Grundfos UPM3 25-70 130 AZA FLEX-AS Circulation Pump is an internally controlled, high-efficiency circulator designed for heating applications, including underfloor heating. Its compact format is intended for installations where space is limited, such as appliance housings or pump cabinets. The UPM3 FLEX-AS is designed for systems that do not use an external PWM controller.
The pump offers selectable operating settings, including constant-curve operation, and has an Energy Efficiency Index (EEI) of ≤ 0.20. Where a compatible external control signal is used, check the pump and system documentation to confirm the control requirements and setup.
130mm Port-to-Port Length
EEI ≤ 0.20
Internal Control
Suitable for Compatible UFH Systems
At a Glance
Product Type
Circulation Pump
For compatible heating systems
Port-to-Port Length
130mm
Check dimensions before replacement
Energy Efficiency Index
≤ 0.20
Listed to EN 16297/3
Connection
1½-inch BSP
Confirm fittings suit the pipework
About the Grundfos UPM3 FLEX-AS
The UPM3 FLEX-AS is an internally controlled, high-efficiency circulator intended for standalone applications and appliance or cabinet installations. Its compact design and flexible settings can suit compatible heating systems, including underfloor heating systems where the pump specification and system design are appropriate.
Applications & Suitability
This pump is commonly offered for underfloor-heating applications and may be used with compatible manifold assemblies. Confirm that the pump’s performance, connections, installation length and control method match the system. The 1½-inch BSP connection measurement is not the same as the outside diameter measured with a ruler, so check the fitting specification before ordering.
Important Installation Guidance:
Have the pump installed and commissioned by a suitably competent heating professional. Follow the current manufacturer instructions and verify the system’s hydraulic requirements, connection type and control arrangement before fitting.
Key Features
High-Efficiency Design
Listed with an EEI of ≤ 0.20 and compliance with EN 16297/3.
Internal Control
Designed for applications requiring an internally controlled pump, including setups without a PWM controller.
Selectable Operating Settings
Offers selectable pump settings, including constant-curve operation. Choose settings according to the system design and manufacturer guidance.
Compact Format
Its small design is intended for appliances and cabinets where installation space may be limited.
Underfloor-Heating Applications
Suitable for compatible floor-heating applications where the pump’s operating characteristics match the system.
Standalone Use
Designed for standalone applications as well as use in compatible kit systems.
Key Specifications
| Brand |
Grundfos |
| Model |
UPM3 25-70 130 AZA FLEX-AS |
| Connection |
1½-inch BSP thread |
| Port-to-Port Length |
130mm |
| Energy Efficiency Index (EEI) |
≤ 0.20 |
| Standards |
EN 16297/3 |
| Control |
Internal control; confirm system control requirements before installation |
| Ambient Temperature |
Up to 70°C |
| Power Consumption |
Up to 52W, as supplied |
| Liquid Temperature Range |
+2°C to +110°C, as supplied |
| Maximum Head |
7m, as supplied |
| Maximum Flow Rate |
3.5m³/h, as supplied |
| Protection Class |
IP44, as supplied |
| Warranty |
2-year manufacturer guarantee, as supplied; check terms |
Who Is This Pump For?
The Grundfos UPM3 FLEX-AS is intended for heating installers and system owners looking for a compact circulator for a compatible heating installation, particularly underfloor heating. It may be considered for a manifold system when the pump’s duty and control setup suit the number of circuits and the system design.
Installation & Compatibility
1
Check the connections: Confirm the 1½-inch BSP thread and 130mm port-to-port length match the existing installation and fittings.
2
Confirm pump and system requirements: Check that the pump’s capacity and control method are appropriate for the manifold, heating circuits and system design.
3
Set up the controls correctly: Follow the manufacturer instructions for constant-curve settings or any external control signal used by the system.
Frequently Asked Questions
What is the Grundfos UPM3 FLEX-AS designed for?
It is an internally controlled circulator for compatible heating applications, including underfloor-heating systems.
What is the pump’s installation length?
The port-to-port length is 130mm.
What connection does it use?
The listed connection is 1½-inch BSP thread. Confirm the fittings required for your installation before ordering.
Can it run without PWM control?
The FLEX-AS is described as internally controlled for applications without a PWM controller. Confirm the intended control setup using the product documentation.
What is its Energy Efficiency Index?
The listed EEI is ≤ 0.20.
Compact Circulation for Underfloor Heating
The Grundfos UPM3 25-70 130 AZA FLEX-AS is a compact, internally controlled circulator with an EEI of ≤ 0.20 and a 130mm installation length. Check pump sizing, connections and control compatibility before purchase. GetPlumb offers the pump with delivery or collection options; confirm current price, stock and availability directly with the supplier.
