I want to give them the benefit of the doubt and say perhaps it’s a deep freezer that is only opened occasionally, and I guess is pretty well sealed as long as it’s closed.
The kitchen appears to have one of those built-in fridges that matches the cabinets:
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Maybe it’s a hot water tank? They can often look fridge-like however I’ve never seen one like that.
That is definitely not a hot water cylinder, it’s free standing.