Electric water heater explosion, no more than three reasons.

1. The temperature is too high, the design temperature of the electric water heater is generally 75 ℃, a little higher may be able to reach 80 ℃. If the water temperature in the liner is too high, it will burn the liner, resulting in a broken liner, which will cause an explosion.

2. The liner is broken, some electric water heaters are starting to leak, but users are still using. The liner is broken, which will lead to a local pressure drop in the liner. Boiling water temperature increases, the water will overflow from the breakage to the outside. Water temperature is getting higher and higher, more and more water overflow, it will crack the liner, until the explosion.

3. too much pressure, the pressure inside the liner is getting bigger and bigger, it bursts the liner. Why does the pressure inside the liner become larger? The most common reason is that there is air in the liner, the deformation of the gas after heat is much larger than the water, the liner is propped up.

From these three points above alone, it seems that the electric water heater will easily explode. But the reality is not so easy - electric water heaters have protection devices, long for the "prevention of explosion" ready.

1.Prevention of high temperatures, electric water heaters installed a thermostat and an overheating protection device. The thermostat is used more frequently, its main role is to monitor the water temperature. Usually use, the water temperature rises to the set temperature will stop heating, which is the thermostat to give the order.

Overheating protection device is an emergency device, when the thermostat is bad, there is no timely order to stop, the water temperature will always rise. When the water heater can withstand the highest temperature (80 ℃), the overheating protection device will start, cut off the power of the water heater.

2. prevent the inner liner from breaking, the electric water heater is also equipped with two devices: magnesium rod and coating. The main component of the magnesium rod is magnesium, the main component of the liner is iron. Magnesium is chemically more active than iron, will take the lead in combining with scale, actively corroded by scale, thus preventing the inner liner from being corroded (sacrificial anode protection method).

Coating, can be understood as enamel. We have all seen enamel cups, enamel pots and pans, right, is a smooth surface outside the metal, this layer of surface can prevent the metal hidden inside from harm.

3. Prevention of excessive pressure, electric water heaters installed a pressure relief valve at the water inlet. Pressure relief valve will be marked with a value, when the pressure inside the electric water heater exceeds this value, the valve can be automatically topped off the pressure relief valve, drainage pressure relief, to prevent excessive pressure in the liner.

The "correct use" to prevent explosions

Since this is the case, why can still occasionally see the news of electric water heater explosion? In the words of the master: "then a full range of protection, but also can not protect the user with the indiscriminate use."

1. thermostats and overheating protection devices, are lifespan. General electric water heater life is five or six years, some users with more than a dozen years are not replaced, these protective devices fail is also a very normal thing.

Especially when we find that the water heater heating temperature is not allowed, must be alert to this point. The repair will be repaired, the replacement will be replaced. Do not make do with, take their own life safety as a child's play.

2. "Sacrificial anode protection method" in the anode metal is a consumable, in the electric water heater, magnesium rod is the first to be corroded by scale. Although the protection of the liner, but the sacrifice of magnesium rod. So a long time, the magnesium rod in the electric water heater will be left with very little. At this time, the magnesium rod should be replaced in a timely manner.

As for the coating, generally speaking it is difficult to break. But if there is more sediment in the tap water, it will also cause damage to the coating. Damage to the liner will soon leak - found leaking, should promptly replace the electric water heater, the repair alone is unable to restore the coating.

3. Pressure relief valve is prone to two problems: pressure relief valve has a small screw next to the valve, individual users tighten this screw. The valve of the pressure relief valve is loose so that it can be opened by the pressure top. After tightening, the pressure relief valve will not be able to release pressure.

The pressure relief valve is prone to two problems: there is a small screw next to the valve of the pressure relief valve, and individual users tighten this screw. The valve of the pressure relief valve is loose, so that it can be opened by the pressure. After tightening, the pressure relief valve can not release pressure.