Brand | Rheem |
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Product Dimensions | 8.25"W x 12.63"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 13 KW |
Voltage | 240 Volts |
Maximum Flow Rate | 3.17 Gallons Per Minute |
Heat Output | 13 Kilowatts |
Manufacturer | Rheem |
Part Number | RTEX-13 |
Item Weight | 0.01 ounces |
Item model number | RTEX-13 |
Is Discontinued By Manufacturer | No |
Thickness | 1 Inches |
Item Package Quantity | 1 |
Special Features | LED Display |
Included Components | Rheem RTEX-13 Residential Tankless Water Heater |
Batteries Included? | No |
Batteries Required? | No |
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Ships from: Miami Water Heater Sold by: Miami Water Heater
To see product details, add this item to your cart.
Ships from: Miami Water Heater Sold by: Miami Water Heater
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84% positive over last 12 months
100% positive over last 12 months
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
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Purchase options and add-ons
Brand | Rheem |
Product Dimensions | 8.25"W x 12.63"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 13 KW |
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About this item
- External adjustable digital thermostatic control with LED display (+/1 degree accuracy
- Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
- Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
- 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
- Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
- 54 A
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This Item Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY | Recommendations | dummy | dummy | dummy | dummy | |
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Price | -56% $298.90$298.90 List: $680.00 | $239.99$239.99 | $299.99$299.99 | $299.99$299.99 | $239.99$239.99 | $1,385.00$1,385.00 |
Delivery | Get it as soon as Wednesday, Mar 20 | Get it as soon as Wednesday, Mar 20 | Get it as soon as Wednesday, Mar 20 | Get it as soon as Wednesday, Mar 20 | Get it as soon as Wednesday, Mar 20 | Get it Mar 20 - 22 |
Customer Ratings | ||||||
Energy efficiency | 4.3 | 4.0 | 3.8 | 4.6 | 4.6 | — |
Temperature Control | 4.1 | 4.0 | 3.9 | 4.4 | 4.5 | — |
Easy to install | 4.2 | 4.0 | 4.0 | 4.4 | — | — |
Value for money | 4.0 | 3.8 | 3.7 | 4.4 | — | — |
Tech Support | — | 3.8 | 3.5 | 4.1 | 4.0 | — |
Sold By | Miami Water Heater | THMOS | Sain Store | ECOTOUCH | yuanroo | GlobalTowne |
capacity | 1.5 gallons | — | 240 gallons | 18 kilowatts | 18 gallons | 10 gallons |
power source | Battery Powered | 208~240V Hardwire | AC | 240V/60Hz hardwire | ac | Corded Electric |
mounting type | — | Wall | Wall | Wall | — | — |
material | — | Alloy Steel | — | Metal, Aluminum, Brass | — | Copper |
style | Heater | 11kW | Indoor Installation | Digital | Stainless steel | Outdoor Installation |
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From the manufacturer
About Us
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 manufacturer that produces heating, cooling, water heating, pool & spa heating and commercial refrigeration products, and it is one of the largest manufacturer of water heating products in North America.
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Product information
Technical Details
Additional Information
ASIN | B01NAUZJPE |
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Customer Reviews |
4.4 out of 5 stars |
Best Sellers Rank | #18,920 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #20 in Water Heaters |
Date First Available | January 19, 2017 |
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Product Description
Professional classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications
Top Brand: Rheem
Important information
13 KW
240 volts
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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 space of the water heater. They mention that it works well for their low-pressure system, and is easy to install. They appreciate the quality, and find it to be a good space saver for small usage. That said, some are disappointed with the durability and leakage. Opinions are mixed on temperature, and value.
AI-generated from the text of customer reviews
Customers like the performance of the water heater. They mention it works well for their low-pressure system, and they've never had any issues with it. Some say that it's very nice and works great with good heat.
"...Item works extremely well, water gets hot in bathroom almost instantly, the unit in in basement below bathroom...." Read more
"super easy to install and has been working great for a long time.. i would say it takes up to 30 seconds to a minute to get hot with our plumbing..." Read more
"...All in all, this is a pretty good unit, and does its job very well." Read more
"Works as advertised and well packaged" Read more
Customers find the installation of the water heater to be easy. They mention that the unit was easy to install, the plumbing was very easy, and the unit is an easy replacement for a traditional water heater. They also mention that it holds the heat very well and that maintenance is pretty easy.
