Rheem RTEX-AB7 Water Heater Booster

Delivers up to 45% more hot water
Improves gallon capacity and performance of standard tanks
Compatible with both gas and electric tanks
Easy installation on new or existing water heater

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$455 & Shipping is FREE

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Certified Rheem© warranty facility

2-Year Parts & Labor Warranty

SAME DAY SHIPPING if you order by 11:00 AM

Why You Should Buy a Water Heater Booster

How to Install a Rheem RTEX-AB7

Check out the benefits of the Rheem RTEX-AB7 Water Heater Booster:

The Rheem Water Heater Booster works with your tank to provide hot water past the tank’s capacity.

You can heat the same amount of water as an 80 gallon unit with a 55 gallon water heater when you add a Rheem RTEX AB7 water heater booster.
Take long, hot showers to your heart’s desire. Installs directly on the water line to provide more hot water than the tank alone can provide.
No problem running several showers and appliances that use hot water at the same time.
Use the same space you already have for your 80 gallon water heater.
Save money! Purchasing a 55 gallon water heater and adding a water heater booster is a lot less expensive than buying a light-duty 80 gallon commercial water heater for residential use.
The unit senses the temperature of the water from the tank outlet, and activates when it senses that its inlet temperature has dropped below the user set activation temperature.
Miami Water Heater is a Rheem warranty shop. This means in the unlikely event that something goes wrong with your water heater booster, you can send it back to us for warranty work; no having to deal with the manufacturer.

Product Attributes

Increase hot water delivery up to 45%
Compact design
Digital user interface
Adjustable activation temperature 80-130°F
Adjustable outlet temperature 80 - 140°F
Set temperature in increments of 1°F
Attaches to any tank or nearby wall
Field replaceable element

Additional wiring maybe required for a gas tank installation.

Specifications

Voltage: 240
KW: 7.2
Max Amps: 30
Water Connections: 3/4" NPT Fittings
Breaker: 1 X 30 AMP Double Pole
Install Location: Indoor
Primary Warranty: 5 Yrs
Water Savings Setting Included: Yes

Dimensions

Product Depth (in.) 3.63"
Product Height (in.) 8.25"
Product Width (in.) 12.63"
Weight: 5.64 LBS

What Our Clients Are Saying

It’s not just about the water heater, it’s also about the company you are buying it from.
Miami Water Heater has been selling, installing, maintaining and repairing water heaters for over 70 Years

Clay H.

“I get crazy hot water to the hand sink in about 15 seconds, and it just runs and runs. I’m so impressed by it, that I’m buying another one for my office.”

Charlie V.

“George and the guys there were very nice, organized, timely and good prices too.”

Butch

“WOW this was the best move I’ve made in years. Space saver, takes care of 3bd 2.5 bath two story townhouse with 4 ppl in house.”

Fernando C.

“Great service and prices. They truly delivered as promised. They have a client for life.”

Marlene T.

“It’s in the basement but does a great job of heating the water that we use for showers, dishwasher etc. it gets hot and stays hot! Great product.”

Carlos H.

“Miami water heater was exceptional from the beginning to end. The owner Carlos is top notch and very professional.Glad I found them would recommend to anyone.”

What is a water heater booster and how does it work?

A water heater booster, such as the Rheem RTEX-AB7, is a compact device installed directly on the hot water line or over an existing water heater. It boosts your tank’s capacity, pressure, and efficiency—helping your household enjoy longer, uninterrupted hot showers and better water performance. Whether you have a gas or electric water heater, a booster increases output without requiring a larger tank.

How do I know if I need water heater booster?

If your home has a standard 40- or 50-gallon water heater, it can quickly run out of hot water—especially during back-to-back showers or when multiple appliances run at once. The Rheem RTEX-AB7 water heater booster solves this by extending your system’s hot water supply. It’s a perfect solution for large families, frequent guests, or anyone tired of running out of hot water mid-shower.

How easy is it to install a Rheem RTEX-AB7 booster?

Installation is straightforward and typically quicker than a full water heater replacement. However, it’s best to have a licensed professional handle the setup to ensure safe operation and compatibility with your existing system. The Miami Water Heater team specializes in installing, maintaining, and replacing all types of water heaters and boosters across South Florida.

What are the benefits of installing a water heater booster?

By improving your water heater’s efficiency, the RTEX-AB7 helps reduce energy waste and water usage. You get the benefit of a higher-capacity system without upgrading to a larger tank, making it an affordable and eco-friendly way to boost performance and comfort in your home.

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