional.

Our TMV Services

Annual TMV Servicing & Testing

TMVs require annual servicing and testing to maintain correct function and comply with current guidance. Over time, TMVs can fail to maintain correct temperature, fail safe (shutting off if cold water supply fails — preventing scalding), or become blocked with scale and debris — particularly in hard water areas.Every annual TMV service includes:

• Temperature check at each TMV outlet — verified against current guidance limits
• Fail safe test — cold water supply isolated to verify TMV shuts off correctly
• Isolation valve operation checked
• Strainer and filter inspection and cleaning
• TMV body inspection — condition assessed, signs of deterioration or scale noted
• Temperature blending performance verified
• Full written service record issued on completion — suitable for CQC inspection

TMV Replacement

Where TMVs are found to be failing, beyond economical repair, or no longer performing correctly, we carry out like-for-like replacements across the North of England. We work with all major TMV manufacturers and can source and install replacement units quickly to minimise disruption to care environments.Brands covered: Horne · Delabie · Pegler · Reliance Water Controls · Rada · Mitigeur · Thermostatic Mixing Valve manufacturers and all major brands.

New TMV Installation

We carry out new TMV installations for care homes, nursing homes, schools, and healthcare facilities across the North of England — including new build projects, refurbishment works, and compliance upgrade programmes where TMVs are being retrofitted to existing hot water systems.All installations carried out to current HTM 04-01 and HSG274 guidance with full commissioning documentation provided.

What Is Legionella Remedial Correction?

Legionella bacteria thrive in water systems where temperatures allow — typically between 20°C and 45°C — and where conditions such as stagnation, scale, biofilm, or sediment provide a suitable environment for growth. Legionnaires' disease is a serious and potentially fatal form of pneumonia caused by inhaling water droplets containing Legionella bacteria.

Under the Health and Safety at Work Act 1974 and the Control of Substances Hazardous to Health Regulations 2002 (COSHH), all employers have a legal duty to assess and control the risk of Legionella in their water systems. For care homes and healthcare facilities, this obligation is particularly critical given the vulnerability of residents and patients.

A Legionella Risk Assessment identifies the control measures required to manage Legionella risk in a water system. Where the risk assessment identifies deficiencies — such as incorrect water temperatures, stagnant water in dead legs, inadequate TMV provision, or system design issues — Legionella remedial correction works are required to address those deficiencies.

Our Legionella Remedial Correction Works

Temperature Remediation

Correct hot and cold water temperatures are the primary control measure against Legionella growth. Hot water should be stored at 60°C and distributed so that it reaches 50°C at all outlets within one minute. Cold water should be maintained below 20°C.

Where a Legionella risk assessment has identified temperature failures — hot water not reaching correct temperatures, cold water running warm — we carry out the engineering works required to restore correct system temperatures. This typically includes:

• Boiler and calorifier temperature checking and adjustment
• Hot water circulation pump servicing and commissioning
• Dead leg removal or modification
• Insulation improvements
• Cold water tank assessment and remediation

Dead Leg Removal and System Modifications

Dead legs — sections of pipework with no through-flow — are a primary Legionella risk in any water system. Stagnant water in dead legs quickly reaches temperatures that support Legionella growth. We carry out dead leg removal and pipework modifications across care homes, schools, and commercial premises to eliminate stagnant water from water systems.

Calorifier and Water Heater Servicing

Commercial calorifiers and water heaters require regular servicing to maintain correct temperatures and prevent Legionella risk. We service commercial calorifiers and water heaters across the North of England — including:

• Temperature verification
• Thermostat calibration and replacement
• Immersion heater testing
• Drain and flush where required
• Full service documentation

Thermal Disinfection

Where Legionella contamination is identified or suspected, thermal disinfection of the water system — raising the water temperature to 70°C and flushing all outlets — may be required as an immediate control measure. We carry out thermal disinfection programmes across care homes and commercial premises across the North of England.

Water System Documentation and Compliance Records

Following remedial correction works, we provide full written documentation of all works carried out — suitable for inclusion in the premises Legionella control log and available for inspection by the CQC, HSE, or environmental health authorities.

Who Needs TMV Servicing & Legionella Remedial Correction

Care Homes and Nursing Homes

Care homes and nursing homes across the North of England have the most critical TMV and Legionella compliance obligations of any commercial sector. CQC inspectors specifically assess water safety management as part of the regulatory inspection framework — and inadequate TMV provision or Legionella control measures can directly affect CQC ratings and regulatory fitness.Our DBS checked engineers carry out TMV servicing and Legionella remedial correction works in occupied care environments with minimum disruption to residents — across Preston, Lancashire, Manchester, Merseyside, Cheshire, Cumbria, and Yorkshire.

Schools and Education

Schools, academies, and colleges across the North of England have significant TMV and Legionella compliance obligations — particularly where showers, laboratory sinks, and catering facilities are involved. We provide TMV servicing and Legionella remedial correction for schools across the region, scheduling works during school holidays wherever possible.

Hospitals and Healthcare Facilities

NHS hospitals and private healthcare facilities operate under HTM 04-01 — the most stringent water safety guidance in the UK. We carry out TMV servicing and Legionella remedial correction works in healthcare environments across the North of England.

Commercial Premises

Offices, hotels, leisure facilities, and all commercial premises with hot and cold water systems have Legionella management obligations under HSG274. Where a risk assessment identifies remedial works are required, we carry out the engineering correction works to bring water systems into compliance.

Why Choose AAC Gas for TMV Servicing & Legionella Remedial Correction

• Specialist service — most commercial gas engineers do not offer TMV servicing or Legionella remedial works
• Over 20 years' experience in commercial building services
• Gas Safe registered — registration 562186
• DBS checked engineers — suitable for care homes, schools, and healthcare
• CQC-compliant documentation provided on completion
• Understanding of HTM 04-01, HSG274, and CQC regulatory requirements
• Works carried out with minimum disruption to residents and service users
• Same engineer for gas safety and TMV servicing — one trusted contractor for all compliance works
• Available across Preston, Lancashire, Manchester, Merseyside, Cheshire, Cumbria, and Yorkshire
• Competitive pricing — no hidden charges

Areas Covered

We provide TMV servicing and Legionella remedial correction across Preston, Lancashire, Manchester, Merseyside, Cheshire, Cumbria, Yorkshire, and all surrounding areas across the North of England.

View all areas we cover →

Book TMV Servicing or Legionella Remedial Correction

To arrange TMV servicing, Legionella remedial correction works, or a compliance consultation for your premises anywhere across the North of England, contact AAC Gas today.

📞 Call: 01772 382971 

🌐 aacgas.co.uk 

📍 Higher Walton, Preston, Lancashire 

🔒 Gas Safe registered — 562186

CALL US NOW!