When you try to figure out what the best way to make coffee is by doing a bit of research that generally involves reading up on a fairly significant number of online resources, chances are that the widely differing opinions that you would be exposed to would probably end up leaving you scratching your head at this current point in time. Some people say that you should always use hard water to make coffee, but others suggest that doing so would ruin your coffee makers without a shadow of a doubt.
Being given two viewpoints that seem to be completely at odds with each other can be disorienting to put it mildly, and as a result of the fact that this is the case we are going to put this matter to rest once and for all. The main benefit of using hard water to make coffee is that the minerals in this kind of water such as magnesium can actually do a lot to improve the flavor of your brew. With that having been said, you should know that unless you buy a specially made product from https://coffeeshan.com/best-coffee-makers-for-hard-water/, suffice it to say that your machine would start to get blocked by the sediment which can make hot water leak into its innards thereby damaging it.
The people that like to use hard water for their coffee are most likely using something like a French press instead of a proper coffee machine. Hard water leaves a lot of residue inside of coffee makers, and unless you open them up and clean them frequently this residue can accumulate until eventually it obstructs the pipes that let hot water flow out.