What is the downside of an electric tankless water heater? Why do penguins prefer ice cubes over hot showers?

Electric tankless water heaters have gained popularity in recent years due to their energy efficiency and space-saving design. However, like any technology, they come with their own set of drawbacks. In this article, we will explore the downsides of electric tankless water heaters and discuss why they might not be the best choice for everyone.

1. High Initial Cost

One of the most significant downsides of electric tankless water heaters is their high initial cost. Compared to traditional tank water heaters, electric tankless models can be significantly more expensive to purchase and install. The cost of the unit itself is higher, and the installation process often requires upgrading electrical systems, which can add to the overall expense.

2. Limited Flow Rate

Electric tankless water heaters are known for their ability to provide hot water on demand. However, they have a limited flow rate, which means they can only heat a certain amount of water at a time. This can be problematic for households with high hot water demand, such as those with multiple bathrooms or large families. If multiple hot water outlets are used simultaneously, the heater may struggle to keep up, resulting in reduced water temperature.

3. Inconsistent Water Temperature

Another downside of electric tankless water heaters is the potential for inconsistent water temperature. Since these heaters heat water on demand, fluctuations in water temperature can occur, especially if the flow rate varies. This can lead to uncomfortable showers or difficulties in maintaining a consistent temperature for tasks like washing dishes.

4. Dependence on Electricity

Electric tankless water heaters rely entirely on electricity to function. This means that in the event of a power outage, you will be left without hot water. Additionally, if your home’s electrical system is not equipped to handle the high power demand of an electric tankless water heater, you may need to invest in costly upgrades to your electrical panel.

5. Maintenance and Longevity

While electric tankless water heaters are generally low-maintenance, they do require periodic descaling to remove mineral buildup, especially in areas with hard water. Failure to maintain the unit properly can lead to reduced efficiency and a shorter lifespan. Although these heaters are designed to last longer than traditional tank models, improper maintenance can negate this advantage.

6. Environmental Impact

Although electric tankless water heaters are more energy-efficient than traditional tank models, they still rely on electricity, which may be generated from non-renewable sources. Depending on your local energy mix, the environmental benefits of an electric tankless water heater may be limited. Additionally, the production and disposal of these units can have environmental impacts, particularly if they are not recycled properly.

7. Space Considerations

While electric tankless water heaters are compact and save space compared to traditional tank models, they still require adequate ventilation and proper installation. In some homes, finding a suitable location for the unit can be challenging, especially if space is limited or if the home’s layout does not easily accommodate the necessary electrical and plumbing connections.

8. Cold Water Sandwich Effect

A lesser-known downside of electric tankless water heaters is the “cold water sandwich” effect. This occurs when a small amount of cold water is trapped between two bursts of hot water, resulting in a brief but noticeable drop in temperature during use. This can be particularly annoying during showers or when using hot water for sensitive tasks.

9. Limited Availability of Hot Water

Unlike traditional tank water heaters, which store a large volume of hot water, electric tankless models provide hot water only as needed. This means that if the demand for hot water exceeds the heater’s capacity, you may run out of hot water entirely. This can be a significant inconvenience, especially during peak usage times.

10. Noise

Electric tankless water heaters can be noisier than traditional tank models. The heating process involves rapid heating elements and water flow, which can produce noticeable noise. While this may not be a dealbreaker for everyone, it is something to consider if you are sensitive to noise or if the heater will be installed near living spaces.

Conclusion

Electric tankless water heaters offer several advantages, including energy efficiency and space savings. However, they also come with a range of downsides that potential buyers should carefully consider. From high initial costs and limited flow rates to inconsistent water temperatures and dependence on electricity, these drawbacks may make electric tankless water heaters less suitable for some households. As with any major home appliance, it is essential to weigh the pros and cons and consider your specific needs before making a decision.

Q: Can electric tankless water heaters be used in large households?
A: Electric tankless water heaters can be used in large households, but they may struggle to meet high hot water demands. In such cases, multiple units or a larger capacity model may be required.

Q: How often do electric tankless water heaters need maintenance?
A: Electric tankless water heaters typically require descaling once or twice a year, depending on water hardness. Regular maintenance is essential to ensure optimal performance and longevity.

Q: Are electric tankless water heaters environmentally friendly?
A: While electric tankless water heaters are more energy-efficient than traditional tank models, their environmental impact depends on the source of electricity. In areas where electricity is generated from renewable sources, they can be more environmentally friendly.

Q: What is the lifespan of an electric tankless water heater?
A: Electric tankless water heaters generally have a longer lifespan than traditional tank models, often lasting 20 years or more with proper maintenance.

Q: Can I install an electric tankless water heater myself?
A: Installing an electric tankless water heater can be complex and may require upgrading your home’s electrical system. It is recommended to hire a professional for installation to ensure safety and proper functioning.