"super easy to install and has been working great for a long time.. i would say it takes up to 30 seconds to a minute to get hot with our plumbing..." Read more
"this was a pretty easy replacement for the previous unit which had corroded inside and failed to provide any hot water...." Read more
"Worked, fair price, easy to install, but it could not heat our one rainfall shower alone...." Read more
"...It was easy to replace my last unit that had burned out; only took about an hour total. Some good and bad points:First the bad:..." Read more
Customers are satisfied with the space-saving capabilities of the water heater. They mention that it is perfect for small usage, and it saves space and energy. The product is a powerhouse for its size, and meets their needs. The water heater provides unlimited hot water and never runs out.
"...And one thing I love about these is they are so small and light and now that the wiring's re-done it will be a breeze to swap out in a few years..." Read more
"...Keeps up with demand from one shower just fine, even in winter...." Read more
"...a tiny house and had very limited space and this was so perfect and tiny!! We never run out of hot water and the water is HOT!..." Read more
"...and using a 2gpm shower head we get extremely hot water with a never ending supply. I live in WA state and house is on a well...." Read more
Customers like the quality of the water heater. They say it's a great product, perfect for their house, and an amazing find.
"...All in all, this is a pretty good unit, and does its job very well." Read more
"...standard WH went out I found this to be the most economical and best quality option and also the most efficient for our needs..." Read more
"Hot water on demand, and it stays hot. Fabulous." Read more
"...No light flickering or dimming just glorious hot HOT water. This thing is amazing...." Read more
Customers are mixed about the temperature of the water heater. Some mention that it provides more than adequate hot water for any single usage, while others say that it does not get fully hot. The over-temp control allows you to feed it with hot water, and it produces hot water almost instantaneously. However, some customers say that the unit does not provide hot water in their area and that it takes a little time to heat the water.
"...Item works extremely well, water gets hot in bathroom almost instantly, the unit in in basement below bathroom...." Read more
"...the washing machine, which has not been throttled in any way, does not get fully hot...." Read more
"...Produces hot water 'almost' instantaneously and keeps a pretty constant and stable temperature once its left running for a bit...." Read more
"...Haven't had it long, but it amazes me. Hot water and all you need to take a long shower. Love it, have it in are cabin, just what we needed." Read more
Customers are mixed about the value of the water heater. Some mention it's easy to install, has a great price, and heats water for bathroom sink and is a lot cheaper on the electric bill. However, others say it' a waste of money, not suitable for their application, and produces only a little hot water.
"...Great value for money, especially if you install it yourself...." Read more
"...WORTHLESS, WORTHLESS, WORTHLESS device and support." Read more
"...The price seems right and they seem to work OK. This is in a rental apartment. I might consider them for a vacation home...." Read more
"Worked, fair price, easy to install, but it could not heat our one rainfall shower alone...." Read more
Customers are dissatisfied with the durability of the water heater. They mention that it is not reliable, it died within the first few days, and has a limited lifetime. Some customers also say that the inlet cracked after 2 months and started tripping the breaker constantly.
"...probably broke rust off the heating elements so it started tripping the breaker constantly...." Read more
"This unit failed within 5 months of use...." Read more
"...These units only last two or three years max...." Read more
"...The heating element in that one blew up in Dec 2022. I replaced the unit with another Rtex-13 tankless electric water heater...." Read more
Customers are dissatisfied with the leakage of the water heater. They mention that the unit started leaking at the intake and out flow, causing a bad water mess. Some customers also mention that there was no way to drain water from the tank to prevent freezing.
"Had to return because there was no way to drain water from tank to prevent freezing. I did return it." Read more
"the supply fitting leak had to replace them" Read more
"This was an emergency installation. Our water heater tank leaked...." Read more
"...to make certain all the fittings are water tight as they are prone to leak easily if care is not taken to ensure they seal properly...." Read more
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Delivered Nov 11, 2021
TLDR: It's all about the GPM
About 2 months in and no problems so far. This is my 1st tankless and quite happy with it. Doesn't take any longer to get hot water than it did with the tanked one. A few seconds depending on which side of the house you're on and a moment to settle as the pipe it's traveling through warms up. I was a little on the fence about the wattage and really didn't fancy needing two 240 lines for the next size up, but this did the trick. I've read some stuff saying 13kw wouldn't be up to the task of a hot shower in the northern states but took a chance and it's working just fine. That being said if the GPM is too much it wouldn't keep up, but it's more than enough for a very hot shower at just over 1 GPM, maybe 1.5 GPM total flow. It will do just under 1 GPM scalding injury hot with no cold water mixed in, somewhere between 1~1.5 GPM total flow with a little cold water in the mix for extremely hot shower hot.
