Brassware for public buildings
Washbasin and bath taps installed in public buildings must be capable, as a minimum, of being operated using a clenched fist. A lever action, push button or electronic brassware should be installed.

All brassware and valves must be thermostatically controlled to a maximum temperature of 43°C to meet Approved Document G of the Building Regulations in England and Wales. In Scotland the Scottish Building Regulations prevail.

Brassware should be marked clearly to distinguish between hot and cold settings for the benefit of visually impaired people. 

Thermostatic Mixing Valves- TMVs
Healthy adult skin requires only 30 seconds of exposure to water at 55 degrees Celsius before third-degree burning occurs. At 70 degrees Celsius serious burning occurs in less than a second. The skin of children and older people is even more sensitive to extreme temperatures. 
A maximum hot water temperature of 40 degrees is therefore recommended for showers, 43 degrees for a bath and 48 degrees for the kitchen sink.

Products called Thermostatic Mixing Valves are available to accurately control the temperature of water for showering, bathing and hand-washing. These valves also maintain the pre-set temperatures even if the water pressure varies when other appliances in the building are used. Installed and maintained correctly, they can significantly reduce the risk of scalding in the home. Some types of thermostatic mixing valves can be installed with existing conventional taps, others can replace existing taps.

What is a TMV?
TMVs – Thermostatic Mixing Valves - maintain pre-set temperatures, even if water pressure varies when other appliances are used. TMVs can be fitted under baths and basins, be part of shower fittings, or as a feature of exposed hot and cold water mixers.