The TMV2 Scheme is very similar to the TMV3 version but with one big difference: where the TMV3 scheme is intended to be used to certify valves for use in the high risk healthcare sector, TMV2 valves are specifically designed, built and tested for the domestic market.

From April 2010, England and Wales joined Scotland in requiring, as part of the building regulations, the control of hot water temperature to a safe maximum at the bath outlet in domestic bathrooms, which can be achieved by the fitting of a thermostatic mixing valve.

In Scotland, regulations came into force in 2006, requiring control of outlet hot water temperature for baths and bidets: this applies to all new build domestic properties where the building warrant was applied for after 1st May 2006 and is also a requirement in properties undergoing bathroom renovation works which involve the movement or replacement of the bath or bidet. In England and Wales, the revisions to Part G of the Building Regulations (Hot water supply and systems) effective from 1st

April 2010 include the requirement that baths in new homes are fitted with a protective device (ie a thermostatic mixing valve) to limit the temperature of hot water.