Where deposits can accumulate
As water is heated, dissolved minerals can leave deposits. In a tank they can settle at the bottom. In a tankless system, deposits can form inside the heat exchanger. Your local water utility may publish a water quality report with hardness information.
Pay attention to changes
Rumbling, declining flow, or reduced output can be worth investigating. These symptoms can have more than one cause, so note when the change started and whether it affects multiple fixtures.
Make a model-specific care plan
Check the manufacturer’s service recommendations and ask whether flushing, descaling, or compatible scale control makes sense. Mention any treatment equipment already installed so the technician can evaluate the system together.
