The UP/UPS Series covers Grundfos induction wet‑rotor circulators for hydronic heating, cooling, and domestic hot‑water recirculation (bronze/stainless only). These pumps use simple, durable induction motors and are widely used in traditional systems where reliability and familiarity matter more than electronic control.
Series Purpose
Fixed‑speed (UP) and multi‑speed (UPS) circulators for closed hydronic systems and select potable‑water applications when bronze or stainless housings are used.
Shared Construction
- Induction motor
- Canned‑rotor design
- Water‑lubricated bearings
- Horizontal motor shaft
- Cast‑iron, bronze, or stainless housings
- EPDM seals
- Glycol compatibility up to 50%
Hydraulic Range
- Head: ~11–62 ft
- Flow: ~9–275 GPM
- Connections: Threaded or flanged depending on model size
- Temperature: Up to 230°F depending on model and ambient conditions
UP — Single‑Speed Circulators
Purpose: Simple, fixed‑speed circulators for stable hydronic systems.
Applications:
- Baseboard loops
- Radiator circuits
- Boiler pumps
- Cooling loops
- DHW recirculation (bronze/stainless only)
Advantages:
- Extremely reliable
- No setup required
- Ideal for like‑for‑like replacements
Limitations:
- No modulation
- Not suitable for TRV systems
- Not energy‑optimized
UPS — Multi‑Speed Circulators
Purpose: Multi‑speed induction circulators offering manual performance selection.
Speed Options: 2‑ or 3‑speed depending on model.
Applications:
- Zone pumps
- Multi‑loop hydronic systems
- Snow melt
- Light commercial heating
- DHW recirculation (bronze/stainless)
Advantages:
- Installer‑selectable performance
- Works in systems with varying flow needs
- Proven long‑term reliability
Limitations:
- No ECM efficiency
- No AUTOADAPT or pressure control
- Not ideal for modern TRV systems
Best‑Fit Summary
- Use UP for simple, stable loops.
- Use UPS when you need manual performance adjustment.
- Use bronze/stainless for potable water.
- Avoid both in systems requiring pressure modulation or high efficiency.
