Baxi Diaphragm Kit Dhw Combi 80E 105E 5111137

Pressure Differential Valve Combi 24HE, 30HE, 80E, 105E, 105HE Performa 24 ECO, 30HE

The Baxi Diaphragm Kit (5111137) is a genuine replacement domestic hot water (DHW) diaphragm designed for use in Baxi Combi 80E and Baxi Combi 105E boilers. The diaphragm is a key component in the water-to-gas activation system, controlling boiler ignition when a hot water tap is opened.

Over time, diaphragms can harden, split or lose flexibility, resulting in poor hot water performance, intermittent firing or no DHW ignition. Replacing the diaphragm restores correct hot water demand sensing and reliable boiler operation.

Key Features

• Genuine Baxi DHW diaphragm kit – Part No. 5111137

• Designed for Combi 80E and Combi 105E models

• Ensures proper DHW flow activation and burner ignition

• Restores consistent hot water performance

• Made from durable, heat-resistant elastomer

• Quick, straightforward replacement during servicing

• Essential for maintaining reliable combi boiler function

Compatibility

• Directly compatible with:

  • Baxi Combi 80E

  • Baxi Combi 105E

• Fits the DHW water section on these boiler models

• OEM-spec replacement for part number 5111137

When to Replace

• No hot water when taps are opened

• Boiler fails to ignite on DHW demand

• Intermittent hot water or fluctuating temperature

• Reduced flow or boiler short-cycling on hot water

• Annual boiler service or when water section shows wear

Technical Specifications

• Manufacturer: Baxi

• Part Number: 5111137

• Component: Domestic Hot Water Diaphragm

• Material: High-grade elastomer

• Application: DHW activation / water section diaphragm

• Suitable For: Baxi Combi 80E & 105E