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Brand: Rheem

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray

795 ratings

Price:

$425.79 & FREE Returns

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Style: Heater

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Brand	Rheem
Color	Gray
Style	Heater
Power Source	Battery Powered
Item Dimensions LxWxH	18.25 x 3.5 x 14.5 inches

About this item

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External digital thermostatic control with LED display (+/1 degree accuracy)
Most advanced self-modulation, adjust power to meet hot water demand
Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
Simple installation – bottom 3/4 inch NPT water connections
Threaded for easy replacement, simple installation, digital temperature display

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All Product Information Customer Q&A's Customer Reviews

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Customer Rating	(795)	(369)	(3244)	(3815)	(739)	(1022)
Price	$425.79	$582.59	$200.67	$344.14	$255.00	$621.75
Shipping	FREE Shipping. Details	FREE Shipping. Details	FREE Shipping. Details	FREE Shipping. Details	FREE Shipping. Details	FREE Shipping. Details
Sold By	Amazon.com	Amazon.com	Amazon.com	Amazon.com	CARESAN	Amazon.com
Item Dimensions	18.25 x 3.5 x 14.5 inches	18.25 x 3.5 x 17.63 inches	3.75 x 8 x 11.5 inches	3.63 x 14 x 17 inches	12.63 x 8.25 x 3.63 inches	4.63 x 16.63 x 14.5 inches

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Product description

Style:Heater

This water heater offers quick, continuous hot water that is on demand for single point-of-use or multiple applications.Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement. Digital temperature control allows you to set your temperature in increments of 1°

Product information

Style:Heater

Technical Details

Manufacturer

‎Rheem

Part Number

‎RTEX-18

Item Weight

‎14.8 pounds

Product Dimensions

‎18.25 x 3.5 x 14.5 inches

Country of Origin

‎China

Item model number

‎RTEX-18

Is Discontinued By Manufacturer

‎No

Size

‎Small

Color

‎Gray

Style

‎Heater

Material

‎Alloy Steel

Shape

‎Rectangle

Power Source

‎Battery Powered

Voltage

‎240 Volts

Wattage

‎18000 watts

Installation Method

‎Wall Mount

Item Package Quantity

‎1

Water Consumption

‎7 Gallons

Maximum Pressure

‎150 Pound per Square Inch

Usage

‎Inside; Professional

Included Components

‎Fittings, Aerators

Batteries Included?

‎No

Batteries Required?

‎No

Additional Information

ASIN

B01MR7Z39V

Customer Reviews

795 ratings

4.5 out of 5 stars

Best Sellers Rank

#28,395 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#18 in Water Heaters

Date First Available

January 19, 2017

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]

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Product guides and documents

User Manual (PDF)

Specification Sheet (PDF)

Important information

Wattage

18000 watts

Bulb Voltage

240 volts

Customer Questions & Answers

See questions and answers

Customer reviews

5 star		76%
4 star		12%
3 star		5%
2 star		2%
1 star		6%

How are ratings calculated?

Top reviews from the United States

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Grant Miller

Greatest water heater!

Reviewed in the United States on April 5, 2018

Style: HeaterVerified Purchase

I am so impressed with this water heater!! No clicking relays, just totally silent. Simply hot water at your choice of volume. You choose the temp setting and it takes it from there! We (two of us) have a dishwasher, kitchen sink, laundry sink, bathroom sink, and bathtub, all depending on this little guy, and we never have a shortage! The set temperature lights up when you open the valve somewhere. One thing I will tell you, because a bathtub faucet has no restriction like the sinks or even the shower head, the water flows through this heater faster than it can get the water up to your set temperature (I have it set at 130). I remedied this by turning the hot water valve partway off at the bathtub. This restricts the flow into the bathtub JUST enough to allow the heater to keep up, yet is not slow so as to be inconvenient.

172 people found this helpful

Helpful

C. Wood

Read this if you're having problems getting it to operate!

Reviewed in the United States on March 20, 2018

Style: HeaterVerified Purchase

The unit works as described...NOW...BUT, apparently, there is some mistake with the mounting/wiring diagram that comes with the unit.
After several weeks of back and forth with Rheem, an electrician, a plumber and a contractor trying to figure out why it wasn't working, the electrician (2nd service trip) was reviewing the installed unit with Rheem customer service tech and discovered that the directions have the diagram upside down from how the unit actually was. I don't know what the conversations was after the finding...but the unit works now! Hope this save someone else the aggravation and stress we went through trying to make it work!

