Heating
The heating tables list pipe sizes, insulation and installation. Insulation thickness follows the steps of the German building energy act, and bracket spacing follows the outside diameter. Fire-stopping sizes sit beside them as reference values, not as a separate calculation.
The heating tables are reference values, not a second pipe calculation. Insulation thickness follows the steps of the German building energy act from the bore: up to 22 mm it is 20 mm, up to 35 mm it is 30 mm, up to 100 mm about the bore, and above that 100 mm. Half insulation is half of that. Bracket spacing steps with the outside diameter and is shorter for plastic. Fire-stopping sizes sit beside them as product values.
Steel pipe with a 27.2 mm bore, which is DN 25: insulation 30 mm, half 15 mm on the energy-act steps.