1.seperate pressurized solar water heater 2.long life( it can be used 15 years) 3Qty. of heat pipe tube: 14-36 vacuum direct-plug water heater MODELJSSP-10JSSP-15JSSP-20JSSP-26JSSP-30JSSP-40JSSP-50VACUUM TUBEφ58X1800MMφ58X1800MM φ58X1800MM φ58X1800MM φ58X1800MM φ58X1800MM φ58X1800MM Water TankVolume100L150L200L260L300L400L500LInsulating Layer 50mm50mm 50mm 50mm 50mm60mm60mmOuter TankColor Steel ...