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How to choose electric water heater?
When it comes to choosing an electric water heater, the market offers a wide range of options that can be overwhelming for many consumers. With so many choices available, how do you find a reliable, safe, and long-lasting model? The key lies in understanding a few essential factors before making your purchase.
First, pay attention to the main components and their performance. One of the most important parts is the inner tank material. There are three common types: stainless steel, enameled, and galvanized. Stainless steel tanks are the highest quality, made from premium imported materials and using advanced welding techniques that ensure a lifespan of over 15 years. They are more expensive but ideal for those with a higher budget.
Enameled tanks are a mid-range option, popular in Europe. They are made by baking a ceramic glaze onto steel plates, offering good corrosion resistance at a lower cost—about one-sixth to one-fourth of stainless steel. High-end models use advanced processes like 360-degree rotary boring and wet enamel technology to ensure full coverage and durability. These models are widely used in modern electric water heaters due to their balance between price and performance.
Galvanized tanks, on the other hand, are the lowest quality. They are prone to rust and have a shorter lifespan, making them less desirable. They are often found in cheaper products that are now mostly out of the market.
Next, safety features are crucial. Look for models with ground protection, dry-run prevention, over-temperature and over-pressure safeguards, and fast-acting leakage protection. A good water heater should shut off power within 0.1 seconds if there's a 15 mA leakage. Some models even include additional safety indicators for no-water or power-off situations.
Insulation is another key factor. Better insulation means lower energy consumption. The thickness and density of the insulation material matter. Newer models use polyurethane foam technology, which creates a dense, thick layer (4–6 cm) that significantly reduces heat loss. This allows the unit to retain hot water for up to two or three days.
When choosing capacity, consider the number of people in your household. A 30–40L unit works well for 3–4 people, while a 70–90L model is better for larger families. Some modern models use "capacity-increasing" technology, such as e+ compatibility, which allows for more hot water than the actual tank size. For example, a 60L model might provide up to 235L of hot water, extending bathing time by about 10 minutes.
Additional features like constant temperature control, magnetic water treatment, and anti-scaling functions can enhance user experience and health benefits. Constant temperature ensures a stable flow of hot water, reducing the risk of burns. Magnetic water treatment may improve water quality, and descaling functions help maintain the heater’s efficiency over time.
Brand reputation is also important. Choose well-known brands with strong after-sales support. Companies like Midea offer reliable products, professional installation, and comprehensive service. Always check for official certifications and avoid counterfeit products, which may look cheap and perform poorly.
Finally, inspect the product carefully. The exterior should be smooth, without dents or scratches. All controls should be functional, and the display should be clear. When testing, ensure the thermostat works properly and the heater turns off automatically when the desired temperature is reached.
By considering these factors, you’ll be able to make a smart and informed decision when purchasing an electric water heater.