Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
Grundfos UPM3 Circulating Pump
The Grundfos UPM3 circulating pump range provides high-efficiency water circulation for compatible underfloor heating and central heating systems. Choose the Grundfos UPM3 Flex Pump 25-70 130 or Grundfos UPM3 AUTO Pump 25-70 130. Both options have a 7m maximum head and 130mm port-to-port length. Flex supports external PWM profile A control or selected speed-curve operation, while AUTO provides internal pressure and speed control.
Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
Grundfos UPM3 Circulating Pump
The Grundfos UPM3 circulating pump range provides high-efficiency water circulation for compatible underfloor heating and central heating systems. Choose the Grundfos UPM3 Flex Pump 25-70 130 or Grundfos UPM3 AUTO Pump 25-70 130. Both options have a 7m maximum head and 130mm port-to-port length. Flex supports external PWM profile A control or selected speed-curve operation, while AUTO provides internal pressure and speed control.
Quick Trade Summary: Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
The Grundfos UPM3 Circulating Pump (GP-UPM3-FLEX-25/70) is the ultimate high-performance 130mm pump engineered for medium to large underfloor heating manifolds (up to 12 ports and 180m² heated area). Delivering an industry-leading 7.0 metres of hydraulic lift with Grundfos's patented AUTO-modulating curve, it replaces older UPM2, UPS 15-50, and UPS 15-60 pumps with superior hydraulic head and silent operation.
Trade Engineering Standards & Hydraulic Application
In hydronic underfloor heating installations, matching the circulation pump's head and volumetric flow rate to circuit pressure drop is essential to prevent cold spots, actuator noise, and premature component wear. The Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head) is precision-engineered to British Standard BS EN 1264 and CIBSE hydronic sizing standards, guaranteeing balanced loop flow across modern UK domestic and commercial heating systems.
Engineering Specifications & Technical Standards
| Parameter | Specification Standard |
|---|---|
| Manufacturer / Brand | Grundfos (Authentic OEM Hydronics) |
| Model Reference | UPM3 FLEX 25-70 130 Auto |
| Port-to-Port Dimension | 130mm (Compact Manifold Spacing) |
| Maximum Hydraulic Head | 7.0 Metres (0.7 bar lift) |
| Maximum Volume Flow Rate | 3.6 m³/h (60 L/min) |
| Threaded Connection | 1½" BSP Male (Standard UFH Union Nut) |
| Control Technology | Self-Modulating AUTO Mode, Proportional Pressure, Constant Curve |
| Energy Efficiency Index | EEI ≤ 0.20 Benchmark Standard |
| Electrical Supply | 230V AC, 50 Hz Single Phase |
| Power Input Range | 4W to 52W (Dynamic Auto-Throttling) |
| Operating Fluid Range | +2°C to +95°C |
| Static Pressure Rating | 10 Bar (PN10) |
| Certifications | BS EN 1264, VDE, CE, UKCA Certified |
Step-by-Step Installation & Commissioning Protocol
- Hydraulic Isolation & Depressurisation: Close manifold isolation ball valves and isolate primary boiler feeds before loosening union nuts. Have a trade catchment tray ready for residual water.
- Gasket Seating & Mechanical Fit: Inspect flat union mating faces. Insert fresh 1½" EPDM sealing washers. Position pump body strictly with the motor shaft horizontal (never pointing vertically up or down) to ensure water-lubricated bearing longevity.
- Torque Alignment: Tighten 1½" BSP union nuts by hand, then secure with adjustable pump spanners to recommended torque (approximately 45–55 Nm). Do not overtighten or pinch the rubber gasket.
- Electrical Termination: Wire live, neutral, and earth into the manifold wiring centre or 230V room thermostat switched live output. Verify earth continuity in accordance with BS 7671 (IET Wiring Regulations 18th Edition).
- Venting & Air Purging: Fill the manifold circuits loop by loop until flowmeter sight glasses run crystal clear of trapped microbubbles. Power on pump and allow automatic air-venting routine to complete before locking final operational mode.
- Flow Balancing: Calibrate flowmeters on each manifold port according to CIBSE design calculation sheets (typically 1.5 to 2.5 Litres/min per loop depending on loop length).
Frequently Asked Questions: Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
Why is the Grundfos UPM3 7m preferred for large manifolds?
Standard 5m or 6m pumps struggle to overcome hydraulic friction on 8 to 12 port manifolds where total pipe length exceeds 800m. The UPM3's 7.0m head ensures adequate flow (2.0–3.0 L/min) reaches even the longest index loop.
Can the UPM3 replace older Grundfos UPS2 or UPS 15-50 circulators?
Yes, provided the port-to-port spacing is 130mm. If replacing an older 130mm Grundfos pump, the union nuts and manifold face align perfectly without alterations.
What does the Grundfos AUTO mode do?
The AUTO mode continuously monitors system pressure changes as manifold actuators open and close, automatically shifting the pump curve to deliver the exact required flow rate while minimising electricity consumption.
Does this pump have ceramic bearings?
Yes, Grundfos UPM3 motors feature precision ceramic shafts and carbon radial bearings lubricated directly by the system fluid, ensuring silent operation and resistance to magnetite sludge.
What electrical cable is required?
It uses the standard Grundfos mini-superseal power plug. If your existing wiring has this connector, it plugs straight in; otherwise, a matching cable harness can be fitted.
