For a quick selection of the required pipe diameter according to the power of the circuit, the shown picture is suitable. It is valid for the following conditions.

Pipes are available in standard diameters, from which you need to make a choice. The developed standard solutions for the selection of pipe diameters for heating a house, guided by which, in 99% of cases, you can make the optimal correct choice of diameter without performing a hydraulic calculation. Developed standard solutions for the selection of pipe diameters for heating a house. The standard outer diameters of polypropylene pipes are 16, 20, 25, 32, 40 mm. corresponding to this value, the inner diameter of pipes of grade РN25 – 10.6, 13.2, 16.6, 21.2, 26.6 mm, respectively.