Brand | Rheem |
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Product Dimensions | 14.5"W x 18.25"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 18000 watts |
Voltage | 240 Volts |
Maximum Flow Rate | 4.4 Gallons Per Minute |
Heat Output | 18 Kilowatts |
Style | Heater |
Maximum Operating Pressure | 150 |
Manufacturer | Rheem |
Part Number | RTEX-18 |
Item Weight | 14.78 pounds |
Country of Origin | China |
Item model number | RTEX-18 |
Is Discontinued By Manufacturer | No |
Size | Small |
Finish | Stainless Steel |
Shape | Rectangle |
Installation Method | Wall Mount |
Item Package Quantity | 1 |
Water Consumption | 7 Gallons |
Special Features | LED Display |
Usage | Inside; Professional |
Included Components | Fittings, Aerators |
Batteries Included? | No |
Batteries Required? | No |
To see product details, add this item to your cart.
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Ships from: Amazon.com Sold by: Amazon.com
To see product details, add this item to your cart.
FREE Returns
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns. How to return the item? - Go to your orders and start the return
- Select the return method
- Ship it!
Ships from: Amazon Sold by: Amazon Warehouse
Other Sellers on Amazon
82% positive over last 12 months
Rheem 18kW 240V Tankless Electric Water Heater
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
Brand | Rheem |
Product Dimensions | 14.5"W x 18.25"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 18000 watts |
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About this item
- 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
Customer ratings by feature
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From the brand
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A History of Comfort
Brothers Richard and Donald Rheem founded Rheem Manufacturing Company in Emeryville, CA, in 1925. While the company has produced a number of products in its nearly 100 years of operation, Rheem is currently the only manufacturer in the world that produces heating, cooling, water heating, pool & spa heating and commercial refrigeration products, and it is the largest manufacturer of water heating products in North America.
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Tankless Gas Water Heaters
Enjoy the comfort and convenience of continuous hot water. Available in both indoor and outdoor models, Rheem tankless gas water heaters are loaded with features to help you save money and reduce water waste. And these ultra low NOx tankless solutions are up to 96% efficient to reduce energy costs, too.
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Tankless Electric Water Heaters
Enjoy the comfort and convenience of continuous hot water on demand with a Rheem tankless electric water heater. Our electric models are great for homes with busy families, homes with luxury bathrooms and vacation homes, while our point-of-use electric models are ideal for a single faucet or shower.
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What We Supply
Enjoy the comfort and convenience of continuous hot water. Available in both indoor, outdoor, gas or electric models, Rheem tankless water heaters are loaded with features to help you save money and reduce water waste. Rheem tankless solutions are up to 96% efficient to reduce energy costs.
Sustainability
For nearly 100 years, Rheem has been a leader in water heating innovation. We continue to lead with our bold approach to improvements for our products and processes to dramatically cut our impact on the environment, while empowering our customers live sustainably.
From the manufacturer
Rheem Tankless Electric Water Heaters
Enjoy continuous hot water so you can do the dishes, wash the laundry, give the pets a bath and still have hot water for a relaxing shower.
Key Benefits
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Saves EnergyHeats water only when you need it, so it uses less energy than a tank-type water heater, making this a sustainable choice. |
Saves MoneyCompared to a tank-type water heater, you could save up to 50% on water heating costs with point-of-use tankless electric water heaters or up to 34% with whole home models according to the Department of Energy (DOE). |
Saves WaterWhen tankless electric point-of-use water heaters are installed close to where you need hot water, less water is wasted down the drain while waiting on hot water to reach the tap. |
Saves SpacePoint-of-use Rheem tankless electric models are compact, allowing them to be installed near a fixture (under a sink, in a bathroom or closet) freeing up valuable storage space in your home. Whole home models can be installed on the wall in a central home location. |
Additional Benefits
- Powerful Performance – Our RTEX 24kW model provides up to 5.9 gallons of hot water per minute (GPM) in warm climates, enough for up to 2 showers and 2 sinks at once. Lower kW models also provide continuous hot water at lower flow rates (from 0.9 to 4.4 (GPM).
