Mixing unit (definition)

Mixing unit — is a heating system component designed to regulate the temperature of the coolant supplied to the underfloor heating circuit or other low-temperature heating systems. The mixing unit mixes the hot coolant from the boiler with the cooled coolant, returning from the heating circuit to achieve the required supply temperature.

The main components of the mixing unit:

1. Three-way or four-way valve: Controls the flow of hot and cooled coolant, regulating their mixing to achieve the desired temperature.
2. Circulation pump: Ensures circulation of the coolant in the underfloor heating circuit, maintaining uniform heat distribution.
3. Thermostatic or electronic regulator: Controls the operation of the valve and pump, maintaining the set supply temperature in the heating circuit.
4. Thermometers and sensors: Allows monitoring of the temperature at the inlet and outlet of the unit, providing precise control of the system.

Functions of the mixing unit:

• Temperature regulation: The main function of the mixing unit is to maintain the optimum temperature of the coolant, which is especially important for underfloor heating systems, where the supply temperature should be lower than in radiator systems.
• Improving energy efficiency: Thanks to precise temperature control, the mixing unit prevents overheating and reduces energy consumption.
• System protection: Prevents the supply of too hot coolant to low-temperature circuits, which can lead to damage to pipes or coatings.

Application in heating systems:

Mixing units are used not only in underfloor heating circuits, but also in any systems where heat carrier temperature regulation is required. They ensure stable heating operation, improving comfort and energy efficiency of the entire system.