Some data to clarify... In PA just north of Philly, currently mid January and it's been pretty cold, 20 degrees most nights recently but it's dipped to 10, and I'm on frigid cold well water, and getting a hot shower I still need to mix in a some cold water or it's hot enough to burn you. So plenty good. Hot water heater to shower is roughly a 40~50 foot run through 3/4" pex in an unfinished unheated basement then down to 1/2" copper right at the bathroom and I get just under 1 GPM with the hot water valve wide open (after some previous adjustments to the flow rates on the feed lines)... 1 gallon in 1.18 minutes whatever that equates to. Now I did meter the hot water to everywhere but the washing machine via valves in the basement a few years back and that's working to my advantage now. I was dealing with an annoying ex-girlfriend who would run the hot water wide open and act like there was a problem with the heater or plumbing when she used up 40 gallons of hot water in under 10 minutes (with the tanked unit), or the water wasn't getting hot enough while she was blasting 4 GPM of cold water. And her disdain for logic and reason necessitated me finding a way to idiot-proof the situation. So my system is capable of delivering water much faster. Keep in mind I have a septic system as well so all this ridiculous water use was going into the back yard ready to overload my leech field.
But regardless my typical routine (even when I had the tank unit and doing the same now) is open the hot water valve a little more than half way, give it a sec to get up to temp, then mix in just enough cold water so it's not going to put me in the burn ward. If you think I don't like hot showers it's hot enough to turn my normal Scottish pallor red and steam up the bathroom like a sauna. BUT it's not some kind of deluge GPM-wise, and I've adjusted the water like I have a functioning brain. Bathroom shower, sink, and kitchen sink will get hot enough to be steaming and scald you with the hot water valves full open which is (adjusted to) around 1 GPM +/- .
And also the washing machine, which has not been throttled in any way, does not get fully hot. It could if I metered the hot water a little bit but I'm up in the air on steaming hot water in the washer but it taking a little longer, vs. just leaving it as is with warm water and it finishing quicker. Anyway, too many GPM and the 13kw heater can't heat it fast enough to keep up. But it does a more than acceptable job, even in PA winter, if you're not a glutton with the water.
If you need to use more than one fixture at a time and expect more than lukewarm water, especially if one of them is a shower, this is likely not gonna cut it by itself. If you have a very high flow situation like a waterfall or rain type shower head, and/or have one of those stupid single handle valves that doesn't give you any indication of how the hot and cold are being mixed, and/or you have people who can't process mixing the hot and cold water in a sense-making way, you may want to go a step up to at least 18kw or more for full house, or maybe a 13kw main and another small one right at the bathroom to boost it. If you can live with just under 1 GPM scalding hot water, just over 1 GPM mixed hot water for a shower, 2 or 3 GPM of warm water, then you should be ok with 13kw.
If I was to have one complaint with this unit it's that it needs too much flow before it kicks on. For example if I just want to wash my hands real quick and don't want ice cold water and don't need tremendous water flow, my typical opening of hot and cold valves like a quarter turn wont be enough flow to trigger the hot water heater to kick on. It won't come on till the hot water valve gets close to halfway open. Haven't looked into if that's adjustable or not but don't believe it is.
Aside from that build quality is about what you'd expect these days, and by that I mean marginally acceptable at best. I really like the stainless heating tubes, being that I have acidic well water, but I have a feeling they're probably 304 rather than more corrosion resistant 316. And they screwed up corrosion resistance putting failure prone (when it comes to acidic water) brass in the mix anyway. But end to end 316 stainless units don't exist to my knowledge. "We can't design things for extreme cases like acidic or hard water!" ... Yes you can, very easily, you just want to make disposable crap so we need to buy more. Could you imagine buying one of these that would last forever no matter your water type and just having to replace the elements and flow sensor every few years, maybe clean some scale out of it if you had a lot of minerals? And some of the comparable units had copper tubes which would be far worse than 304 and brass, so not bad for what's available. And one thing I love about these is they are so small and light and now that the wiring's re-done it will be a breeze to swap out in a few years once my water eats it up. No more pumping out a 40 gallon tank and humping the heavy pieces of crap in and out of my basement :)
And I feel I should qualify I'm really not some kind of water conservation nut. It's just most of my life having wells and septic systems you're much more in touch with where you're water's coming from and where the waste is going. It's great to have no water or sewer bills and be self sufficient, but I'm responsible for them, and both are expensive nightmares with direct and immediate impact if something goes wrong. It just makes sense to use what you need and respect the system. No water source is limitless and waste doesn't just magically disappear.
Reviewed in the United States on June 1, 2023
Top reviews from other countries
Reviewed in Canada on February 21, 2024