The Baxi 5111137 DHW Diaphragm Replacement Kit is a genuine replacement component designed to restore proper performance of the domestic hot water (DHW) control valve in compatible Baxi combi boilers. This diaphragm forms a flexible, pressure-responsive seal inside the valve, allowing it to correctly divert hot water to the DHW circuit when there is demand at a tap or shower. Over time, diaphragms can harden, stretch, or deteriorate, which can lead to erratic hot water flow or valve sticking; replacing it with this genuine kit helps restore smooth and reliable operation.

This diaphragm replacement kit is compatible with Baxi combi boiler models that require the 5111137 specification for their DHW control valve. Always confirm your exact boiler model and part requirements before installation to ensure correct fit and dependable performance.

Using a genuine Baxi DHW diaphragm replacement kit helps maintain accurate water routing, supports consistent hot water delivery under varying demand, and contributes to the long-term reliable operation of your central heating and hot water system when fitted by a qualified heating engineer.