The risk of electrical short circuit is reduced;

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Open heating elements are in direct contact with water. Their main advantage is the high speed of heating the liquid and low cost, but they also have significant disadvantages:

limited service life;
rapid formation of limescale;
high power consumption;
insecurity.
Closed ones do not come into contact with water. The heating element is protected by a durable flask. Its advantages:

easy to repair and maintain;
last a long time – three times longer than open heating elements;
consume significantly less electricity spain mobile databaseopen-type heating elements.
There are two important disadvantages: high price and slow water heating.

How to connect a heating element with a thermostat
Now you know how and by what parameters heaters are selected. But how is the connection made? In order to connect a heating element with a thermostat, it is necessary to select a wire with reliable insulation

We also pay attention to the cross-section - it should be such that the wire can provide full power to the heater and not melt.
For example, for a heater with a power of 3 kW, the cross-section of the wire should be at least 2.5 mm. We recommend choosing cables with copper conductors for connection

Don't forget to pay attention to the presence of an RCD - it will instantly turn off the power in case of an unexpected failure of the heating element or a short circuit. The RCD must be installed as close as possible to the heater itself.

It is also necessary to ensure a reliable connection of the conductors with the heating element contacts (without “snot” and flimsy contacts that can spark).