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I am just about to attempt a DHW heat exchanger replacement on the Vaillant VCW 242/282 combi for the newer 'sardine can' type. I have been told to replace the disc in the diverter valve if I do but the heat exchanger kit doesn't include one and I was wondering whether this is necessary and if...

Hi I have a Vaillant VCW 242/282 combi with a leaky DHW heat exchanger. I have read some of the other posts about this as it seems fairly common with the older Duralite (I think its Duralite anyhow, the black plastic looking one) models. I have bought the new "sardine can" upgrade which...