66 Singlewell Road, Gravesend, Kent, DA11 7PW
TMVTesting & Servicing

Testing of the temperature for legionella should be taken on a monthly basis as per HSE guidelines.


The minimum temperature which starts to burn the skin is 45 degrees (depending on the skin condition and contact time), therefore this creates conflicting views between storing hot water at 60 degrees and the risk of scalding.

Hot water needs to be controlled by either TMV’s or warning signs. TMVs are generally used in public buildings such as hospitals, nursing homes, schools, leisure centres etc.

As the temperature is blended to below 50 degrees, testing of the temperature for legionella should be taken on a monthly basis as per HSE guidelines, all records are then submitted in the building’s logbook to show a timeline of how the water has performed.

The Requirements

According to the TMV2 scheme, it is a requirement that all TMV2 approved valves shall be verified against the original set temperature results once a year. TMV3 valves must also receive a regular in-service test to check they are performing adequately. If they are not, the valve must be serviced.

However, prior to any servicing taking place, a risk assessment will help to determine the risk and advise if a TMV is required in the first instance. However, due to the ambient temperatures that a TMV generates, annual, or otherwise specified, inspection, cleaning, descaling and disinfecting is required.

Our Services

Initially, the TMV will be accessed and a failsafe test will be carried out, this is done by isolating the cold supply into the valve and the hot tap turned on with a temperature probe reading monitor to check if the hot supply cuts off before the temperature increase above 50 degrees. Once the failsafe is complete the valve will be isolated, and if valves are present and in good working order, they will be stripped down to complete a clean, descale and disinfection of strainers using a suitable disinfectant and descaling method. Once complete, the valve is flushed through and re-assembled and put back into service with the hot temperature set to between 39-43 degrees.

If a valve fails, this test there will be recommendation made for the TMV to be replaced. A report will be completed detailing the work completed on each valve with recommendations included.

This cleaning is important to ensure there is no dirt that could lead to bacteria growth such as Legionella.

Nathan Bal
NSK Contractors Ltd

We use EAWHS for all of our air and water hygiene work and have done for many years.

Fred Mansfield
Event Hire Group

We utilise EAWHS for their specialist water treatment services on a number of sites. They always deliver!

Jack Lee
June Commercial Services

Evolution Air & Water Hygiene Services have worked closely with us on a number of projects in the south east, the service we are provided with is second to none.

Michelle Dormer
Abby Marketing

Our ventilation system and water outlets needed to be tested and disinfected after some neglect. A full survey was carried out with explanations of problem areas showing clarity and good understanding

Jak Cantwell
Aventus Environmental

Specialist within the hygiene industry with a meticulous eye for detail, these are the reasons why we chose EAWHS every time.

David Catchpole
Estate Agent Director

EAWHS always exceed our expectations for the maintenance of our offices. Always pleasure, never a chore to deal with.

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