- Energy Smart – RTEX models 8, 11, 18 & 24 utilize energy modulation, so they only use the amount of power required to heat the water you need.
- On-Demand Hot Water – Point-of-use models, RTEX 4, 6, & 8 are installed near where you need hot water, so you get hot water fast.
- Optimized Operation – Digital temperature control on the front of each model allows easy set point adjustment (RTEX-04 and RTEX-06 models display outlet temperature only).
- No Venting - Tankless electric water heaters do not require venting, so they can be installed anywhere inside the home.
RTEX-04 | RTEX-06 | RTEX-08 | RTEX-11 | RTEX-18 | RTEX-24 | |
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Customer Reviews |
3.0 out of 5 stars
155
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3.9 out of 5 stars
157
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3.9 out of 5 stars
295
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4.2 out of 5 stars
280
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4.4 out of 5 stars
1,685
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4.3 out of 5 stars
677
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GPM (Max.) | up to 0.9 | up to 1.5 | up to 1.95 | up to 2.68 | up to 4.4 | up to 5.9 |
Power Source | 120V Electric | 220V Electric | 240V Electric | 240V Electric | 240V Electric | 240V Electric |
Kilowatt (Max.) | 3.5 kW | 6 kW | 8 kW | 11 kW | 18 kW | 24 kW |
Fixtures Served (Max.) | 1 Sink | 2 Sinks | 3 Sinks | 1 Shower, 2 Sinks | 2 Showers | 2 Showers, 2 Sinks |
Height | 5-7/8" | 5-7/8" | 12-5/8" | 12-5/8" | 18-1/4" | 18-1/4" |
Width | 10-7/8" | 10-7/8" | 8-1/4" | 8-1/4" | 14-1/2" | 17-5/8" |
Depth | 2-3/4" | 2-3/4" | 3-5/8" | 3-5/8" | 3-1/2" | 3-1/2" |
Ship Wt. | 4.5 Lbs | 4.5 Lbs | 7 Lbs | 8.5 Lbs | 14.78 Lbs | 17.8 Lbs |
Water Connections | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 3/4" NPT | 3/4" NPT |
Breakers Required | (1 x 30)AMP | (1 x 30)AMP | (1 x 40)AMP | (1 x 50)AMP | (2 x 40)AMP | (3 x 40)AMP |
Product information
Technical Details
Additional Information
ASIN | B01MR7Z39V |
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Customer Reviews |
4.4 out of 5 stars |
Best Sellers Rank | #19,848 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #19 in Water Heaters |
Date First Available | January 19, 2017 |
Warranty & Support
Feedback
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Videos
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Honest Review- Rheem 18kW Tankless Electric Water Heater
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Customer Review: Works great for 2,500 sq ft home.
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HONEST review of Rheem Electric Water Heater
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Customer Review: Causes flickering of LED lights?!
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Product Description
This tankless electric water heater is ideal for mid-range whole-home applications. This unit is ideal for single shower applications in the Midwest. The Rheem Performance tankless electric water heaters offer a continuous, endless supply of hot water. A lower kilowatt unit can provide hot water on demand for single or multiple point-of-use applications while a higher kilowatt unit could provide hot water for a whole house depending on the inlet ground water temperature. Tankless electric water heaters save space, save energy, save money, and require no venting. The sleek, compact size, 90 percent smaller than a tank, allows you to save space and place the unit wherever you want, including under a sink. Tankless units only draw energy when hot water is flowing, while traditional tanks are constantly drawing energy to keep the water in the tank at the desired temperature. Rheem's self-modulating technology can save Up to 50 percent on your water heating bill.
