Гармкунаки трубопровод таҷҳизоти каммасрафест, ки муҳити гармкуниро пешакӣ гарм мекунад. It is installed before the heating medium equipment to directly heat the medium, so that it can circulate heating at high temperatures, and finally achieve the purpose of saving energy. It is widely used in the pre-heating of fuel oil such as heavy oil, asphalt, and clear oil.