Is this pump suitable for heat pump underfloor heating?
Yes, its high volume flow (3. 6 m³/h) and low minimum power draw make it ideal for low-temperature heat pump primaries running at tight 5°C ΔT differentials.
Order the Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head) with Trade Delivery
Genuine heating and hydronic supplies in stock for immediate dispatch. Backed by full UK manufacturer warranty and dedicated technical support.
Quick Trade Summary: Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
The Grundfos UPM3 Circulating Pump (GP-UPM3-FLEX-25/70) is the ultimate high-performance 130mm pump engineered for medium to large underfloor heating manifolds (up to 12 ports and 180m² heated area). Delivering an industry-leading 7.0 metres of hydraulic lift with Grundfos's patented AUTO-modulating curve, it replaces older UPM2, UPS 15-50, and UPS 15-60 pumps with superior hydraulic head and silent operation.
Trade Engineering Standards & Hydraulic Application
In hydronic underfloor heating installations, matching the circulation pump's head and volumetric flow rate to circuit pressure drop is essential to prevent cold spots, actuator noise, and premature component wear. The Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head) is precision-engineered to British Standard BS EN 1264 and CIBSE hydronic sizing standards, guaranteeing balanced loop flow across modern UK domestic and commercial heating systems.
Engineering Specifications & Technical Standards
| Parameter | Specification Standard |
|---|---|
| Manufacturer / Brand | Grundfos (Authentic OEM Hydronics) |
| Model Reference | UPM3 FLEX 25-70 130 Auto |
| Port-to-Port Dimension | 130mm (Compact Manifold Spacing) |
| Maximum Hydraulic Head | 7.0 Metres (0.7 bar lift) |
| Maximum Volume Flow Rate | 3.6 m³/h (60 L/min) |
| Threaded Connection | 1½" BSP Male (Standard UFH Union Nut) |
| Control Technology | Self-Modulating AUTO Mode, Proportional Pressure, Constant Curve |
| Energy Efficiency Index | EEI ≤ 0.20 Benchmark Standard |
| Electrical Supply | 230V AC, 50 Hz Single Phase |
| Power Input Range | 4W to 52W (Dynamic Auto-Throttling) |
| Operating Fluid Range | +2°C to +95°C |
| Static Pressure Rating | 10 Bar (PN10) |
| Certifications | BS EN 1264, VDE, CE, UKCA Certified |
Step-by-Step Installation & Commissioning Protocol
- Hydraulic Isolation & Depressurisation: Close manifold isolation ball valves and isolate primary boiler feeds before loosening union nuts. Have a trade catchment tray ready for residual water.
- Gasket Seating & Mechanical Fit: Inspect flat union mating faces. Insert fresh 1½" EPDM sealing washers. Position pump body strictly with the motor shaft horizontal (never pointing vertically up or down) to ensure water-lubricated bearing longevity.
- Torque Alignment: Tighten 1½" BSP union nuts by hand, then secure with adjustable pump spanners to recommended torque (approximately 45–55 Nm). Do not overtighten or pinch the rubber gasket.
- Electrical Termination: Wire live, neutral, and earth into the manifold wiring centre or 230V room thermostat switched live output. Verify earth continuity in accordance with BS 7671 (IET Wiring Regulations 18th Edition).
- Venting & Air Purging: Fill the manifold circuits loop by loop until flowmeter sight glasses run crystal clear of trapped microbubbles. Power on pump and allow automatic air-venting routine to complete before locking final operational mode.
- Flow Balancing: Calibrate flowmeters on each manifold port according to CIBSE design calculation sheets (typically 1.5 to 2.5 Litres/min per loop depending on loop length).
Frequently Asked Questions: Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head)
Why is the Grundfos UPM3 7m preferred for large manifolds?
Standard 5m or 6m pumps struggle to overcome hydraulic friction on 8 to 12 port manifolds where total pipe length exceeds 800m. The UPM3's 7.0m head ensures adequate flow (2.0–3.0 L/min) reaches even the longest index loop.
Can the UPM3 replace older Grundfos UPS2 or UPS 15-50 circulators?
Yes, provided the port-to-port spacing is 130mm. If replacing an older 130mm Grundfos pump, the union nuts and manifold face align perfectly without alterations.
What does the Grundfos AUTO mode do?
The AUTO mode continuously monitors system pressure changes as manifold actuators open and close, automatically shifting the pump curve to deliver the exact required flow rate while minimising electricity consumption.
Does this pump have ceramic bearings?
Yes, Grundfos UPM3 motors feature precision ceramic shafts and carbon radial bearings lubricated directly by the system fluid, ensuring silent operation and resistance to magnetite sludge.
What electrical cable is required?
It uses the standard Grundfos mini-superseal power plug. If your existing wiring has this connector, it plugs straight in; otherwise, a matching cable harness can be fitted.
Is this pump suitable for heat pump underfloor heating?
Yes, its high volume flow (3. 6 m³/h) and low minimum power draw make it ideal for low-temperature heat pump primaries running at tight 5°C ΔT differentials.
Order the Grundfos UPM3 Circulating Pump – Flex & AUTO (130mm, 7m Head) with Trade Delivery
Genuine heating and hydronic supplies in stock for immediate dispatch. Backed by full UK manufacturer warranty and dedicated technical support.
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