Recommended for reservoirs up to 317 gallons, 120-volt Sunleaves AquaChill 317 units have push-button temperature regulation, cleanable air filters, specialized sockets for external heater connection and a one-year warranty against defects. The AquaChill 317 has stainless steel casing and .75-inch outlets. Gardeners simply connect a high-performance pump and their nutrient solution temperature is reduced as it circulates through the unit’s internal titanium thermal converter.