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Rheem

Rheem 18kW 240V Tankless Electric Water Heater & Siemens Q120DFN 20 Amp 1-Pole Dual Function (CAFCI/GFCI) Plug-On Neutral Circuit Breaker

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$440.78 Why this price?
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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, May 18
Order within 10 hours and 55 minutes
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Features

  • Product 1: External digital thermostatic control with LED display (+/1 degree accuracy)
  • Product 1: Most advanced self-modulation, adjust power to meet hot water demand
  • Product 1: Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Product 1: Simple installation bottom 3/4 inch NPT water connections
  • Product 2: Simply installs like any other breaker, now without the pigtail
  • Product 2: 10,000 AIC
  • Product 2: HACR and SWD rated
  • Product 2: UL Listed

Description

Rheem 18kW 240V Tankless Electric Water Heater 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. Siemens Q120DFN 20 Amp 1-Pole Dual Function (CAFCI/GFCI) Plug-On Neutral Circuit Breaker, Black(Pack of 1) Siemens introduces the new simple, spacious and secure Plug-on neutral load centers with electronic breakers. The dual-function circuit breaker combines class A 5mA GFCI and combination type AFCI, protecting against both arc faults and ground faults. This, along with the new self-test feature, makes it the first in class in electrical safety for homeowners. This Dual Function circuit breaker is the same, reliable design, without the pigtail, specifically designed for the Plug-On Neutral Load Centers. Simple, Spacious, Secure. The Siemens Plug-On Neutral Combination Type AFCI breaker detects arcing faults (an unintentional arcing condition in a circuit) that standard circuit breakers are unable to detect. This AFCI circuit breaker is the same, reliable design, without the pigtail, specifically design for the Plug-On Neutral Load Centers. These breakers now only have a single load lug. The branch neutral conductor is returned to the neutral terminal bar for simpler and quicker wiring.

Brand: Rheem


Special Feature: LED Display


Color: Silver


Wattage: 18000 watts


Voltage: 240 Volts


Brand: ‎Rheem


Special Feature: ‎LED Display


Color: ‎Silver


Wattage: ‎18000 watts


Voltage: ‎240 Volts


Maximum Flow Rate: ‎4.4 Gallons Per Minute


Efficiency: ‎High


Style: ‎Heater + 20 Amp 1-Pole Dual Function


Mounting Type: ‎Wall


Is Electric: ‎Yes


Manufacturer: ‎Rheem


Item model number: ‎RTEX-18


Item Package Quantity: ‎1


Special Features: ‎LED Display


Date First Available: March 5, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, May 18

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.

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Top Amazon Reviews

    • Tankless water heater
Style: Heater
Great product, installed it in a tiny house and works wonderfully
Reviewed in the United States on December 26, 2024 by Mirian
    • Easy install but may need electrician for the wiring from the breaker box to the hot water heater.
Style: Heater
Works great. Plumbing install was pretty easy but had to hire an electrician for the wiring from the breaker box to the hot water heater. Unit easily keeps up with primary bathroom that includes shower, bathtub and two sinks.
Reviewed in the United States on February 5, 2025 by Duane
    • Works very well
Style: Heater
Was cheaper than Home Depot. Pulls about 8kw upon use. You may feel the need to set the temp to 145 if you are converting from water heater tank. You don't unless you have multiple hot water using devices going at the same time. Biggest acclimatization is that it'll get warmer before it gets hot in the shower. You'll need to either let it run longer to get to the final temp or go into the shower and know that you need to adjust as you're showering. ... show more
Reviewed in the United States on September 25, 2024 by Amazon Customer
    • Hot Garbage
Style: Heater
New Review: Ok, this lasted 26 months before I finally ripped it off the wall and replaced it. It had failed three times in that 26 months, and this was the last straw for me. After almost exactly one year, one of the heating elements fell apart. It was literally in pieces. I replaced the bad element with a third-party element, and almost exactly one year later, the second factory heating element fell apart, too. My water has very low mineral content, but after the first one failed, I cleaned the elements every six months along with flushing the whole system. That still didn’t keep the factory elements from failing. The third-party elements looked fine. I bought some spares just in case. Finally, last weekend I started noticing that the water coming out of the tap was CRAZY hot. When I started looking for the problem, I found that one of the heating elements was stuck on all of the time. The water would just keep heating up inside until the thermal protection circuit turned it off. Something in the electronics had failed. There was another issue with the water heater unrelated to these failures, too. I have solar panels on my roof, and I found that whenever someone would turn on the hot water, the solar inverter would turn off. The water heater was injecting too much electrical noise onto my power lines, which the inverter didn’t like. There is absolutely zero electrical noise filtering on the water heater, so I added my own. This fixed the solar problem, but the filter that I added consumed some power all of the time, so it wasn’t saving me energy like I’d wanted. I replaced it earlier this week with a 24kW model from a different manufacturer thar I found locally. The new one, even though it has a higher power rating, uses nearly half of the energy required by the Rheem to take a shower, 7kW vs 12kW. Since it has a higher power rating, it’s easier to use hot water at multiple points simultaneously. It also has a dynamically adjusting flow meter, compared to the Rheem where I needed to add an external flow restrictor. Don’t buy this heater. Spend a few dollars more and get something that is built better, doesn’t constantly break down, and doesn’t cost as much to operate. Get a Stiebel Eltron Tempra 24 Plus, which costs a bit more up front, but works much, much better. Original Review: A week shy of one year ago, I purchased this to replace the old water heater in my home that had quit working. The installation was easy, it only took me an hour or so to swap out, and it worked great. For a year. My warranty will expire in three days, and the water heater stopped working a few days ago. It wasn’t completely dead, and it would heat the water to around 85 degrees, but that still makes a miserable shower. I called the warranty department, and they sent me a troubleshooting guide. Using this guide, I determined that one of the heating elements was open. Honestly, I didn’t feel like it was worth the effort of trying to get this fixed under warranty, so I ordered a replacement (two, so I could replace them both) 9kW heating element here on Amazon and they were delivered the next day. The maintenance instructions say that you should pull the elements out every 6-12 months and soak them in vinegar to remove any scale, but admittedly, I hadn’t done that. My water is very soft with a low mineral count, so I tend to neglect things like this. When I removed the bad element, there were no mineral or calcium deposits on it, but the element was in horrible shape. It was all burned up, with gaping holes, twisted metal, and exposed, broken metal coils. The other element looked perfect. The bad one looked like it had been in a furnace. I replaced the elements with new ones, and it’s operational again. I’m happy with this heater while it is working, but I don’t know if I’m crazy about possibly needing to replace the elements once a year. Hopefully, I just had bad luck with the one element. ... show more
Reviewed in the United States on March 20, 2022 by ES
    • Cost savings in a small box!
Style: Heater
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 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) ... show more
Reviewed in the United States on August 7, 2023 by xander

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