3. Type of heating item on the shelves today presented two types of dummies, different in form of heating element installed in them. The first group - a model with an open spiral to the pluses that include low noise operation and low cost. But they also have a serious drawback - the bottom of a spiral is very difficult to clean, besides the open spiral settles more scum. (A valuable related resource: real sports). Teapots with closed heating element (drive) a little expensive, but they are much easier to clean and the water in such devices is heated quickly.
4. What filters are in a teapot? In many, even the most simple models Dummies installed filters. But it is not worth entertain the hope that they clear water of harmful contaminants - they just mechanically prevent the ingress of stones in the cup. Such filters are installed in the spout and can be made of nylon or stainless steel, they can be as removable or not. Some models are equipped with two such "mechanical" filters - one protects against ingress of lime into the cup, and the second - from getting small foreign particles from tap water. Some manufacturers have developed a special filtration system for electric kettles. For example, the firm uses a filter Philips Double Action, which works in two ways: a special part of the filter keeps the scum, as a regular component prevents the particles of lime in the drink. Teapots with full built-in filters for water purification in the Russian market are presented in a small range.

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