The Vaillant 065088 Secondary Heat Exchanger – 12 Plates is a genuine replacement component designed to efficiently transfer heat between the boiler’s primary heating circuit and the domestic hot water system in compatible Vaillant combi boilers. This 12-plate secondary heat exchanger plays a crucial role in delivering hot water on demand by allowing heat to pass rapidly and efficiently without mixing the two water circuits. When functioning correctly, it ensures consistent hot water temperature, good flow rates, and energy-efficient operation.

Manufactured to Vaillant’s strict quality and performance standards, this secondary heat exchanger is built for durability and reliable thermal transfer. It is intended to be fitted by a qualified heating engineer during servicing or repair, particularly when issues such as fluctuating hot water temperature, reduced flow, or internal blockage are present.

Compatibility for the Vaillant 065088 secondary heat exchanger includes a range of older Vaillant combi boiler models that use a 12-plate design, including selected TURBOmax Plus and TURBOmax Pro models, as well as early VUW series combination boilers that require this specific specification. Always confirm the exact boiler model and part requirement before installation to ensure correct fit and performance.

Using a genuine Vaillant secondary heat exchanger helps restore efficient domestic hot water production, supports stable boiler operation, and contributes to the long-term reliability and performance of your heating and hot water system.