Thermostatic Mixing Valves (TMVs) blend hot water (stored at temperatures high enough to kill bacteria) with cold water to ensure constant, safe outlet temperatures preventing scalding.

TMVs provide the solution to scalding and the problem of Legionella in buildings.

TMVs regulate water temperatures to the outlet, adjusting dynamically to changing supply pressures and temperatures, to ensure constant safe mixed water.

TMVs also contribute to water conservation by reducing water consumption for showering. By eliminating the need to adjust hot and cold water tap flow to arrive at a safe and comfortable mixed water temperature.

The wax thermostat technology is the engine for temperature management. It automatically manages the mixing of hot and cold water, to the user selected outlet temperature. It proportions the amount of hot and cold water entering, dynamically compensating for any variations in supply pressure and temperatures, maintaining a stable mixed water temperature. They also shut-off rapidly in the event of a hot or cold supply failure to prevent scalding or thermal shock.

It is increasingly common practice around the world to regulate the storage water temperature to above 60°C, and to circulate or distribute water at a temperature less than 50°C. Water above these temperatures can cause life threatening scald injuries. Many countries, states, or municipalities now require that the temperature of all bath water in new build and extensively refurbished domestic properties be controlled to a maximum of 48°C. Installing Thermostatic Mixing Valves (TMVs) can ensure water is delivered at the required temperature thereby reducing the risk of scalding accidents.

There are three main categories for water temperature controlling devices: Heat Source, Group Control, and Point of Use.

Heat Source: Tempering Valves • Superior quality tempering valves for use on hot water distribution systems • High flow rates suitable for use in under floor (radiant) heating applications • Allows water to be stored at a higher temperature, taking advantage of modern cylinder technology

Group Control: Group Control Thermostatic Mixing Valves • Designed for multi-point applications • High flow rates (from 14gpm to 51gpm at 45psi) • Temperature stability despite supply conditions

Point of Use: Single Outlet Thermostatic Mixing Valves • Designed for single point applications such as Individual Showering, Hand Wash Basin Mixers, Bath or Tub fillers • High level protection against scalding and thermal shock

Thermostatic mixing valves are becoming widely used in Solar Heating systems as well as Radiant Heating systems. They provide a safe, energy efficient and stable temperature in the heating system.

Thermostatic Mixing Valve Manufacturers Association Raymot