The Viessmann 7828746 Plate Heat Exchanger – 20 Plates (DHW) is a genuine replacement domestic hot water heat exchanger designed to deliver efficient and reliable hot water performance in compatible Viessmann combi boilers. This 20-plate exchanger transfers thermal energy from the boiler’s primary heating circuit into the domestic hot water circuit, ensuring rapid heat transfer and consistent water temperature delivery even under varying demand. Manufactured to Viessmann’s exact quality and durability standards, it should be installed by a qualified heating engineer during servicing, maintenance, or replacement of a worn, scaled, or underperforming exchanger.

This 20-plate DHW heat exchanger is compatible with Viessmann combi boiler models that utilise this specific plate configuration for domestic hot water production. Always verify your boiler’s exact model and part specification before installation to ensure correct fit and dependable performance.

Using a genuine Viessmann plate heat exchanger helps maintain efficient heat transfer, supports stable hot water delivery, and contributes to the long-term reliable and energy-efficient operation of your central heating and hot water system.