Impacts of Water Quality on Residential Water Heating Equipment
Accumulation of scale and corrosion can decrease the lifespan and impact performance of water heating equipment; in fact, studies have shown corrosion to decrease equipment life by more than half if not properly mitigated.
Impact of water hardness on energy consumption of geyser heating elements
In 2017 the Eskom Research Center tested the impact of water hardness on energy consumption in domestic geysers/ water-heaters. The test discovered mineral scaling led to an increase in power consumption.
Influence of Water Scale on Thermal Flow Losses of Domestic Appliances
In 2007 an independent scientific study was published in an International Journal proving mineral scale buildup impacts energy efficiency by 10% to 60%; depending on the mineral scale thickness.
Source: Good House Keeping