i have had several of these heat exchangers leak like this 
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Drop in combi pressure - worcester bosch
- Thread starter elgar
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anything that uses that big square h/e. quite a few of the greenstars models used them befroe they started using that pain in the arse tubular h/e.
usually the obvious signs are an awful lot of topping up and the biggest plume you have ever seen from a condenser.
simple to change though.
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