Many people feel confused during bathroom renovation when choosing a suitable water heater. There are storage‑type electric water heaters, instant‑electric water heaters, rapid‑heating electric water heaters and many other models from numerous brands, which easily cause decision fatigue. In fact, you only need to make a choice based on your actual conditions. If your bathroom has sufficient space, any type will work. For small‑size bathrooms, compact instant‑electric or rapid‑heating models are recommended.
The storage‑type electric water heater is the mainstream product on the current market, while instant‑electric and rapid‑heating types are rising‑star products. Though they have been introduced into China for only 30 years, they have captured a certain market share. The final choice still depends on real‑world household conditions. Today we make a simple comparison between storage‑type and instant‑electric electric water heaters for your reference.
1. Heating Speed Comparison
As we all know, storage‑type water heaters require long heating time due to power constraints. Their power rating is generally around 2000 W, and heating takes 30 minutes to 2 hours depending on tank capacity. In contrast, instant‑electric water heaters run at approximately 5000 W with merely about 5 minutes of pre‑heating before use. In mild seasons such as spring, autumn and summer, faster hot‑water output can be achieved with lower temperature settings. Its average annual power consumption stands at around 4 kW. Calculated based on a 10‑minute shower per person, the power cost is roughly 0.5 RMB per shower.
2. Energy‑saving Performance Comparison
Energy‑saving performance mainly depends on whether power is wasted during operation. For 24‑hour hot‑water supply mode, storage‑type water heaters keep consuming nearly 2 kWh of electricity for heat preservation to offset heat loss. Hot water is pushed out by incoming cold water. Once the water temperature drops below 40 ℃, further cold‑water inflow will make the temperature too low for bathing, and residual hot‑water inside the tank gets wasted.
Instant‑electric water heaters require no pre‑heating or hot‑water storage. Boasting a high thermal efficiency above 95%, they consume electricity only for the hot‑water actually used with barely any waste. Therefore, instant‑electric water heaters are regarded as energy‑saving representatives in the current market.
3. Space Requirement Comparison
The difference is quite obvious. Storage‑type electric water heaters adopt bulky inner water tanks for hot‑water storage and occupy considerable space. Instant‑electric water heaters feature compact size, elegant appearance and easy installation, making them ideal for small‑sized urban bathrooms.
4. Installation Comparison
Equipped with water‑storage tanks, storage‑type electric water heaters are large and heavy when full of water. They must be mounted on load‑bearing walls and take up substantial room. Instant‑electric water heaters are small‑sized with flexible installation options. They can be fitted in bathrooms or corridors as long as water pipelines are reserved in advance, delivering better installation flexibility.
5. Volume Comparison
The volume of storage‑type electric water heaters is determined by tank capacity. Even a small‑capacity 40‑liter model is more than twice the volume of an instant‑electric water heater. Hence instant‑electric units are much more compact.
6. Cleaning & Maintenance Comparison
Instant‑electric water heaters heat running flowing water, so limescale hardly forms. Routine maintenance is unnecessary, and only regular circuit inspection is required.
Storage‑type electric water heaters heat static water stored inside the tank. Limescale will build up on inner walls and heating tubes after long‑term operation. Regular internal cleaning is required, which usually needs professional technicians and brings higher maintenance costs.
Above is the comparison between storage‑type and instant‑electric electric water heaters. This article does not intend to judge which one is superior. Every product exists for its own reason. You may combine the above comparison with your actual bathroom conditions to make your purchase decision. For reference, my household uses a storage‑type electric water heater. It is turned on half an hour before showering instead of running 24 hours a day. Since the bathroom has enough space, it does not cause space‑occupying trouble. Whether you select a water heater or other home appliances, suitability is always the top priority.
