Now, the electric heater on the market, and are equipped with all kinds of normal temperature controller or thermal protector. This kind of fittings can let the heated water disconnect circuit after test point temperature reached set value, stop heating; When the test point temperature to a lower limit value, the device will be automatically closed. Many electric heater manufacturer put electricity in the air for a demonstration of your products with the thermostat, to prove that their products can "dry". In fact, the so-called dry prevention propaganda, if not the manufacturer is deliberately misleading, there is the manufacturer the conceptual misunderstandings. In fact, the presentation itself rather than that of its product can prevent dry! The opposite proved in the absence of water in this product ?