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TMV Servicing

Maintenance and Failsafe Testing

Acorn Environment Services is a leading water treatment and environmental services company offering a comprehensive range of expert water treatment, legionella control, health and safety compliance and engineering support solutions including the maintenance of thermostatic mixing valves (TMVs), TMV servicing, temperature monitoring and failsafe testing in health and social care facilities including hospitals, care homes and other premises where the risk of scalding from hot water requires the installation and regular maintenance of thermostatic mixing valves.

Our specialist water hygiene, legionella control, health and safety compliance and engineering support capabilities allow us to offer a range of expert services including the installation and replacement of thermostatic mixing valves, TMV servicing (including valve and fine mesh strainer cleaning, descaling and disinfection), temperature monitoring and failsafe testing to ensure good water quality standards, safe water temperatures and health and safety standards are achieved and maintained.

Our TMV servicing solutions are delivered by experienced, in-field water treatment and engineering experts who combine the latest testing equipment, high performance disinfectants and engineering components to ensure TMVs are maintained, serviced and tested regularly to ensure their correct operation.

Contact Acorn today to discuss a water management programme for your property.

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Call 0161 483 7112 to book an appointment. Available 24/7

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Controlling legionella with elevated water temperatures.

Within hospitals, healthcare, social care and similar settings the primary means of controlling the growth and proliferation of Legionella bacteria in hot water systems is by thermal control, which involves using elevated water temperatures. Current guidance set by the Department of Health in their “Health technical memorandum HTM 04-01: Safe water in healthcare premises” states that hot water should be stored at a minimum of 60°C and dispensed at a minimum of 55°C.

If hot water used for showering or bathing is above 44 °C then there is a significant risk of serious injury or even fatality, especially where large areas of the body are exposed to high temperatures. Such elevated water temperatures therefore need to be carefully controlled and managed, especially where those at higher risk of scalding injury are exposed.

What is a thermostatic mixing valve (TMV)?

A thermostatic mixing valve (TMV) is a specially designed plumbing valve that carefully mixes hot and cold water to control hot water outlet temperatures to safe levels. TMVs are used in health and social care environments to protect people by reducing the risk of scalding from very hot water from showers, baths and wash hand basins.

How does a TMV work?

TMVs are precision mechanical valves that are designed to regulate and maintain water temperatures to safe levels even when water pressures or flow rates fluctuate.

How do they work? As hot and cold water enters the mixing valve it is carefully blended using an internal thermal element to output a mixed water stream at a pre-set temperature that is typically between 39°C and 43°C. This is the recommended temperature range for hot water outlets where a TMV is installed.

TMVs also incorporate an essential failsafe mechanism that will automatically shut down the valve if either the cold water or hot water supplies fail. This ensures that people are protected from dangerously high hot water temperatures (interrupted cold water supply), and thermal shock from cold water (interrupted hot water supply).

TMV servicing & maintenance… What does it involve?

VISUAL INSPECTION- Examine each TMV to identify if the correct specification valve is fitted, good accessibility and if isolation valves are fitted.
WATER TEMPERATURE- Measure and record the mixed water temperature to ensure it is between 39°C and 43°C.
TMV FAILSAFE TEST- Perform an in-service TMV failsafe shut-off test, isolating the cold water supply.
CLEAN, DESCALE & DISINFECT- Isolate each TMV and clean, descale and disinfect valve components and fine mesh strainers.

How Can We Help?

Frequently Asked Questions

Yes, by managing systems where legionella is most likely found. Secondly, contacting a professional who can complete treatment on sources where the risk of legionella is high is also advised.

Legionnaires’ disease can be contracted when water droplets containing Legionella bacteria enter a person’s lungs.

There is currently no cap on fines for Legionella. However, examples show companies being fined nearly £2 million after failing a legionella test

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