1-A low, rumbling noise can indicate boiling water, caused by overheating due to sediment build-up. Treat this by flushing the water heater.
2-A high-pitched, whining noise can be caused by build-up of scales on electrical heating elements. To treat this, first flush the water heater. Then clean the scales from the water heater tank and elements. Finally, install low-watt-density heating elements with a larger surface area for greater heat-transfer efficiency.
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