Storage-type electric water heaters are large in size, and when the internal temperature is 80°C, it is easy to produce scale. Easily cause the heating tube to rupture. There is a hidden danger of leakage. Generally, it needs to be cleaned up regularly. Water heaters that do not store water include instant electric water heaters and gas water heaters. If you want to consider an instant electric water heater, you need to walk a separate wire of at least 4-6mm when you turn on the bathroom, so as to ensure the power of the water heater. However, there are certain hidden dangers. The safest and most reliable hot water supply equipment today is an air-energy water heater. Its electric current and shower water are completely isolated. And its electricity consumption is 28% of traditional electric water heaters. Can save a lot of electricity bills.