Product guides and documents
Compare with similar items
This Item Rheem 18kW 240V Tankless Electric Water Heater | Recommendations | dummy | dummy | dummy | dummy | |
Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | |
Price | $496.12$496.12 | -7% $335.00$335.00 List: $359.00 | $299.99$299.99 | $469.99$469.99 | $299.99$299.99 | $379.99$379.99 |
Delivery | Get it as soon as Wednesday, Apr 3 | Get it as soon as Tuesday, Apr 9 | Get it as soon as Wednesday, Apr 3 | Get it as soon as Wednesday, Apr 3 | Get it as soon as Wednesday, Apr 3 | Get it as soon as Wednesday, Apr 3 |
Customer Ratings | ||||||
Temperature Control | 4.0 | 4.9 | 3.9 | 4.0 | 4.4 | 2.9 |
Easy to install | 4.0 | — | 3.9 | 4.0 | 4.5 | 3.8 |
Energy efficiency | 4.0 | 4.8 | 3.7 | 4.0 | 4.6 | — |
Value for money | 3.6 | — | 3.6 | 3.9 | 4.3 | 2.3 |
Tech Support | 3.2 | 4.8 | 3.5 | 3.8 | 4.1 | — |
Sold By | Amazon.com | Amazon.com | Sain Store | THMOS | ECOTOUCH | Sain Store |
capacity | 18 gallons | — | 240 gallons | — | 18 kilowatts | 240 gallons |
power source | ac dc | Hard Wiring Required | AC | 208~240V Hardwire | 240V/60Hz hardwire | Corded Electric |
mounting type | — | Wall | Wall | — | Wall | — |
heat output | 18 kilowatts | 14400 watts | — | 27 kilowatts | — | — |
material | Stainless Steel | lead free | — | — | Metal, Aluminum, Brass | — |
style | Heater | Plus | Indoor Installation | 27kW | Digital | Indoor Installation |
Important information
18000 watts
240 volts
Related Posts
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, ease of installation, and size of the water heater. For example, they mention that it works well, takes up very little space, and is a perfect fit for an office space. That said, opinions are mixed on temperature adjustment, quality, and value.
AI-generated from the text of customer reviews
Customers like the performance of the water heater. They mention that it works well, the showers and sinks work great, and the system performs well running the washing machine, dishwasher, and shower. Some say that it's fantastic for a three-person home, amazing, and perfect for their home.
"...This one is doing great and haven’t noticed any significant water temperature fluctuations other than maybe for the first week which I call a break..." Read more
"...It’s been only a few months but the system performs well running the washing machine, dishwasher and shower all running at the same time...." Read more
"...Then the new one brand new out of the box did not work properly then finally fail 1yr and 2 months after purchase...." Read more
"...I had it hooked up now for about 3 months. It works great! It cut my electric bill about 30%. Just as I thought it would. Very happy with it...." Read more
Customers find the installation process of the water heater to be super easy. They mention that it's small, frees up space, and easy to connect. Customers also say that the directions are okay, but following electrical instructions is essential. They say that with a higher power rating, it'll be easier to use hot water at multiple points.
"...to help run wire, and as long as you know what your doing it’s very easy to wire up. DO NOT ATTEMPT IF YOU HAVE NO ELECTRICAL KNOWLEDGE...." Read more
"...It is super easy to install. it is small, frees up space, another bonus. costing half of a tank heater...." Read more
"...Otherwise, the install was fast and straightforward...." Read more
"Easy to install. I needed both a plumber and an electrician, which, together cost over $1000.Mine was a very short run to the fuse box...." Read more
Customers like the size of the water heater. For example, they say it takes up very little space, is compact, and is a perfect fit for an office space. Some mention that the tankless system is plenty big enough for their needs.
"...In addition to heating the water it also takes up much less space than the prior 40-gallon unit it replaced leaving us much greater closet space..." Read more
"...It is super easy to install. it is small, frees up space, another bonus. costing half of a tank heater...." Read more
"...It makes cold water hot, and saves a bunch of space." Read more
"...I really don’t have any complaints. Super easy to install. Takes up like no space. No more water tank to explode damaging my basement...." Read more
Customers have mixed opinions about the temperature adjustment of the water heater. Some mention that it provides endless hot water to customers outside shower easily, it makes cold water hot, and holds heat for long periods of time. However, others say that the unit provided is defective, does not heat appropriately, and the water temperature fluctuates from hot to lukewarm when they're in the shower.
