... valve 8. Expansion vessel connector9. Return circuit connector 10. Wall mounting 11. Expansion vessel: 5L, 8L, 12L, 19L, 20L, ... heat loss coefficientULT=0.6~0.7W/(m2.C)Bracket:2.0mm thickness aluminum alloyWelding:Argon arc weldingFastening ... pieces:Made of stainless steel screwTank capacity200LSolar collector1pcs 58x1800x20tube solar collectorAbsorber area1.875 m²Working stationSP106, SP116,SR962 ...