The Grundfos UPM3 Flex-AS circulation pump offers a high-efficiency solution for modern heating and hot water systems. Advanced ECM technology drives reliable performance while significantly reducing energy consumption and savings. This makes the pump an ideal choice for installers and homeowners along with DIYers who want to upgrade or replace existing circulation pumps in today’s energy-conscious environments.
Thanks to its compact design, the Grundfos UPM3 Flex-AS fits easily into tight installation spaces. It is commonly used in domestic heating systems, boiler units and underfloor heating manifold applications where dependable circulation is essential. As well as its flexible control options allow it to adapt seamlessly to different system requirements.
High-Efficiency Circulation Pump for Modern Heating Systems
Energy efficiency sits at the heart of the Grundfos UPM3 Flex-AS circulation pump. The electronically commutated motor automatically adjusts performance to match system demand, reducing unnecessary power use while maintaining consistent flow and pressure throughout the system.
The pump also operates quietly, making it ideal for residential properties or care homes where low noise levels matter. By running efficiently, it helps lower energy bills and supports compliance with current energy regulations and eco-design standards.
Key Features of the Grundfos UPM3 Flex-AS
The Grundfos UPM3 Flex-AS balances performance with practicality. Multiple control modes allow it to work with a wide range of heating appliances and control systems, giving installers excellent flexibility for both new installations and replacement projects.
It’s 1.5″ BSP connections is compatible with common heating manifolds and replacement scenarios.
Next Working Day Delivery: Yes, we hold all our products in stock at our 7000 sq ft Nottingham warehouse and at our 3000 sq ft warehouse in Market Harborough and use DPD for a tracked next-day delivery.
Collection Available: You can always collect from our Nottingham location and help yourself to a free tea and coffee.