"...But after the first 4-7 days of usage it leveled out and a hot shower stays hot no matter how long or short it is...." Read more
"...Longer runs would cost more.Important to know these di not provide instant hot water, only unlimited hot water once the flow clears your pipes...." Read more
"...for this model you need 2x40amp breakersthe water is instantly hot, it easily serves 2 showers, one shower+dishwasher and laundry..." Read more
"...I replaced it, still the unit wouldn't heat. So they sold me new inlet and outlet water sensors and a new flow sensor. That didn't fix it...." Read more
Customers are mixed about the quality of the water heater. Some mention it's well-engineered, easy to install and use, and provides a consistent flow of hot water. Others say that it failed three times in that 26 months, and had too many "E-5" error codes that could not be cross referenced.
"...It tripped the breaker thankfully. I contacted the company and they sent me a new wire harness. I replaced it, still the unit wouldn't heat...." Read more
"...We run it at 110 degrees and it keeps up...." Read more
"...It had failed three times in that 26 months, and this was the last straw for me...." Read more
"...tankless has been in my home for over a month and it still trips the circuit breaker...." Read more
Customers have mixed opinions about the value of the water heater. Some mention that it's the best value for the money, and well worth the change. However, others say that it was overpriced, and installation was very expensive.
"...Oh so nice for long baths & showers. Saving money every day not having to constantly beat a tank. Plus the price is great!!" Read more
"...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...." Read more
"...Husband had no problem with installation. Decent value and works like a charm!" Read more
"...was very tough to install, even by my licensed plumber, but it is well worth it. It works exactly as promised, and is a real energy saver...." Read more
Customers are dissatisfied with the capacity of the water heater. They mention that it can only handle one shower and one sink faucet at once. Some say that the unit cannot run multiple appliances at once, and that it cannot keep up with a single shower.
"...A bigger concern was that this tank can not support two simultaneous showers...." Read more
"...Incandescent bulbs do not flicker- can only handle 1 shower + 1 sink faucet at once...." Read more
"...were 10-15 degrees colder than predicted, at full flow unit was not able to keep up, and produces and E5 error, but reducing shower flow slightly..." Read more
"...You cannot run multiple fixtures at one time because that amount of water flow does not allow the unit to keep up...." Read more
Customers are dissatisfied with the durability of the water heater. They mention that it broke shortly after purchase, and the second heating element fell apart a year later. Some say that the heating element blew up and flooded their office. They also mention that the internal part failed and the weld cracked.
"...if it was a manufacturing or handling issue, but some of the sheet metal frame was bent...." Read more
"...Nope, after repressurizing, a weld must have cracked and a slow drip came down the 1st pipe element housing. I thought maybe its not tight enough...." Read more
"...all burned up, with gaping holes, twisted metal, and exposed, broken metal coils. The other element looked perfect...." Read more
"...One of the prongs was bent over indicating that quality testing was never performed...." Read more
Reviews with images
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Top reviews
Top reviews from the United States
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Overall I’m very pleased with this unit as we have 5 kids so running the dishwasher, doing laundry, and bathing can use A LOT of water for us and the 50 gal water heater we had just couldn’t keep up. This one is doing great and haven’t noticed any significant water temperature fluctuations other than maybe for the first week which I call a break in period. One shower could get hot then cold several times before getting out. But after the first 4-7 days of usage it leveled out and a hot shower stays hot no matter how long or short it is. Hope this helps anyone looking into these water heaters!
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 breakers
the 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)
Top reviews from other countries
We are on a well and the water is very cold coming up out of the ground, so I set the tank at minimum and it heats the well water to roughly ambient temperature. My gas bill has dropped by 70% and my electric bill has only risen about 3%.
This is the only way to go!