Review
Read article Rheem RTEX-24 Reviews: What Real Owners Actually Say
A roundup of real Rheem RTEX-24 owner reviews, covering what works, what fails, and the pattern behind successful installations.
Your expert Rheem RTEX-24 guide.
The complete guide to the Rheem RTEX-24 tankless water heater.
RTEX24 is your comprehensive, independent resource for the Rheem RTEX-24 electric tankless water heater. We cover everything from initial sizing and installation to error codes and maintenance.
Latest Guides & Troubleshooting
Independent, expert-reviewed articles to help you install, maintain, and fix your Rheem tankless water heater.
Buying Guide
Read article Rheem RTEX-24 Tax Credits: What's Available in 2026
Find out what tax credits and rebates actually apply to the Rheem RTEX-24 in 2026, now that federal equipment credits have sunset.
Maintenance
Read article Do You Need a Water Softener With the RTEX-24?
Find out if a water softener can extend your Rheem RTEX-24's lifespan, based on real verified owner experiences with hard water damage.
Maintenance
Read article Rheem RTEX-24 Replacement Parts Guide
A complete guide to the most commonly replaced Rheem RTEX-24 parts, including heating elements, sensors, and where to buy them.
Maintenance
Read article Best Water Filters for the Rheem RTEX-24
Find out if an inline water filter can help your Rheem RTEX-24 last longer, and what type of filter actually makes sense for your water.
Guides
Read article How Long Does the Rheem RTEX-24 Last?
Find out what really determines how long a Rheem RTEX-24 lasts, based on real verified owner experiences ranging from years to early failures.
Frequently Asked Questions
01What is the Rheem RTEX-24?
The Rheem RTEX-24 is a 24kW electric tankless water heater designed to provide continuous hot water for small to medium-sized homes.
02What are the electrical requirements for the RTEX-24?
It requires a 240V connection, three 40-amp double-pole breakers, and three runs of 8 AWG copper wiring.
03Can I install the Rheem RTEX-24 myself?
While DIY installation is possible, it is highly recommended to hire a licensed electrician and plumber to ensure warranty coverage and safety.
04What does a blinking light or error code mean?
Blinking lights or code displays indicate specific issues like low water flow, heating element failure, or electrical issues. Refer to our error codes guide for details.
05How often should I descale the RTEX-24?
It should be descaled once a year (or every 6 months in hard water areas) using a flushing kit with food-grade vinegar.