The Vaillant 065131 Secondary Heat Exchanger – 12 Plates is a genuine replacement component engineered to support efficient domestic hot water production in compatible Vaillant boiler systems. In condensing combi boilers, the secondary heat exchanger takes heat from the primary circuit and transfers it into the potable water circuit without mixing the two, ensuring rapid, stable hot water delivery. This 12-plate configuration is designed for effective thermal transfer while maintaining compact size and reliable performance.

Compatibility for the 065131 secondary heat exchanger includes Vaillant Turbomax Plus VUW and Vaillant Pro VUW combi boiler models that require a 12-plate secondary exchanger. Always verify your boiler’s exact model and parts specification before installation to ensure correct fit and optimal performance.

Using a genuine Vaillant secondary heat exchanger helps maintain efficient heat transfer for hot water, 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.