Grundfos UPSO 15-50 75W Gas Boiler Circulation Pump
(Compatible with Nobel 2-24 SE Plus – Part No. 1488)
The Grundfos UPSO 15-50 75W is a high-efficiency circulation pump used in gas boilers for circulating hot water throughout the central heating system. It ensures consistent water flow to radiators and underfloor heating, maintaining an efficient heating performance.
🔹 Key Features:
- Model: Grundfos UPSO 15-50
- Power: 75W energy-efficient motor
- Flow Rate: Up to 50 litres per minute
- Pipe Connection: 1.5″ BSP threaded ports
- Voltage: 230V AC
- Pump Speed: Three-speed settings for adjustable performance
- Compact & Durable: Designed for long-lasting operation in gas boilers
- Silent Operation: Minimizes noise while running
- Compatible With: Nobel 2-24 SE Plus boiler (Part No. 1488)
🔹 Common Issues Indicating a Pump Replacement:
✔ Radiators not heating properly due to poor water circulation
✔ Noisy pump operation (grinding or humming sounds)
✔ Boiler overheating or shutting down (due to lack of water movement)
✔ Leaking water from the pump housing
✔ Error codes on the boiler related to circulation issues
🔹 Installation & Setup:
- Turn off the boiler and isolate the power supply
- Drain the heating system if necessary
- Disconnect the faulty circulation pump from the pipework and wiring
- Install the new Grundfos UPSO 15-50 pump, ensuring correct alignment
- Reconnect the wiring and check for leaks
- Refill the system and bleed radiators to remove airlocks
- Test the boiler operation and adjust the pump speed if needed
⚠ Important: This should be installed by a Gas Safe registered engineer to ensure proper operation and compliance with regulations.
🔹 Alternative Compatible Pumps:
- Grundfos UPS3 15-50/65 – High-efficiency upgrade
- Wilo Yonos Para 15/6 – Suitable for modern condensing boilers
- DAB Evosta 2 15-50/60 – Energy-saving circulator pump
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