... toppest manufacturer of 58*1800 solar bolier,solar water heater with CE,Solar Keymark,CCC 1.Products series ... /KWAverage heat loss coefficientULT=0.6~0.7W/(m2.C)Bracket:1.5mm thickness Galvanized Steel or ... 4 holes for exhaust port, overflow, water inlet and outlet, electric heater is optionWelding:Argon arc weldingFastening pieces: ... of 58*1800 solar bolier,solar water heater with CE,Solar Keymark,CCC