Electric tankless water heaters are compact units that heat water on demand and eliminate the need for large storage tanks. They save space, are especially energy-efficient, and reduce the risk of water damage. Read all about the best uses for electric tankless water heaters in our guide below.
How Electric Tankless Water Heaters Work
Electric tankless water heaters provide hot water instantly by heating it as it flows through the unit. This on-demand system offers several advantages over traditional tank-style water heaters.
The Heating Process
When you open a hot water tap, cold water enters the unit and passes through a series of electric heating elements. These elements rapidly heat the water to the temperature you want before the water exits the unit. The process happens almost instantaneously and provides a continuous supply of hot water.
Energy Efficiency
Electric tankless water heaters are especially energy efficient. They only use energy when you need hot water, which results in significant savings.
Space-Saving Design
Electric tankless water heaters are compact and you can mount them to walls, which frees up valuable floor space. This makes them especially ideal for smaller homes or apartments.
Factors To Consider When Choosing an Electric Tankless Water Heater
Consider the factors below before you invest in an electric tankless water heater.
Available Power Supply
Electric tankless water heaters require a significant amount of power to operate effectively. A whole-house unit may need up to 120 amps, which can be challenging for homes that have limited electrical capacities. You must assess your home’s electrical system before you install this type of unit.
Temperature Rise
Temperature rise refers to the difference between the incoming groundwater’s temperature and the desired hot water’s temperature. A unit must use more energy in colder climates that feature lower groundwater temperatures.
Flow Rate Requirements
The flow rate, which is measured in gallons per minute, determines how much hot water a unit can provide to different destinations simultaneously. Consider how much water your household uses, and determine whether the unit you choose can meet those needs.
Best Applications for Electric Tankless Water Heaters
Electric tankless water heaters are not suitable for every situation, but they are ideal for some of the uses below.
Point-of-Use Installation
Electric tankless water heaters are suitable for point-of-use applications, such as those below.
- Kitchen sinks
- Outdoor showers
- Remote bathrooms
- Workshops or garages
Supplemental Hot Water Source
Electric tankless water heaters can act as supplemental hot water sources in homes that have high hot water demand. It can provide hot water to specific areas of the house, which reduces the load on the main water heater.
Small Homes or Apartments
You can use a compact electric tankless water heater to heat small houses, or the spaces below.
- Guest houses
- In-law suites
- Studio apartments
- Tiny homes
Advantages of Electric Tankless Water Heaters
Electric tankless water heaters offer several benefits for homeowners, including those below.
Energy Savings
Electric tankless water heaters can significantly reduce energy consumption by heating water only when you need it. This can lead to lower utility bills than those you’d get with traditional tank-style heaters.
Endless Hot Water Supply
You can enjoy a continuous supply of hot water without the risk of water running out. This is particularly beneficial for large households that have high hot water demand.
Longevity
Electric tankless water heaters typically have longer lifespans than traditional tank-style heaters. They can last up to 20 years or more if you maintain them well.
Reduced Risk of Water Damage
Using an electric tankless water heater reduces the risk of leaks and water damage since there’s no large tank of stored water.
Potential Drawbacks of Electric Tankless Water Heaters
There are some potential drawbacks associated with using electric tankless water heaters, including those below.
High Initial Cost
The cost of purchasing and installing an electric tankless water heater upfront is usually higher than the cost of a traditional tank-style heater. However, the long-term energy savings can offset this initial investment.
Electrical System Upgrades
Many homes require electrical system upgrades to accommodate the high power demands of electric tankless water heaters. This can add to the overall installation cost.
Limited Flow Rate in Colder Climates
Electric tankless water heaters may struggle to provide sufficient flow rates for whole-house applications in regions that have colder groundwater temperatures.
Tankless Water Heater Installation Considerations
You must properly install an electric tankless water heater to reap its benefits. Keep the variables below in mind:
Professional Assessment
Have a licensed electrician assess your home’s electrical system before you install your heater to make sure your household can handle the unit’s power requirements. You may have to upgrade your electrical panel or add dedicated circuits.
Proper Sizing
You must choose the right size unit to properly heat your household’s water. Consider factors such as expected output temperature, the existing water temperature, and the number of fixtures and appliances you have.
Location
Install the unit close to the point of use to minimize heat loss through pipes. Make sure there’s adequate ventilation, and that you can easily access the unit for maintenance.
Maintenance Tips for Your Electric Tankless Water Heater
Follow the maintenance tips below to keep your electric tankless water heater running efficiently.
- Check and clean the inlet filter regularly.
- Flush the system annually to remove mineral buildup.
- Inspect electrical connections periodically.
- Schedule professional maintenance as recommended by the manufacturer.
- Test the pressure relief valve annually.
