The Vaillant 178973 Heat Exchanger – DHW 20 Plates is a genuine high-quality replacement component engineered to optimise domestic hot water performance in compatible Vaillant boilers. This 20-plate heat exchanger is designed to transfer heat efficiently from the boiler’s primary circuit to the domestic hot water (DHW) circuit, ensuring rapid and reliable delivery of hot water at a consistent temperature. Manufactured to Vaillant’s exacting standards, it supports efficient heat exchange, reduces energy waste, and helps maintain dependable performance when fitted by a qualified heating engineer during servicing or repair.

Compatibility for the 178973 DHW heat exchanger includes Vaillant ecoTEC Plus R1 and ecoTEC VUW R1 boiler models that use this specific 20-plate domestic hot water exchanger. Always check your boiler model and part requirements before installation to ensure correct fit and optimal performance.

Using a genuine Vaillant DHW heat exchanger helps maintain efficient domestic hot water production, supports stable temperature delivery under varying demand, and contributes to the long-term reliability and energy-efficient operation of your heating and hot water system.