How to determine the heat output for a different temperature gradient?

The heat output of each radiator varies depending on the temperature gradient. According to EN 442 (radiators), the heat output must be measured by an independent accredited laboratory for the thermal gradient of 75/65/20°C. This means the inlet water at a temperature of 75°C, the outlet water at a temperature of 65°C at an air temperature of 20°C in the heated room. If these temperatures change, a change in the heat output of the radiator will follow. For this reason, we offer in our catalogues the heat outputs of radiators always for several commonly used temperature gradients. 

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