TMV 2 & 3 - Approval Procedure
The demand escalated in 1993, when the United Kingdom National Health Service required an enhanced and robust test regime for thermostatic mixing valves (TMVs) that could react to cold water failure. Since hot water is used as the primary method to control the proliferation of Legionella in the water supply system in many health care facilities, temperature control devices that perform as claimed are extremely important. A need for the evaluation of similar devices for the general residential/housing market came about a few years later.
The BuildCert program (now falling under the NSF International name) created a series of successful testing and certification schemes to evaluate anti-scald and temperature control devices, which can help manufacturers of these products comply with regulations and requirements, including:
TMV2 is a certification scheme designated for thermostatic mixing valves to be compliant with BS EN 1111 (high pressure) and/or BS EN 1287 (low pressure). NSF International carries out testing and certification to these standards for a wide variety of temperature designations and installation types.
Certification for these products is especially important as Children’s Burns Trust reported 1,667 acute injury admissions caused by scalding associated with tap splashes or spill and bathing immersion between 2005 and 2011 across England and Wales. This included 1,448 incidents occurring in the home, with 75 people dying as a result of their scalds. In 2012, 3,951 children under the age of 5 had to be admitted to hospital as a result of these burns.
The thermostatic mixing valves covered by the TMV2 scheme are used in domestic properties or other domestic type situations. Due to the high level of injury and death because of burning and scalding, the UK Building Regulations Part G requires mixing valves to be compliant with BS EN 1111 and/or BS EN 1287 to assure safety for users.
TMV3 is a certification scheme designated for thermostatic mixing valves to be compliant with the performance requirements of the UK Department of Health HTM 04-01 Supplement, Performance specification D 08. These thermostatic mixing valves are used in high-risk areas of healthcare premises. This robust performance-based specification ensures the safety of vulnerable people including children, older people and users who are unable to react to prevent injury while washing or bathing.
NSF International carries out testing and certification to this standard for a wide variety of temperature designations and installation types.
The Distribution Tempering Control (DTC) valve scheme certifies that distribution tempering valves comply with the performance requirements of Part G of the UK Building Regulations as well as the European standard BS EN 15092: Building valves. In-line hot water tempering valves. This valve is required to be installed when the operating temperature of the domestic hot water storage vessel in a dwelling is capable of exceeding 80°C under normal operating conditions.
NSF International carries out testing and certification to this standard.
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NSF International manages the TMV2 and TMV3 certification schemes that verify thermostatic mixing valves (TMVs) for domestic and healthcare use. These certifications satisfy the robust performance requirements detailed in the standards BS EN 1111 and BS EN 1287 (domestic) and in the UK Department of Health and Social Care performance specification D 08 (healthcare). NSF International delivers TMV2 testing and certification against the 2017 version of these performance standards.
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