








🔥 Compact power, endless comfort — heat smarter, live better!
The Rheem RTEX-18 is a 240V electric tankless water heater delivering 18 kW of high-efficiency heat with a maximum flow rate of 4.4 gallons per minute. Its compact design is 90% smaller than traditional tanks, enabling flexible wall-mount installation and significant space savings. Featuring self-modulating technology, it reduces energy consumption by up to 50%, providing endless hot water on demand for single or multiple point-of-use applications.











| Asin | B01MR7Z39V |
| Brand Name | Rheem |
| Capacity | 18 Gallons |
| Colour | Silver |
| Country Of Publication | USA |
| Customer Reviews | 4.2 4.2 out of 5 stars (2,096) 4.2 out of 5 stars |
| Flow Rate | 4.4 Gallons Per Minute |
| Global Trade Identification Number | 00020352685335 |
| Heat Output | 18 Kilowatts |
| Is Electric | Yes |
| Item Weight | 14.78 Pounds |
| Manufacturer | Rheem |
| Manufacturer Part Number | RTEX-18 |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Model Number | RTEX-18 |
| Mount Type | Wall |
| Power Source | Corded Electric |
| Special Features | Energy Efficient, Space Saving |
| Style Name | Indoor Installation |
| Unit Count | 1.0 Count |
| Upc | 020352685335 |
| Voltage | 240 Volts |
| Wattage | 18000 Watts |
User
Hot water on demand
Great product, have been using ours for 2 years and it works great.
User
Cost savings in a small box!
a 10+ year old rheem tank needed to be replaced. it wasn't broken but end of service life. and so much so if you drain it. after a lot of research I decided to go with tankless. fearful at first because hey is this truly better? the idea of having on demand seemed appealing. cost savings, of course. but then what type to get?!In the end I settled for a 18k rheem. ecosmart is also well reviewed, but supposedly this is just a rebranded rheem? (like dewalt and black/decker).It is super easy to install. it is small, frees up space, another bonus. costing half of a tank heater.if you can do it yourself... the installation cost is high, as you will have to run new electric and change some plumbing, but that is no biggy. you'll spend about $60 for a valve kit, $50 sharkbites and pex and some for the 8 gauge wire (that can add up if it is a long run btw). for this model you need 2x40amp breakersthe water is instantly hot, it easily serves 2 showers, one shower+dishwasher and laundry (tested!) I am very very impressed.also it feels cleaner as there is no water sitting in the tank (you should have seen the drain I had to do from the old tank to get it out of the way).highly recommend a tankless heater and this model works for our household.note: read about technical issues, so far all good, but will update if experienced.installation cost will add up if you can't do it yourself and requires logistics (between plumber and electrician).another installation note: when you get a valve kit with pressure relief (required by most code), it is effectively a gender changer. so when you get flexible hose (female), you need a M/M nipple to attach it to the valve kit... (that is another $20 for 2 nipples to take into consideration). That nipple needs to be taped on the valve attach side, the flex hose side has a o-ring and doesnt need tape (and don't add it either as it will leak)
User
Buen producto
Bastante cumplidor aun para lo que yo esperaba ya que solo requiero una cantidad relativamente baja de agua caliente y da bastante mas de lo esperado, totalmente recomendable
User
Buen producto
Es buen producto, solo la instalción se complica por el cableado electrico que debe ser calibre 8 y que los interruptores deben ser dobles por el tema de 220V. Por lo demas puedo comentar que el agua se calienta rapido, se mantiene a buena temperatura (ajustable),
User
Good
Good
Trustpilot
1 month ago
1 day ago