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The Rheem 18kW 240V Tankless Electric Water Heater delivers up to 4.4 gallons per minute of perfectly tempered water with ±1°F accuracy via an external LED thermostat. Featuring advanced self-modulation for energy-efficient heating and durable copper immersion elements, this compact wall-mounted unit offers professional-grade performance and easy installation, making it the smart choice for modern homes craving endless hot water on demand.
Brand | Rheem |
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 |
Maximum Temperature | 140 Degrees Fahrenheit |
Heat Output | 18 Kilowatts |
Efficiency | 99.8% |
Style | Heater |
Maximum Operating Pressure | 150 |
Mounting Type | Wall |
Is Electric | Yes |
Manufacturer | Rheem |
Item Depth | 18.25 inches |
UPC | 020352685335 |
Global Trade Identification Number | 00020352685335 |
Part Number | RTEX-18 |
Item Weight | 14.78 pounds |
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 |
F**S
Buen servicio
No lo install todavia, pero creo que estara bien, buen servicio
J**.
Failed after storm on both water heaters at separate places
Update: Ended up being a blown fuse. Replaced and working well now.Bought two of these for our cabins and has been working fine til a storm and now they both will not work. Displays will not come on at all. Lights only flickered once and all other appliances are fine. Can't find a reset button and power cycling is doing nothing. $800 bucks down the drain and no hot water now.
M**N
I like this heater for our self built new house. saves money! read on.
Do your research.Understand what you are getting.This is not the big tank that sits and keeps water hot all day and night.It only uses energy (electric in this case) when a hot water faucet turns on.I read and read some more and did some research. oh and then did some more!I have installed many tank water heaters but never tankless.This heater requires 2 40 am circuits. In my case my house was only framed out and was easy to install electric requirement. If you are a handyman or high level dIY'er this is easy to install.If not get electrician to do the electric work. (and make sure you have enough AMPS)With many reviews I see people having issues with not enough electricity IE AMPS coming into the house to be able to do an electric water heater.Also know what the water temp is coming into your house. I recommend checking water temp in winter. And check with a thermometer do not believe charts. every place even in same city can be different. Do your research. This heater would not work for house in Chicago in the winter. You would want/need bigger. and is fine for 3 of us with 2 bathrooms.Read instructions and also do some reading online. I found BEFORE I bought it that you should clean it with vinegar every 6 months. Knowing that I installed to make it easy to clean IE flush. Just did my first flush and was piece of cake! (I do wonder if my old tank water heaters in old house would have lasted longer if I had done maintenance on it...even tank water heaters your suppose to clean)I am in central Texas using well water going thru 900 feet of pex pipe buried about a foot. In winter water about 60 degrees summer much warmer. We can shower and run another water faucet easily with temp. set at 120 degrees. we have limiters on all fixtures ie 2.5 gallons per min. on all faucets except bathtub.For bathtub we open faucet about 75% open and fill big 6 foot soaker tub in about 10 min. Bathtub faucets can push out about 7 gallons a minute.Have used it from February thru August and no issues.Would buy again and recommend to friends and family but only if situation IE electrical requirement and water temp were correct for unit.
F**I
Updated Review 2+ years Not Great tankless water heater!
I'll leave the original review below. It's been a little over 2+ years and have had to replace every single part and then finally replace the entire unit. Then the new one brand new out of the box did not work properly then finally fail 1yr and 2 months after purchase.This unit should be removed from sale and recalled that is how dangerous they are.If you have this unit installed I would highly recommend take it out and replacing with something else. It almost burned my house down!Just take a look at the pictures in this review and see for yourself.Okay full detail review below.1st I'd like to say Rheem makes good products but this is not one of them. Here's why:1st unit failed only less than 1 year of use. The elements exploded inside and needed to be replaced. Fine no problem, kill breaker, shut water off, unscrew 4 wires, take out element replace, re-screw wires, done in 30 minutes. Far beats dealing with a leaking water heater tank with 2 inches of water in your basement. Or lugging a 50lb broken tank up your stairs to replace at the Lowes or Home depot.Ok so I put the new elements in and it's heating again. Not more than a few months later the wire harness started arcing and fused together melting off and almost catching fire. I happened to see the arcing when the unit was on and didn't realize this was not part of how it operates. Thought it was just how it is.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. So they sold me new inlet and outlet water sensors and a new flow sensor. That didn't fix it. So they said the motherboard must have fried. So I replaced the motherboard. That didn't fix it. So I purchased a completely new one.I mount the new one hooked it up and the water heater would stop heating randomly during a shower. So I set it to bypass mode 125 degrees and said "heck with the temp controls just give me heat" So a brand new unit I cannot even set the temperature. But I figured 125 is hot enough. Okay moving on. Fast forward to a few days ago, Sept 2nd 2023 brown colored water shot out of my shower head and I knew right away the heater blew. It made 1 year.I open the element rods and sure enough the 1st one exploded worse than any before. Okay no problem, let me swap it with a spare. So I did but.. I had to remove the entire unit from the wall and shake and empty out all the guts that exploded sitting inside the element housing. Still not that hard. So I did it see picture of sink.. EZPZ right? 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. So I tightened it more and the crack go worse and went from a small drip to a full stream. I confirmed it was coming from a welded joint not the threads on the element rod. Okay now the entire unit is trash and needs to be junked all because as I was tightening the element rod it put stress on the joints and cracked them. This is horrible quality in the build and should not happen.So I put the old one back in and swap every part. Wire harnesses, motherboard, elements and finally the sensors. Oh but the sensor's I tightened too much and they broke through the housing which also makes the entire unit useless as that cannot be repaired. So I threaded bolts into their holes and set it to bypass. I ordered a Mizudo instead which does not have copper housings, instead cast aluminum and does not have it's heating rods mixed with the water like this and many unit's have. So far it's been excellent.I highly recommend not purchasing these Rheem electric water heaters for 2 reasons. Fire hazard and quality. They constantly break.Amazon should remove this from their store before someone's house burns down and someone gets hurt or killed.Original Review BelowI love this water heater. 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. It takes longer to get hot water at the furthest end of the house but it’s so worth it. Once it’s hot it stays hot and I can run a shower plus 2 faucets before I start losing heat. This one took 2 dbl 40amp breakers and it’s powerful enough to heat multiple faucets simultaneously. We never take more than 1 shower at a time anyway with a family of 4. Hasn’t been a problem keeping up with our hot water needs at all. And for the price? This is a great purchase. Ditch the tank! You’ll thank yourself later.
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