Grundfos UPS 25-80 N circulator pump (180 mm)
- Application: heating + DHW
- Q × H: up to 3.5 m³/h × 8.0 m
- Power / P1 max: 1×230 V / 90 W
- DN + PN: DN25 (G1½ (Rp1)), PN 10
Where UPS 25-80 N is used
Classic 3-speed UPS 25-80 N with stainless-steel rotor can — for domestic hot water (DHW) recirculation and small potable-water systems. The 'N' (stainless) variant is potable-water rated.
The pump handles water and water–glycol mixtures up to 50 % (viscosity impact to be accounted for). Control modes: 3 fixed speed steps (I/II/III), manual selection. Liquid temperature range: +2 °C … +110 °C.
Technical specifications
| Parameter | Value |
|---|---|
| Model | UPS 25-80 N |
| Manufacturer code | 95906439 |
| Connection | G1½ (Rp1) (DN25) |
| Max. working pressure (PN) | 10 bar |
| Max. flow (Q) | 3.5 m³/h |
| Max. head (H) | 8.0 m |
| P1 power | 45–90 W |
| Power supply | 1×230 V / 50 Hz |
| Enclosure class | IP44 |
| Energy Efficiency Index (EEI) | not applicable (3-speed asynchronous, N = stainless) |
| Control modes | 3 fixed speed steps (I/II/III), manual selection |
| Liquid T range | +2 °C … +110 °C |
| Port-to-port length | 180 mm |
| Weight | ~3.3 kg |
Sizing formula — quick calculation
Required flow rate: Q = P / (1.163 × ΔT), where P – heating load (kW), ΔT – supply/return temperature difference (°C).
Example: a 20 kW system with ΔT 15 °C requires Q = 20 / (1.163 × 15) = 1.15 m³/h. Grundfos UPS 25-80 N fully covers up to ~25 kW systems.
When to choose UPS 25-80 N
- Combined heating + DHW applications with shared 3-speed control
- Hotels, gyms, commercial premises with long DHW loops
- Systems where potable-water-rated housing (bronze / stainless) is required
- Where simple 3-speed control without ECM is preferred
- Compatibility / replaces: UPS 25-80 (standard), Wilo Star-Z 25/6, TOP-Z 25/6.
B2B delivery and logistics via Amegata.lt
- Next-day delivery across Lithuania (from Vilnius warehouse)
- Competitive B2B pricing — often below market average
- 30-day payment terms for verified companies
- Free engineering consultation on pump selection
Official Grundfos catalogue: product-selection.grundfos.com
Frequently asked questions
What is the difference between Δp-c and Δp-v control modes?
Δp-c (constant pressure) keeps a fixed differential pressure across the system, better suited to underfloor heating or systems without thermostatic valves. Δp-v (proportional pressure) lowers the differential as flow drops, better for radiator systems with thermovalves. This 3-speed asynchronous model has no Δp-c/Δp-v — only fixed steps I/II/III.
Is it suitable for open-vented heating systems?
No — UPS 25-80 N is designed for closed pressurised systems. Open-vented gravity-flow systems require a different pump type.
Does it work with glycol?
Yes, up to 50 % water–glycol concentration. Viscosity impact must be accounted for — real head typically drops about 10–15 % with 30 % glycol, and P1 power shifts accordingly.
What is the typical EEI class and why does it matter?
DHW recirculation pumps are exempt from EU Ecodesign EEI rules — 3-speed motors consume more than ECM units, but bronze / stainless housing properties matter more than EEI here.
What is the recommended installation position?
Horizontal rotor shaft, cable entry facing down or sideways. Vertical mounting is not allowed. Install a strainer/filter upstream — pumps do not tolerate welding slag or debris in new systems.
