The Baxi 5112431 Primary Heat Exchanger – 105 is a genuine replacement component engineered to deliver dependable and efficient heat transfer in compatible Baxi boiler systems. This primary heat exchanger transfers thermal energy from the combustion process into the boiler’s primary water circuit, where that heat is then used to warm your central heating system and, in combi models, domestic hot water. Manufactured to Baxi’s exact quality and performance standards, it provides long-lasting reliability and efficient thermal performance when installed by a qualified heating engineer during servicing, maintenance, or part replacement.

Compatibility for the 5112431 primary heat exchanger (105) includes Baxi boiler models that utilise this specific exchanger size and design, typically within the 105 specification range. Always confirm your boiler’s exact model and parts requirements before installation to ensure the correct fit and optimal performance.

Using a genuine Baxi primary heat exchanger helps maintain efficient heat transfer, supports stable temperature delivery under varying demand, and contributes to the long-term reliable and energy-efficient operation of your central heating and hot water system.