Rheem RTEX-24 24kW Electric Tankless Water Heater — 240V, Compact & Efficient

On-Demand Hot Water, When You Need It

Introducing the Rheem RTEX-24, a 24 kW electric tankless water heater designed to deliver hot water on demand with a robust flow rate of up to 5.9 GPM. This compact unit is ideal for single point-of-use needs or whole-home configurations where space is at a premium, such as under sinks, in closet spaces, or in small utility rooms.

The unit heats water only as it passes through, reducing standby heat and helping to keep energy use lean. The RTEX-24 is up to 93% smaller than traditional electric storage heaters and does not require venting, which makes retrofit easier in tight installations.

In regions with varying groundwater temperatures, performance will depend on the temperature rise you want and your actual water usage. The performance guide provides regional expectations to help you plan.

Key Specifications and Setup

• Electrical requirements: 3 x 40 A double-pole breakers; 200 A service recommended; confirm your panel has space for this unit. RTEX-24 is rated at 24 kW, 240 V, and draws about 100 A under typical conditions.
• Flow and capacity: Up to 5.9 GPM, supporting multiple outlets in suitable setups; actual output depends on groundwater temperature and demand.
• Compact, scalable design: Fits into tight spaces and can be integrated where hot water is most needed, without venting or bulky tanks.

Control at Your Fingertips

• On/off dial with adjustable digital temperature display, allowing precise settings in 1-degree increments from 80 to 140 F.
• Quiet operation is typical for electric tankless units, with fast response to changes in hot water demand, helping you feel in control of your comfort.

Consider the RTEX-24 for a point-of-use installation near a sink or shower, or as part of a larger home setup where a compact solution can reduce piping runs and save space. While it can meet varied needs, outcomes depend on climate, supply water temperature, and how you use hot water in your home. Review the performance guide and consult a licensed professional to assess your electrical capacity and space requirements before installation.