Elemental Solutions H2O Chiller, 1/4 HPThe 1 4 HP Elemental H2O Chiller is a helpful tool in hydroponic growing to help stabalize and cool water. By using environmentally friendly R134a refrigerant, the 1 4 HP Elemental H2O Chiller is energy efficient, and comes complete with a temperature memory feature. Uses R134a refrigerant Requires 3 4 to 1 inch tubing 264 660 GPH flow rate 120v, 310w 26 80 gallon unit capacity 250 600 GPH pump recommended