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Your cart is empty.The Rheem RTEX-08 kW Tankless Electric Water Heater is the perfect solution for those seeking instant hot water without the hassle of a bulky storage tank. This efficient and sustainable appliance delivers up to 1.95 gallons per minute (GPM) at 240 volts, providing plenty of hot water for your home’s needs while taking up minimal space. With its compact design, the RTEX-08 is easy to install and ideal for point-of-use applications, ensuring that you have reliable hot water just when you need it.
Patti Spurr
Reviewed in the United States on February 18, 2025
My husband installed this in his separate garage. Works great for cleaning up tools and hands. So much better than always having cold water in the garage. Easy to install.
Mayita
Reviewed in Mexico on February 18, 2025
Llegò bien y fácil su instalación.
Ana O
Reviewed in Mexico on February 14, 2025
El producto no es malo, cumplio su funcion al menos por los primeros 6 meses.Se le debe dar mantenimiento si o si, ya que la resistencia se cubre de sedimentos del agua.En el caso de que tu agua sea salitre, el mantenimiento es minimo cada 6 meses. El costo va desde 900 pesos si la resistencia se puede limpiar a 2700 pesos si la resistencia se debe cambiar.En mi caso especifico, solo hay un tecnico certificado por la marca , agendar con ese tecnico tomo más de una semana por su disponibilidad. Me arme de paciencia ya que para evitar perder la garantia todos los servicios se le dieron con el tecnico experto. La experiencia ha sido complicada, el calentador sirvio al 100 solo los primeros seis meses. De ahi todo es cuesta abajo… dificil de dar servicio, fallas constantes y alto costo de mantenimiento, hasta llegar a la descompostura total del equipo. El servicio de garantias de la marca en Mexico me rechaza la posibilidad de cambio, y que aunque en esta plataforma de compra dice que la tienda es Rheem, en realidad es un comercializador que esta en estados unidos y no cubre ninguna garantia.Conclusiones: no comprar este equipo si el agua de tu casa no es totalmente de manantial-no comprar este equipo si no eres electricista y plomero certificado- no comprar este equipo si no quieres perder dinero y tiempo.
Ethan Silvestri
Reviewed in the United States on February 13, 2025
You need low water pressure but i love this little thing
Deborah J.
Reviewed in the United States on February 12, 2025
i got this for a single small sink in the office with water temps around 65f in the winter and it heated the water to 120 easy with good flow.
FlaBW
Reviewed in the United States on January 16, 2025
I gave only 3 stars because the manufacturer failed to include steps to remove the cover and instructions for wiring the electrical side of things. No photos or even diagrams of wiring instructions. This was poor manual design. We spent considerable down time figuring out where the tiny 2 screws on the bottom were, that allowed access to the inside to connect the wiring. Eventually also found a YouTube video. This product manual needs to be rewritten. Otherwise the system works well. It's very sensitive as it detects hot water use quickly and heats up with reasonable time. We're in Florida and use only one pipe at a time for hot water. No issues so far.One was even connected behind a 10k solar inverter and it functioned well. With a few other things using power at the same time.
Frogdog
Reviewed in the United Arab Emirates on December 17, 2024
I fitted this in the kitchen to serve my kitchen sink rather than having a water tank heater. Unfortunately in the UAE water heating tanks are never installed with a water tray underneath so when they burst all the water pours into the ceiling. This unit works very well, however in the UAE you must just make sure that your electrical wiring can accommodate this type of unit. It draws a lot of electricity when it works so a thicker gauge wire is required.
ian
Reviewed in Canada on August 21, 2023
Our Small bunkie at our cottage was updated and we installed this unit to replace a old school 40 gallon tank. The old tank took up some valuable space which once removed allowed us to expand our shower. The new unit is so small. I had it installed by a electrician and I did the plumbing which was easy. We have one vanity sink and one shower in the bunkie. I was a bit concerned that it wouldn’t give is the water temp we wanted but it actually works perfectly.I bought this as a reconditioned unit from Amazon and saved some $, it was basically brand new in the box.
Linda R.
Reviewed in the United States on December 1, 2023
This is our third Rheem small electric water heater. It is for an outdoor shower and a garage sink. The first one BLEW UP just out of warranty! Amazon asked them to replace it for us and they did. The second one lasted 8 years. When it gave up we went to Amazon to replace it and they recommended this newer product.We bought it in Sept. 2023 and it stopped heating in late November 2023. When we finally were directed to the right people on the phone we were sent a15 page PDF and told to troubleshoot it ourselves and if the the Thermistors and Heating Elements were faulty they would send new parts and we would have to install them ourselves. The warranty on the heating element said 5 years but that do-it-yourself is NO Warranty at all! Three months! if they don't have people on the ground to work on them they should be refunded or replaced after such a short amount of time.
Avenue Shop Swap and Sell
Reviewed in Canada on February 2, 2022
Installation was easy. It's only been up and running for about 2 weeks, but so far it's working great.
T. Parry
Reviewed in the United States on December 7, 2020
Great little water heater. I'm using it for a small studio apt. It's powering a shower, bathroom sink, and a kitchen sink. Word of warning: We thought there was a ghost in the wall because it would heat the water perfectly until the shower came on. Then it went to nothing. We did a ton of problem solving on this unit and were about to bust down the wall to make sure the shower was piped properly. Turned out that turning the output valve down to about half fixed all of our problems. You can either use a flow limiter OR just turn the output valve down.Note: the 8w unit is BARELY enough to keep the shower going. It works, but can not heat water for anything else at the same time as the shower. If you can go for the slightly larger unit, I would highly suggest if you're doing much more than just powering a sink. I would have in retrospect, but would have to re-do the electric.
James R. Herman
Reviewed in the United States on January 11, 2020
I got this to replace my RTE 9 that has been working fine for over 6 years since I installed it back on 11-1-2013 when I got rid of my propane tank. So I decided to just have this new water heater on hand whenever the RTE 9 quits working. Well the RTE-9 quit working on 6-16-2020. So it lasted 6 years and 7 months. So, I installed the RTEX-08. I quit working on 12-4-2023. So, it lasted 3 years, 5 months and 12 days. I bought a replacement RTEX-08 and will got it on Wed, 12-6-2023. So I downgraded my rating to 4 stars. I also left a message with tech support. Perhaps some internal part could be replaced, but I'm not holding my breath. I'm not unhappy with performance, just thought it would last longer than 3.5 years.,So I got rid of my propane water heater shown in the first photo. In the second photo the green double breaker in the upper right is a 30 amp 240 volt breaker for the electric dryer plug. I don't have an electric dryer so I removed this breaker and just tied it out of the way. I replaced it with a 240 volt 40 amp breaker in order to run the tankless hot water heater. There was a knockout in the upper right. The water closet is right behind this electric panel. There is only a sheet of drywall behind the electric panel. Only three wires to connect. Two wires to the breaker and a bare copper ground wire to the panel on the right. So the three feet of electric wire already attached to the water heater itself is all that I needed.The third photo shows the RTE 9 connected. I used SharkBite push to connect plumbing connectors. The work with both PEX and copper. I adjust the water temp all the way up in the winter when I'm taking a shower. Otherwise I have the temp dialed back a little. So I only run my hot water faucet almost all of the time without running both hot and cold at the same time. I live in a 14 foot by 52 foot singlewide by myself so this is a whole house water heater for me. I am really pleased. Consumer Reports said that tankless hot water heaters can clog but after more than 6 years I'm pleased with how this tankless water heater is working for me. Once it passed the 6 years mark I decided to just get another one and have it ready to go when the time inevitably comes and the old one quits working.
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