/, Contextual, DHW, DHW (measure), Operators, Owners, Physical environmental, Physiological, Psychological, Short term/1.3.7 Installation of mixing valves in the outlet of the DHW tank

1.3.7 Installation of mixing valves in the outlet of the DHW tank

1.3.7 Installation of mixing valves in the outlet of the DHW tank


A thermostatic mixing valve mixes cold and hot water, generally with a temperature differential of at least 7°C, in order to obtain mixed water at a stabilized temperature, avoiding in this way losses of hot water while adjusting the temperature with the tap.


  • Increase the hot water storage capacity

  • Perfect for thermal or photovoltaic solar hot water heating because of increase in storage capacity

  • A mixing valve can make tap temperatures safe even when running a water heater at maximum temperatures

  • Mixing valves may be better regulation of the temperature of the hot water at the tap compared to thermostats that turn water heating on and off


  • Running water heater at increased water temperatures may cause increased amount of calcification to precipitate out of the water requiring more frequent cleaning and shorter element life

  • Increase water temperature in tank will mean more stand-by loss

  • Increase installation space

Economic assessment

The retail cost of the valves at some of the larger retail chains is just under 100 €. A plumber may charge 100-200 € to install it.

References and best practices

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Environment or playable world:

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  • All

Carried out by:

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Reduce consumption of:

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Type of driver:

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Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
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