High and smooth flow with minimum noise and vibration, provided by 4-chamber pump head.Premium model includes an adjustable by-pass.Starting and stopping controlled by pressure switch:pump starts as soon as water is being used.Premium model features an adjustable by-pass.Self-priming up to 1.82 m.Can run with hot water (up to 54°c).Sealed switch & motor.Can run dry without damage.Thermal overload protection (with automatic restart).Intermittent duty.1/2´´- 14 npsm male connectors included.3-year warranty.Ignition protectediso 8846ideal for 3 water fixturesopen flow:11.35 l/min.Max by-pass pressure 4.5 bar/65 psicons.:5 amp.Hose:ø ½´´.