Kitchen water heaters are becoming a common appliance in many households. But how do you choose the right one? Which brands are reliable? And what should you do if your kitchen heater isn’t heating up? In this article, we’ll walk you through everything you need to know about kitchen water heaters and how to maintain them properly.

When using a kitchen water heater, it's important to avoid mixing hot and cold water directly, as this can affect the performance of the unit. Also, after use, make sure to turn on the faucet for a few seconds before closing it. This helps flush out any remaining water and reduces thermal stress on the internal components, thus extending the lifespan of the heater. Proper maintenance can ensure that your kitchen water heater lasts more than 10 years without major issues.
It's essential to remember that the hot water from a kitchen water heater is only for washing or rinsing, not for cooking. Especially with storage-type models, the magnesium rod inside the tank plays a key role in protecting the inner tank and heating element. However, over time, the magnesium rod will corrode and dissolve into the water, which can lead to potential health risks if used for food preparation.
The magnesium rod in a kitchen water heater is typically made of a magnesium alloy, and contains other metals like iron, nickel, and copper. As the rod degrades, these metals can leach into the water. Additionally, when the water is heated, chemical reactions may occur within the tank’s coating, pipes, or materials, potentially releasing harmful substances into the water. Using such water for cooking or drinking is not advisable due to health concerns.

How to Choose a Kitchen Water Heater
Choose Based on Your Needs
Storage-type kitchen water heaters are generally more affordable and have lower power consumption. They don’t require heavy electrical loads, making them suitable for most homes. However, they have limited capacity—usually around 5-6 liters—which means the hot water runs out quickly. Before purchasing, consider your household's usage and whether you need a larger or more efficient model.
Check the Water Inlet Direction
When buying a kitchen water heater, pay attention to whether it requires “upper water†or “lower water.†“Upper water†means the unit is installed below the sink, while “lower water†means it’s placed above the faucet. Most modern models support both, but some only have one type, so make sure to match it with your installation setup.
Consider the Power Rating
Kitchen water heaters are electric appliances, usually operating at around 4000 watts. Make sure your home’s electrical circuit can handle this load—ideally, a 2.5mm² wire is recommended. If you live in an older house, check your wiring carefully to avoid overloading. Avoid purchasing high-power models unless necessary, as they can cause sudden power surges.

What to Do If the Kitchen Heater Isn’t Heating?
Since kitchen water heaters are small electric units, there are several possible reasons why they might not be heating. Here are the most common causes:
- 1. The unit hasn't been cleaned or maintained for a long time.
- 2. The power level is set too low (especially for models with multiple power settings).
- 3. There is a lot of scale buildup inside the tank or on the heating element, reducing efficiency.
- 4. The heating element is damaged and needs replacement.
Solutions:
- 1. Clean the inner tank and replace the magnesium rod.
- 2. Set the power to the highest setting if available.
- 3. Replace the heating element if it's faulty.
We’ve covered the basics of kitchen water heaters, from choosing the right model to troubleshooting common issues. If you still have questions, feel free to leave a comment below, and we’ll respond as soon as possible.
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