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Filling units with a pump are a system of a thermostatic valve, pump, and thermometers. They are used to ensure and maintain a high return water temperature to the boiler. This parameter contributes to protection against low-temperature corrosion.
The advantage of the filling unit over a standalone thermostatic valve is that you gain an overview of the temperatures in individual branches. Since it includes a circulation pump, there is no need to purchase an additional pump separately. It is therefore a cost-effective package.