Building products such as thermostatic mixing valves comply with Part G3 building regulations introduced by the Government.
Part G building regulations address the minimum requirements for building products to increase accident prevention against scalding.
The majority of scalding incidents occur in the home from excessively hot bath water. Young children and the elderly are those most at risk as their skin is thinner and less tolerant to higher water temperatures.
Building products such as thermostatic mixing valves comply with Part G3 building regulations introduced by the Government. From April 2010, revisions to Part G3 building regulations require all baths in new dwellings to be fitted with a thermostatic mixing valve to limit the temperature of hot water.
Thermostatic mixing valves or TMVs are valves that control water temperature by mixing hot and cold water to maintain a constant, safe temperature. It is recommended that water stored in the home be kept at over 60°C to kill any bacteria, such as Legionella, and higher water temperatures are also needed for cleaning and washing. A thermostatic mixing valve combines the water stored at such temperatures with cold water, to ensure water at a temperature set by the installer, to prevent scalding.
To maintain a constant temperature, thermostatic mixing valves are unaffected by changes in water pressure, for example: the use of water through another appliance in the house. In the event of a cold water failure, a thermostatic mixing valve will shut down, preventing the user from being scalded.
Thermostatic mixing valves are also used in conjunction with water saving tap flow limiters, designed to minimise water wastage.
Useful resources
- From Trade Associations and Supporting Organisations
- Thermostatic Mixing Valves (TMVs) for Safe Provision of Hot Water posted by BEAMA
- Use Thermostatic Mixing Valves (TMVs) to Prevent Hot Water Scalding posted by BRE
- Guide to Part G of the Building Regulations posted by Construction Books Direct
- Benefits of Thermostatic Mixing Valves (TMVs)posted by Bathroom Manufacturers Association
Information Updated on: 10 May 2011
