What is Delta T rating and what Delta T rating do you use for your outputs?

Delta T or Dt refers to the difference in temperature between the water circulating throughout your central heating system and the room temperature.

When replacing any radiators in your home it’s important that you use the correct Delta T. This is because the same radiators can have different outputs at different water temperatures due to the heat source you are using.

As of 01.03.2019, all heat loss values shown on our website will be calculated to Delta T50 (ΔT50°C), the current European CE standard.

To calculate our radiators to other Delta T outputs, please use the following table:

Correction factor to convert our heat loss values to Delta T60 – multiply by 1.267

Correction factor to convert our heat loss values to Delta T55 – multiply by 1.132

Correction factor to convert our heat loss values to Delta T50 – multiply by 1.00

Correction factor to convert our heat loss values to Delta T45 – multiply by 0.872

Correction factor to convert our heat loss values to Delta T40 – multiply by 0.748

Correction factor to convert our heat loss values to Delta T35 – multiply by 0.629

Correction factor to convert our heat loss values to Delta T30 – multiply by 0.515

Correction factor to convert our heat loss values to Delta T25 – multiply by 0.406

Correction factor to convert our heat loss values to Delta T20 – multiply by 0.304