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Technical glossary
- Radiant losses
Energy lost when parts of a heating system radiate heat from uninsulated points or through the insulation. Pipework and uninsulated sections of the domestic hot water and heating systems are particularly affected.
- Return temperature
The temperature of the heating circuit water flowing back from radiators or floor heaters. As a rule, low temperatures are found in the return. With floor heating systems, the temperature is no higher than 30 °C; with radiator heating systems, it is often not higher than 50 °C.