Using small appliances
So long as you use common sense and follow the manufacturer's instructions, small appliances should give you years of trouble free service. It is true that cheaper appliances will generally have inferior components than those from more expensive brands. All kettles, coffee machines and irons can be affected by hard water. This may be largely be cosmetic initially, but as limescale develops over time, they will use more energy and could even burn out heating elements.
You may notice limescale on taps, in the base of kettles or on the heating element. Devices that heat water are more prone to limescale build up. You may well see white deposits being left on clothes as you iron. That's a sign that your iron has limescale build up.
Although it's relatively straight-forward to remove limescale, it's best to 'keep on top' of limescale build up, particularly in coffee machines with a water reservoir and inaccessible filters. The fine holes can very easily become clogged and if left too long, can become almost impossible to rescue or repair.
The impact of limescale build up can be reduced by using filtered water in your coffee machine or deionised water in your iron. Although some people like to filter their drinking water to remove traces of chemicals such as fluoride, the dissolved minerals are actually beneficial to the human body, just not your appliances' heating elements.