Baxi Duo-tec 24HE 28HE 33HE 40HE Diverter Valve – Refurbished | Part No. 5118381

The diverter valve on a Baxi Duo-tec HE combi boiler is responsible for switching the flow of heated water between the central heating circuit and the domestic hot water circuit on demand. It is one of the most frequently replaced components on this range, as the internal rubber seals degrade over time — particularly in hard water areas where limescale accelerates wear on the valve spindle and seat. A failing valve typically causes the boiler to deliver heating only with no hot water, hot water only with no heating, or to switch erratically between modes. In some cases, a partially stuck valve causes simultaneous bypass between both circuits, resulting in lukewarm hot water and reduced heating output. The Baxi Duo-tec 24HE / 28HE / 33HE / 40HE Diverter Valve (Part No. 5118381 / 7224763) is the correct OEM replacement for a reliable, like-for-like repair.

This is a professionally refurbished genuine Baxi diverter valve. Each unit is fully disassembled — the valve body, internal seals, O-rings, rubber diaphragm, and spindle are all inspected and replaced as required. The valve is then reassembled, pressure-tested for hydraulic integrity, and function-cycled through multiple actuation sequences to confirm smooth, positive, full-travel switching in both directions before dispatch. You receive full OEM-spec switching performance and seal quality at a significant saving over a new replacement part.

Compatible Boiler Models

OEM Quality. Proven Performance. Backed by Warranty.

Every refurbished diverter valve we supply is pressure-tested and cycle-verified before dispatch. This 5118381 (cross-ref: 7224763) valve restores reliable CH-to-DHW switching, eliminates stuck-valve and bypass-leak symptoms, and returns the boiler to full combi operation across the Duo-tec HE range. Supplied with a full 12-month warranty, it is a proven cost-effective repair for one of Baxi's most widely installed combi boiler families.

Delivery & Returns

Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day, with standard (2–3 working days), next-day, and Saturday delivery options available at checkout. Returns are accepted within 30 days, provided the item is unused and in its original packaging.

Note: Please confirm that part number 5118381 (cross-ref: 7224763) matches your existing valve before ordering. Installation must be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.