Inner tank:SUS304-2B food grade stainless steel.
Outer tank: Galvanized steel + powder painting
Vacuum tube: Three-High vacuum tube its absorb rate is 94-96%
Type: 16-40 tubes
Bracket:galvanized steel plate with plastic spraying.
Heat preservation:55-60mm imported PU; integral foaming can keep the water temperature last for 72 hours.
Capacity:100-300 liter
Life span:15years.
Freeze protection:-25?
solar water heater