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It is well established general info - you can find it anywhere. This quote from water treatment information... "As the water temperature increases, the more mineral deposits will appear in your dishwasher, water tank and pipes. By reducing the heat of your boiler to about 55ºC (130 degrees)...

Tankless water heaters are pre set around 120 degrees and scaling usually begins above 120. A tankless holds no water. In traditional water tanks the temperature is set at 140 degrees (required in many states) and scaling builds up on the stationary coils. So with a tankless unit it is not...