We have a Bunn water tower that we are using for a manual pour-over bar at our shop. Recently, during a high volume period, the water tower started shaking and put off a lot of steam. It sounded like the water was at a rolling boil inside. Initially I thought this was due to the machine working too hard while trying to catch up, but then we had the same problem occur again on sunday when we are closed (not high volume). Does anyone have any thoughts on what the source of the problem could be?
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