Ideal Standard TMV3 Valves
Reliance TMV3 Valves
Yorkshire Pegler Prestex TMV
Douglas Delabie TMV
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Anti Scalding Legislation
Burns and Scalds
Legionnaires Disease. What is it?

Thermostatic mixing valves by Douglas Delabie

tmv3 scheme blending valves by Douglas Delabie

Douglas Delabie TMV3 - Thermostatic mixing valves

Scald protection with Thermostatic mixing valves by Douglas Delabie


Please Note: For Legislation relating to Scalding and Building Regulations in England, Wales and Scotland please click here.


TMV thermostatic mixing valves ensure the delivery of blended water at a constant temperature whatever the variations of pressure, flow rate and temperature in the installation.

NHS Estates Model Engineering Specification D08 and the BuildCert TMV3 Scheme requires that TMVs installed in the high-risk sector, such as hospital and healthcare, care homes for the young and elderly, deliver precise temperature control (preventing scalding) and are safer and easier to maintain.

For lower risk applications, such as in housing association installations, manufacturers introduced a new TMV2 Scheme, also administered by BuildCert.

Both schemes guarantee that products are independently tested and certified to conform to a rigorous set of performance and endurance criteria.

The common characteristic of TMV thermostatic mixing valves is to provide the ANTI-SCALDING SAFETY:

- Immediate hot water shut-off in case of cold supply failure.

- Maximum temperature limitation at the outlet.


Douglas Delabie Thermostatic Mixing Valves (TMV)

Douglas Delabie Economix TMV3

Douglas Delabie Economix

Douglas Delabie ES Range TMV3

Douglas Delabie ES Range

Douglas Delabie VTM blending valves

Douglas Delabie VTM Range


Safe water temperature and the risks of Legionella bacteria

Temperature Control Limits

of hot and cold water distribution networks in public and commercial places has to take into account:

- minimum temperatures to avoid Legionella development

- maximum hot water temperatures to prevent risk of scalding

Scalding can occur in many situations in all types of buildings, both public and private.

Scalds are wholly avoidable and the degree of potential risk depends on the actual temperature and volume of hot water delivered and the contact time.

NHS Estates Guidance Note - 'safe' hot water and surface temperatures provide useful guideline figures.

Hot water storage: hot water temperature should be stored at or above 60C and distributed to the point-of-use control (TMV) at 55C or above.

Cold water supply: cold water temperatures must not exceed 20C.

Final distribution pipes from the thermostatic mixing valve to the points-of-use must be as short as practical and in high risk applications NOT more than 2 metres. In lower risk application the maximum length is 5 metres, with water discharged within 30 seconds.

Recommended maximum outlet temperatures at point-of-use:

- Bath Fill (see Note 1) 46C

- Washbasins 41C

- Showers 41C

- Bidet 38C

Hot water delivery temperatures should never exceed 46C.


Whilst there is a continuing objective to harmonise standards across the European community, there remain significant differences.

1. The recent regulations agree that the best way to limit Legionella bacteria development is to produce and deliver hot water

at a higher temperature.

2. The scalding risk in public and commercial places therefore grows significantly:

- at 55C: third-degree burns in 100 seconds. Healthy adult skin will suffer burns in 30 seconds.

- at 60C: third-degree burns in 5 seconds on average (shorter duration for a child - at 70C: less than ONE second).

Thermostatic mixing valves applications:

- at the boiler outlet to lower the temperature of the hot water distribution.

- upstream and as close as possible of points-of-use to avoid any risk of scalding (i.e. 38-46C).



- Prevents risks of scalding in the high-risk sector by lowering hot water temperature at points-of-use.

- Ensures a constant temperature at points-of-use (regulates fluctuations).

Economix 15/3 is licensed for healthcare use under HP/LP-B, HP/LP-S, HP/LP-W.

Economix 22/3 is licensed for use under HP-T44.


- Prevents risks of scalding in the high-risk sector by lowering hot water temperature at points-of-use.

- Ensures a constant temperature at points-of-use (regulates fluctuations).


- Prevents risks of scalding by lowering hot water temperature at points-of-use.

- Ensures a constant temperature at points-of-use (regulates fluctuations).









Douglas Delabie - TMV3 safety equipment




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