3/4" Electric Water Heater Tank Booster, NPT, 240V, 30 Amp, Single Phase, 0.3 GPM

Rheem RTEX-AB7 Electric Tank Booster – Inline Solution for Extended Hot Water Delivery

The Rheem RTEX-AB7 is an inline electric tank booster designed to supplement residential gas or electric storage water heaters. This unit is engineered to activate automatically during high-demand periods, providing additional hot water by boosting outlet temperature. It is suitable for installations requiring increased draw capacity without upgrading to a larger storage tank or switching to a tankless system.

Professional Application Overview

The RTEX-AB7 integrates with existing tank systems to address shortfalls in peak-hour hot water availability. It is compatible with 240V electrical systems and supports 30A single-phase service. With a 0.3 GPM activation threshold and up to 7.2 kW power draw, it is effective in increasing usable hot water volume, particularly in installations serving multiple fixtures or high-load appliances such as dishwashers and washing machines.

Key Performance Features

• Supplemental Heating Output: Delivers up to 7.2 kW to improve first-hour delivery and extend hot water supply
• Automatic Activation: Flow-activated design engages booster only during demand, optimizing energy use
• Compact Footprint: Surface-mountable unit installs directly to the outlet of the tank or on a nearby wall
• Efficient Retrofitting: Provides an upgrade path without replacing the entire water heater
• Rheem OEM Integration: Designed for compatibility with a broad range of Rheem tank models

Technical Specifications

• Voltage: 240V
• Amperage: 30 A
• Heating Capacity: 7.2 kW
• Activation Flow Rate: 0.3 GPM
• Connection Type: 3/4" NPT
• Mounting: Wall or tank-mount compatible

Installation Requirements

Installation should be performed by a licensed plumber or electrician familiar with 240V water heating systems. Hardwired electrical connections are required. The unit must be installed in line with the tank’s hot outlet and located in a dry, accessible area. Clearance for wiring and servicing should be maintained per Rheem installation guidelines. Confirm load capacity of the service panel before installation.

Professional Use Case

For Mechanical Contractors: The RTEX-AB7 is a useful solution for installations with spatial constraints or where existing tanks fall short during peak usage. It is also appropriate for use in retrofit scenarios where increasing capacity is needed without structural modifications. The booster can help meet performance goals for hot water availability without requiring a full system replacement.