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Glossary. Heating technology
explained simply.

All about heating. From A to Z.

When it comes to heating, there are a few technical terms that need to be explained. You can find everything you need to know here. In alphabetical order.

Flow temperature

The temperature of the Heating circuit  water flowing to a radiator. As a rule, the Flow temperature  in radiator heating systems is up to 70 °C (up to 40 °C in underfloor heating systems). The temperatures are only that high, however, when outside temperatures are low. If the outside temperature increases, then the flow temperatures decreases.


Fuel oil, natural gas, LPG, and biogas are all used as Fuels  and are essentially hydrocarbon chains. Their energy content is released when they are mixed with air and combusted.