Water pump upgrade-Package two(1 5 hp applicable area≤80㎡ three-year warranty) Water pump upgrade-Package four(1 5 hp applicable area≤150㎡ three-year warranty) Water pump upgrade-Package four (1 5 hp applicable area ≤ 150 ㎡ three-year warranty) Water pump upgrade-package four (1 5 hp applicable area ≤ 150 ㎡ three-year warranty)