Armstrong"s Astro 2 Circulator is intended for circulating water or ethylene glycol solutions in closed hydronic or solar heating systems.Flow range: 0 - 64USgpm / 0 - 4.04 l/sHead range: 0 - 42 feet / 0 - 12.80 metersMotor: 60hz single phaseVolts: 115v / 230vMax. fluid temperature: 185°f / 85°c (astro 286 up to 1.35a)150°f / 65°c (astro 286 over 1.35a)230°f / 110°c (all others)Max. working pressure: 150 psi / 1034 kPa