The Rheem RTEX 13 is a compact, energy-efficient electric tankless water heater designed for instant hot water on demand. With a flow rate of up to 3.17 gallons per minute, it’s ideal for small homes, studio apartments, or RVs. It heats water only when you open the tap—no storage tank, no standby energy loss, and no waiting for hot water.

When you turn on the faucet, cold water flows through the unit and activates self-modulating copper immersion heating elements. These elements heat the water instantly, delivering a continuous and consistent hot water supply. The system shuts off automatically when you close the tap, saving energy and water with every use.

Extremely efficient. The Rheem RTEX 13 electric tankless water heater has an energy efficiency rating of 99.8%. According to the U.S. Department of Energy, switching to a tankless model can save up to 26% on energy costs—and many homeowners report savings as high as 30% on electricity bills.

Tankless systems offer greater energy efficiency, space savings, and long-term reliability. With the cost of energy on the rise, an electric tankless water heater like the RTEX 13 provides a smart and sustainable way to enjoy hot water instantly—without the waste or high utility bills associated with traditional tanks.

If you’re looking for a dependable and energy-efficient hot water solution, Miami Water Heater can help you install the Rheem RTEX 13 electric tankless water heater and ensure optimal performance for years to come.