In the early days, when both storage-type and instant electric water heaters hit the market, the former quickly gained popularity while the latter was met with a lukewarm reception. However, times have changed. Recently, according to insiders from a major shopping mall, the instant electric water heater market is showing strong signs of growth, with many units selling out on a daily basis.
An instant electric water heater, also known as a quick-heating or flow-through type, works by placing a heating element inside a coiled tank. As cold water flows through this system, it comes into direct contact with the heated surface repeatedly, allowing for rapid temperature increase. With high-power current, hot water can be delivered almost instantly at the tap. Recent models feature design improvements, using semiconductor and nickel-chromium alloy heating elements, along with an external wraparound circulation tube system, which enhances both speed and thermal efficiency. The result is that cold water in, hot water out—within just a few seconds, you get continuous hot water.
In contrast, storage-type electric water heaters use a carbon heating rod that heats the surrounding water before transferring the heat throughout the tank. This indirect method means longer preheating times, especially in winter, when it may take up to two hours before hot water is ready. Additionally, these units are bulky and require significant space, often making bathrooms feel cramped. Even in larger homes, their large tanks can look unattractive and awkwardly placed.
From an energy efficiency standpoint, many people believe that higher power equals higher electricity consumption. However, this isn’t always true. Although storage-type heaters consume less power during operation, they continuously use energy for preheating and maintaining heat, leading to greater overall consumption. Instant electric water heaters, though using higher power, operate for shorter durations without waste, resulting in more efficient energy use. For example, in winter, a 3 kW storage heater might consume 4.5 kWh over the course of a shower, while a 6 kW instant model only uses 3 kWh—making it significantly more energy-efficient.
Another key advantage of modern instant electric water heaters is their rear-mounted control system. Unlike older models that relied on front-mounted valves to regulate temperature and flow, newer designs allow for easier installation and use. They can control the amount of hot water released and support multiple water outlets, making them ideal for kitchens, sinks, and showers. This makes them far more convenient than traditional storage heaters.
Installation is another factor where instant electric water heaters shine. Their compact size and lightweight design make them easy to mount on walls, often at eye level for convenience. For instance, the Aotelang fast electric water heater features a digital display and intuitive controls, allowing users to adjust temperature with a simple touch, making the experience user-friendly.
However, one challenge remains: the need for a power line with a cross-sectional area of at least 4 mm² and a capacity of 40A. Many older residential buildings still have outdated electrical systems, which has limited the adoption of instant heaters. But with ongoing upgrades to urban power grids, new housing developments now meet these requirements, with incoming lines of at least 10 mm² and 20–40A capacity. This bodes well for the future of instant electric water heaters, which are expected to become a popular choice in households, much like how color TVs replaced black-and-white ones.
Safety features such as overheating protection, overpressure prevention, anti-smoke, anti-leakage, and water-electricity separation are now standard in most instant models. Advanced microcomputer control ensures reliable performance. Brands like Dr. Autland and Ariston are already leading the market with innovative and safe products.
As technology continues to evolve, the instant electric water heater is set to become a must-have in many homes, offering convenience, efficiency, and modern design in one sleek unit.
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