ATAG / Grundfos UPM3 15-75 High-Efficiency Pump – Refurbished | Part No. S4856100

Circulation failure and poor heating output in an ATAG iC Economiser Plus 27 boiler often trace directly to a failing pump. The Grundfos UPM3 is a high-efficiency modulating pump — when it fails, the boiler loses the adaptive flow control that makes the iC Economiser range so efficient. The Grundfos UPM3 15-75 ATAG Pump (Part No. S4856100) is the correct refurbished replacement, restoring full high-efficiency circulation and adaptive pump control for the ATAG iC Economiser Plus 27 (GC No. 47-310-27).

This is a professionally refurbished genuine Grundfos/ATAG component — fully stripped, cleaned, and run-tested by our engineering team before dispatch. Each unit is quality-checked and supplied with a full 12-month warranty. Minor cosmetic marks may be present. Currently out of stock — contact us for restock updates.

Compatible ATAG Models

Technical Specifications

Refurbished. Tested. 12-Month Warranty.

Every refurbished ATAG/Grundfos pump is quality-checked and run-tested before dispatch. This S4856100 unit restores high-efficiency adaptive circulation in the ATAG iC Economiser Plus 27. Supplied with a full 12-month warranty.

Delivery & Returns

Orders placed before 3:00 PM (Mon–Fri) are dispatched the same working day. Standard and next-day delivery available at checkout, including Saturday. Returns accepted within 30 days.

Note: Please confirm that part number S4856100 matches your existing pump before ordering. Must be fitted by a Gas Safe registered engineer.

Product Reference