Why Electric Tankless Water Heaters Are Not Ideal for Whole-Home Use

Electric tankless water heaters are often praised for energy efficiency and space-saving design, but they are usually not the best choice for whole-home applications. Here’s what homeowners need to know about the potential problems with using electric tankless units to supply an entire house.

High Electrical Demand

Whole-home electric tankless water heaters require large amounts of electricity to heat water on demand. Most homes are not equipped with the necessary high-amperage circuits, and upgrading your electrical system can be expensive and disruptive.

Limited Flow Rate

Electric tankless systems have a restricted flow rate, which can result in inconsistent hot water when multiple showers or appliances are in use at the same time. Homes with high simultaneous water demand often experience cooler water or reduced pressure.

Higher Operating Costs

Running a whole-home electric unit can lead to significantly higher electricity bills, especially in regions with high energy prices. Gas-powered tankless water heaters are usually more cost-effective for supplying an entire home.

Cold Water Sandwich

Electric tankless water heaters can produce brief bursts of cold water when switching fixtures, known as the “cold water sandwich” effect. This problem is more noticeable in whole-home setups due to higher water demand.

Frequent Maintenance

Hard water can cause mineral buildup in electric heating elements, reducing efficiency and requiring regular maintenance. Whole-home systems see more water flow, so maintenance can be more frequent and costly compared to smaller units.

Better Options for Whole-Home Hot Water

For reliable hot water throughout the house, homeowners should consider:

• Gas-powered tankless water heaters – Handle multiple fixtures better and provide steady hot water.
• High-capacity tank systems – Lower electrical demand and simpler maintenance.

Conclusion

Electric tankless water heaters work well for single bathrooms or sinks, but they are not recommended for whole-home use. Homeowners looking for consistent, high-volume hot water should explore gas tankless or traditional tank systems.

Schedule a consultation with us today to assess your home’s water usage and electrical system before installing a whole-home electric tankless water heater.