Grateful for any thoughts on possible causes of the corrosion on this 3 year old Baxi boiler. This is the return line just before it enters into the fired part of the boiler. It’s an open system; the pump is just upstream and the F/E tank line is just downstream (of the boiler) We installed to replace the original gas boiler that was 15-20 years old and had no signs of corrosion (at least externally). The heating system was zoned at the same time we had the boiler replaced and we have a serious high point in the downstairs loop. Any thoughts are appreciated
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