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Availability:
In Stock.
Arrives
Sunday, Mar 1
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Features
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Most advanced self-modulation, adjust power to meet hot water demand
- Durable Copper immersion three heating elements, field Serviceable
- Simple installation bottom 3/4 inch NPT water connections
- Threaded for easy replacement, simple installation, digital temperature display
Description
Professional classic tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications
Brand: Rheem
Power Source: ac_dc
Product Dimensions: 1"W x 1"H
Color: Gray
Wattage: 27000 watts
Brand: Rheem
Product Dimensions: 1"W x 1"H
Color: Gray
Wattage: 27000 watts
Voltage: 240 Volts
Maximum Flow Rate: 0.11 Gallons Per Minute
Efficiency: High
Mounting Type: Wall
Is Electric: Yes
Manufacturer: Rheem
Item Depth: 3.50 inches
UPC: 020352685342
Global Trade Identification Number: 42
Part Number: RTEX-27
Item Weight: 17.8 pounds
Item model number: RTEX-27
Is Discontinued By Manufacturer: No
Item Package Quantity: 1
Included Components: Rheem RTEX-27 Residential Tankless Water Heater
Batteries Included?: No
Batteries Required?: No
Date First Available: January 19, 2017
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Mar 1
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I did need to install another 240V circuit to accommodate this tankless hot water heater, but my circuit-breaker box had the extra capacity, so it was simple to have done, and now, having an unlimited supply of hot water for as long as I want it is more than just convenient. No more long showers cut short by suddenly cold water! No more waiting after (or before) a shower or load of laundry for a whole tankful of water to get hot enough! No more planning out major hot-water use to avoid running out! As far as I can tell, the temperature control is accurate and dependable; I changed the setting to a few degrees higher than the installer left it, and I noticed the difference immediately. I can't imagine household use requiring a degree-by-degree control of the water temperature, but since the control is digital, why not take advantage of the capability? It's so much clearer than some "hot" "medium-hot" "medium" labels that leave everyone guessing, anyway. I bought this unit here because the price was relatively low and I could have the unit delivered to my door, instead of having to drive a 55-miles round trip for a more limited selection. I bought the unit with one level more capacity than I actually needed because the extra expense would disappear over the long life of the unit and I'd be certain never to run out of hot water. I bought the Rheem because of the brand's reputation. As for the "nay-sayers," I and some of my friends who inquired about tankless heaters were told tales of low groundwater temperatures and other things that (1) turned out not to be true and (2) didn't agree with the manufacturer's (and other professionals') information. I do not live where it gets very, very cold in winter, but neither does the plumbing contractor who advised me against this kind of heater; either he's ignorant, makes a lot more profit when he installs a hot water tank, or he's unwilling to learn about electric circuitry in 21st-century homes. If you live where winters are really long and cold, do your research and learn what you need to know, sure, but don't let misinformation keep you from having state-of-the-art hot water.
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Reviewed in the United States on June 11, 2020 by D_Spider
My old 80 gallon hot water tank was on it's way out so I did research on a replacement. I could replace the tank with another 80 gallon hot water heater (no thanks), I could go with a hybrid 80 gallon hot water heater (not bad), or I could go with a tankless system (ideal). There are pros and cons to each but I ended up choosing the Rheem 27kw tankless hot water heater. I read good and bad reviews on this system but I have nothing but great things to say. I had to have an electrician come and install an additional (2) 40 amp breakers and 8/2 wire for around $450 so I had a total of 3 lines hooked up to the system (essentially 1 line/breaker for each heating element). At first I was getting only luke warm water so I called Rheem tech support and the advisor was extremely helpful and told me to check a few things. Within 10 minutes it was working perfectly. (The issue had to do with the install, not the product). Be sure you're getting 240V to each element before your electrican leaves. Nevertheless, we initially set the temp to 140 and was way too hot. We dialed it down to 125 and it is perfect. We have 4 full bathrooms, kitchen, laundry, etc. We can easily have 3 showers on simultaneously. Best part is the hot water never runs out and ultimately saves you money. 2 thumbs up!
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Reviewed in the United States on April 30, 2019 by Doug Doug
Was delivered fast. Pretty good water heater
Reviewed in the United States on September 2, 2025 by Robyn
It’s great for a small home, I can shower and wash a load of clothes at the same time.
Reviewed in the United States on September 6, 2025 by PHIL SAADEY
This hot water heater is trash! We have this professionally installed and had problems with it right out of the gate. It pulls so much energy that it bogs the lights down to our entire home every time it comes on. And now less than a year later, it doesn’t come on at all. We have no hot water!
Reviewed in the United States on February 8, 2025 by Hillary M Hyslope
We love how this works, keeps us in plenty of hot water throughout the home. Delivery was late, supposed to be 2 days and finally got it on the fourth day.
Reviewed in the United States on June 2, 2024 by Tim Hanus
I replaced a tankless hot water heater, which cracked due unusually low freezing weather with this Rheem unit. The previous unit had significant variability in temperature. I bought the 27KW unit which is more than I needed for the house to be sure that I had adequate capacity. I am pleased with the steady temperature control and easy setting on the temperature with an LED display. While I used a licensed plumber to install the unit, it was a simple installation. I added a water filter because the water is very hard here. Amazon showed a complete kit for the heater, filter, and cut-off valves, with ports for easy draining and flushing. This will resolve concerns with hard water accumulation on the heating elements with the filter and regular flushing. The heating elements are replaceable, if needed. This unit is much more versatile than my old unit. Very pleased.
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Reviewed in the United States on May 8, 2021 by RNLee
A lot of very hot water for all our uses
Reviewed in the United States on January 26, 2024 by Chuck Hobart