The Baxi 7223558 is a genuine OEM 20-plate domestic hot water heat exchanger designed for use in Baxi Combi Instant, Duo-tec, and Platinum boilers. This component transfers heat from the primary system water to the domestic hot water supply, ensuring strong, consistent hot water flow on demand.

Over time, plate heat exchangers can become restricted by scale, debris, or sludge build-up, leading to fluctuating water temperature, reduced flow rate, or hot water failure. Replacing it with this genuine Baxi part restores full heat transfer efficiency and reliable hot water performance.

Key Features:

• Genuine Baxi 20-plate DHW heat exchanger

• Provides rapid and efficient hot water heating

• Designed for Combi Instant, Duo-tec & Platinum boilers

• Strong thermal efficiency for stable hot water temperatures

• Helps resolve plate blockage, temperature fluctuations & low flow

• Built to Baxi’s strict OEM quality standards

• Durable stainless-steel construction

• Direct-fit replacement for quick, professional installation

Compatibility

The Baxi 7223558 DHW Heat Exchanger is compatible with:

• Baxi Combi Instant

• Baxi Duo-tec (Combi models)

• Baxi Platinum (Combi models)

• Additional Baxi/Main/Potterton models listing 7223558 in official documentation

Common boiler ranges include:

• Duo-tec Combi

• Platinum Combi

• Combi Instant HE / HE A

Installers should always confirm exact model compatibility using the boiler’s service manual or parts breakdown.