Vaillant 178973 Heat Exchanger – Fits Ecotec Plus 824 & 831 – hardly used
Genuine Vaillant 178973 Heat Exchanger. Designed to fit the Ecotec Plus 824 & 831 models. Fitted after a power flush only to find the main heat exchanger had gone in the boiler. The boiler was replaced and this basically new part was recovered.