... heat mass quantity hot water for industrial use and supply for water for central heating system. typeCirculating water(T/H)heating load( ... 90 ° C, the system supply and return water temperature of 80/60 ° C, the system return water pressure 0.3Mpa, steam pressure ... and circulation pumps.2. Commercial, civil heating and hot water supply system: such as living quarters, office buildings, hotels, bath, ...