Grundfos 96439644 1/2HP 115/230V Single Phase Wet Rotor Circulator Pump UP 43-70 F

Description

Grundfos UP 43-70 F Wet Rotor Circulator Pump (96439644)

The Grundfos 96439644 UP 43-70 F is a high-performance, single-speed wet rotor circulator pump engineered for demanding hydronic heating and cooling applications. Built with a durable cast iron housing and a corrosion-resistant stainless steel impeller, this pump delivers reliable, long-lasting performance in closed-loop systems. Its wet rotor design eliminates the need for external bearings and seals, reducing maintenance requirements and extending service life.

Key Features

• Motor Output: 1/2 HP for powerful, consistent circulation
• Voltage: 115/230V AC, single phase — flexible for a wide range of electrical configurations
• Speed: Single speed at 3,450 RPM for steady, dependable flow
• Housing: Cast iron construction for durability and long service life
• Impeller: Stainless steel for superior corrosion resistance
• Design: Wet rotor — no external bearings or shaft seals required
• Connections: 1-1/2″ non-ANSI 2-bolt flange suction and discharge ports
• Model: UP 43-70 F

Wet Rotor Advantage

The wet rotor design means the motor rotor is immersed in the pumped fluid, which acts as both a coolant and lubricant. This eliminates mechanical seals and external bearings, significantly reducing wear points and maintenance intervals — making the UP 43-70 F an ideal choice for hydronic systems where reliability and low ownership cost are priorities.

Construction & Connections

The cast iron pump body provides robust structural integrity suitable for commercial and residential hydronic systems. The stainless steel impeller resists corrosion in treated water systems. The 1-1/2″ non-ANSI 2-bolt flange connections on both the suction and discharge sides allow for straightforward installation and serviceability in standard piping configurations.

Typical Applications

• Hydronic heating systems
• Hot water recirculation
• Radiant floor heating
• Boiler loop circulation
• Chilled water systems
• Commercial and residential HVAC hydronic loops

Specifications Summary

• SKU: 96439644
• Model: UP 43-70 F
• Brand: Grundfos
• Motor HP: 1/2 HP
• Voltage: 115/230V AC
• Phase: Single Phase
• Speed: 1 Speed, 3,450 RPM
• Housing Material: Cast Iron
• Impeller Material: Stainless Steel
• Pump Type: Wet Rotor Circulator
• Connection Size: 1-1/2″ non-ANSI 2-Bolt Flange (Suction & Discharge)