172 people found this helpful

Helpful

Darrell G.

Works great for 2,500 sq ft home.

Reviewed in the United States on January 12, 2020

Style: HeaterVerified Purchase

The media could not be loaded.

Very good unit. I can feel the Hot Water in about 1-2 minutes in the farthest bathroom. Great unit for a 2,500 sq ft 4 BDRM 3 BTRM House. When installing be sure to use suggested 8 AWG wire for dual 40 Amp Circuit Breakers. Also make sure to vent/open all of the faucets before powering on the unit. If not you can get a error code on the unit. Lastly the unit will only come on when you use the Hot Water, thus the savings $ on electricity, and the LED sceen that shows the temperature will only come on then. Very satisfied.

63 people found this helpful

Helpful

mia Nelson

DOESNT WORK, INTERNAL PART FAILURE

Reviewed in the United States on January 20, 2019

Style: HeaterVerified Purchase

Didnt work. According to the manual, it's an internal part failure. According to the internet, this is a common problem. So just to clarify, we have now taken out our old water heater, rewired the house to fit the new water heater, rerun the plumbing to accommodate the new water heater, rebuilt the wall to accommodate the new water heater and hook it all up and the part that makes the water hot does not work. Well, I had that without a water heater. Granted, I returned the defective item, got a refund and ordered a different brand within a day but it has now been 6 days without hot water in our home. Fortunately for us my mother lives next door but, definitely think about what you are going to do if you get a defective item before you order this. Oh, I almost forgot, the phone number I called, the one given on amazon, i left a message since they have bank hours and none called me back, to this day.

73 people found this helpful

Helpful

Sharon Swavel

Make sure to check your total service coming in to the property!

Reviewed in the United States on December 7, 2018

Style: HeaterVerified Purchase

This water heater works really well. Our only problem with this is when we turn the hot water faucet on our lights flicker throughout the bathroom and kitchen. The problem is because there is only 100 amp service coming into our house and the water requires 80 amps when in use. I wish now we would have installed a gas water heater. Don't buy this if there is 100 or less amps electric service coming in to your home!!

57 people found this helpful

Helpful

Amazon Customer

The perfect hot water heater is hard to find!

Reviewed in the United States on April 23, 2019

Style: HeaterVerified Purchase

If you're using this type of water heater be prepared to do some research and make changes. One size does not fit all water needs. This was our third attempt to accomplish hot water for a studio apartment. Read alot of reviews, returned 2 other water heaters after they failed to provide what their boxes claimed. Lots of time on the phone with tech support only to find out even though their products advertise good solid results based on our region, it was a no go. This product shined above the rest! Easy enough to install (required electrical/plumbing adjusts) and we had to adjust the overall water pressure coming in but it finally worked itself into a great flow of continuous hot water. It's kind of a science and a process but we made it work. Good luck in your quest for the perfect combination of heat and water. Hope this saves you time and effort!

44 people found this helpful

Helpful

Mike

Can't Handle The Flow

Reviewed in the United States on October 4, 2019

Style: HeaterVerified Purchase

This unit was a disappointment. Although it has 3/4" inlet and outlet, it cannot keep up with just my washing machine attached. I get an E5 error meaning the flow is too high. Not sure why you would build a unit that allows the flow to be too high. I can't imagine what it will do once I hook up the bathroom...

My temporary solution is to restrict the flow to the washing machine, but if I get an error with just one thing using it I'm not optimistic about adding a sink and bathtub.

My semi-permanent solution is to turn down the temp on the unit. This is in line with my main water heater and is used to boost the temp because the main unit is so far away. That works for me but may not work for others.

Rheem - why would you design a unit that can't handle the flow?

26 people found this helpful

Helpful

Stacey Hughes

So excited about this product!!!

Reviewed in the United States on October 14, 2017

Style: HeaterVerified Purchase

I am super impressed with this product. We had always had the traditional water heater and when it went out we decided to try. So glad I did. My electric bill has gone down and I have hot water when and where I want and how much I want at anytime.

55 people found this helpful

Helpful

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Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray

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