Elemental Solutions H2O Chiller, 1/10 HPThe 1 10 HP Elemental H2O Chiller is a helpful tool in hydroponic growing to help stabilize and cool water. By using environmentally friendly R134a refrigerant, the 1 10 HP Elemental H2O Chiller is energy efficient, and comes complete with a temperature memory feature. Uses R134a refrigerant Requires 1 2 or 3 4 tubing 66. 5 410 GPH flow rate 120v, 170w 13 40 gallon unit capacity 130 280 GPH pump recommended