Hi Ian - thanks - the green stuff in the picture on the HX is that copper oxide ? I note that their is no longer a hissing / whistling sound when the boiler is running - would that have been the boiler kettling with the old HX ?
Ian looking at the rust in the back corner at the top of the side panel of the combustion chamber does this look to you as if it has been leaking for some time ? The rust would not have developed overnight ?
yes been leaking for a long time , the new insulation panels should stop it, it does become a problem if the metal housing gets so bad that it corrodes through
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