UPS43-100SF 3 Speed Stainless Steel Circulator Pump 115V 9H IMU

The Grundfos UPS 43-100 SF circulator pump is a high-performance, corrosion-resistant solution engineered for domestic hot water systems, potable water applications, and underfloor (radiant) heating systems. Available with either a bronze pump housing (UPS B) for drinking water applications or a stainless steel housing (UPS N), this pump is specifically designed to handle aerated liquids that can cause corrosion in traditional cast iron pumps. Both bronze and stainless steel variants offer exceptional resistance to corrosion, making them ideal for hot water recirculation and hydronic heating systems where system longevity and water quality are critical. The pump is particularly well-suited for underfloor heating systems, where air entrainment can accelerate wear in lower-grade materials. The UPS 43-100 SF features a maintenance-free canned rotor construction, integrating the pump and motor into a single, compact unit. This seal-less design eliminates the need for a mechanical shaft seal and uses only two gaskets, significantly reducing the risk of leaks and minimizing maintenance requirements. The bearings are lubricated by the pumped liquid, ensuring smooth, efficient, and quiet operation throughout the pump's lifecycle.

• Corrosion resistant pump housing
• Built-in thermal overload switch
• Maintenance-free canned rotor design with no shaft seals
• Quiet, low noise operation for improved comfort
• Corrosion resistant impeller
• Multi-speed