Rheem RTEX-24 Tankless Electric Water Heater

The RTEX-24 is a high-capacity unit designed to provide hot water for multiple applications simultaneously. However, its ability to supply an entire home depends on your local groundwater temperature and your household's peak demand; in colder climates, it may be better suited for specific zones or smaller homes.

This is a 24kW unit that requires a 240V electrical connection. Because of its high power draw, you will need to ensure your home's electrical panel can support the necessary amperage and that you have the correct gauge wiring installed by a qualified professional.

The unit features an external digital display that allows you to adjust the water temperature precisely between 80°F and 140°F. You can easily monitor and change the settings with a simple touch, ensuring the water is exactly as hot as you need it.

Like most tankless heaters, the RTEX-24 is relatively low-maintenance, but it is not maintenance-free. Depending on the hardness of your water, you may need to flush the system periodically to prevent mineral buildup on the copper heating elements, which helps maintain efficiency and longevity.

While the unit is designed for simplified installation with bottom connections, it involves significant electrical work that typically requires a licensed electrician. Unless you have advanced experience with high-voltage wiring and plumbing, professional installation is strongly recommended to ensure safety and warranty compliance.

The RTEX-24 has a maximum flow rate of 5.9 gallons per minute (GPM). Keep in mind that the actual flow rate you experience will vary based on the temperature rise required; if you need to heat very cold incoming water to a high temperature, the flow rate will decrease.