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Rheem RTEX-AB7 7.2 kW Electric Water Heater Tank Booster with Direct Tank Attachment

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  • Rheem RTEX-AB7 7.2 kW Electric Water Heater Tank Booster with Direct Tank Attachment
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Product Overview


The RTEX-AB7 is a water heater tank booster from Rheem. This unit can be attached to an electric or gas tank and provide an additional boost to the tanks hot water output. This unit can attach directly to your tank and provide you with up to 45% more hot water.
  • Adds up to 45% capacity to water heater tanks
  • Can give a 50 gallon tank the hot water output of an 80 gallon tank without taking up more space or upgrading your tank
  • More hot water, no more cold showers
  • Save Space
  • Save Energy
  • Save Money
  • Robust copper immersion heating element
  • Can be installed on both a gas and electric water tank
  • Advanced turn on and water temperature settings allow you to get the most out of your existing tank heater
  • When installed with an electric tank, no additional wiring or circuit breaker is required, the unit can be wired on the same circuit allowing it to turn your tank off and turn itself on to boost your hot water.
Compliance and Restrictions
warning: Cancer and Birth Defect/Reproductive Harm --


Amperage: 30
Kilowatts: 7.2
Voltage: 240
Water Connection: 3/4 in. NPT Fitting



5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Easy way to add capacity
This arrived super fast! The instructions were clear and complete so I could know exactly what fittings I needed for my setup - only about another $10 for fittings from the local store.
Installation took me 90 minutes start to finish, including cutting my existing rigid pipe and connecting in with a sharkbite.
It worked as advertised, so even with family visiting for the holiday no one had a cold shower! I especially like the eco mode so I can program my water heater like I program my heat and AC.
May 30, 2018
Does what it says
Installation was easy. Only complaint would be the location of the wiring and the plastic-y feeling of the unit. Works as it should - I'm happy
February 26, 2018

Questions & Answers

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How do i open the cover?
A shopper on Nov 20, 2018
BEST ANSWER: Your question will be best answered by the manufacturer, who can provide you with the accurate information. The number to reach the technician is 1-866-720-2076.
we have a long 3 story run with a subsequent long delay and water waste when showering upstairs. Which of your systems could we install( New construction addition) to provide warm water immediately until the warm water arrives from below?
A shopper on Oct 28, 2017