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)
