Grundfos UPM3 Underfloor Heating Pump FLEX. The Constant Curve setting on a pump is especially well-suited for underfloor heating systems. 25-70 130 AZA / 93008970. Plumbing & Heating Supplies. Energy Efficiency: With an EEI of ≤ 0.20, this pump significantly reduces energy usage, lowering your heating system's operational costs.
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