Pumps & Mixers

Low Temperature Blending Valve (20–55°C) & Grundfos Pump

Low temperature blending valve with Grundfos pump is a premium, energy-efficient pre-assembled solution for underfloor heating systems.

This unit integrates a precise thermostatic mixing valve with a high-efficiency A-rated Grundfos circulation pump (commonly the UPM3 series, such as UPM3 AUTO or HYBRID models optimised for UFH). As a result, it delivers safe mixed flow temperatures from 20°C to 55°C. Moreover, it ensures excellent scald protection, safeguards UFH pipes, screeds, and floor coverings from overheating, promotes uniform heat distribution, and complies fully with BS EN 1264 warm-up procedures. Therefore, it’s perfect for multi-zone domestic installations, combining low power consumption with quiet, reliable performance.

Key Features

• Scald-safe temperature control to safeguard UFH pipes and coverings
• Precise ±3°C stability across the 20–55°C range
• Low 20°C setting meets BS EN 1264 warm-up requirements
• High-flow 3.4 kvs for better circulation and lower pressure drops
• Compact design with minimal space and clearance needs
• Integrated temperature gauge on mixed flow (standard)
• Quick manifold connection via spinning nuts
• Built-in check valve for fast UFH manifold filling
• Self-sealing connections to reduce leak risks
• Grundfos A-rated circulation pump – high-efficiency EC motor (EEI ≤ 0.20–0.23), low power draw (typically 3–50W), multiple control modes (AUTOADAPT constant/proportional pressure, constant speed, PWM external control), max head around 6–7m (e.g., UPM3 25-70/130 variants), max flow up to ~3 m³/h, 25mm threaded connections, quiet operation, IP44 rated, integrated thermal protection, ceramic bearings for durability, and energy savings up to 80% compared to traditional pumps – ideal for UFH and variable-flow heating systems

Installation Flexibility Furthermore, the unit is fully reversible for left- or right-handed setup (top or side entry). In addition, you can optionally replace the gauge with a high-limit flow temperature sensor.

Finally, the Grundfos pump features smart controls (e.g., AUTOADAPT or push-button mode selection) for effortless adjustment to match your system’s specific demands.

UK Quality & Support Moreover, every unit is fully assembled and pressure-tested in the UK, with dedicated local technical support. Consequently, the robust construction and efficient Grundfos pump reduce energy bills, minimise maintenance requirements, and extend system lifespan – making it a sustainable choice for eco-conscious home heating.