Hot water system fault

[ubeaut]

I have a unit with an internal hot water system installed. The brand is Chaffoteaux et Maury. I have noticed lately that there seems to be condensation appearing on the outside, which turns to steam when the unit heats up. I am wondering if this is a fault. I cannot see water leaking anywhere, so what is causing the condensation, and does the unit need repair or replacement? Is this normal?


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