Stiebel Eltron Tempra 29 Plus Electric Tankless Water Heater, 28.8kW, 240V
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Availability:
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Arrives
Monday, Aug 31
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Size: 29 (kW)
Style: Tempra Plus
Features
- On demand a continuous and unlimited supply of hot water
- Sleek design saves space and no venting required, It also features two different temperature memory presets, making it easy to adjust for personalized needs.
- Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts
- Requires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence
Description
Get hot water for your entire home with this Stiebel Eltron Tempra 29 Plus Tankless Electric Water Heater. Made in Germany with a 100 years of engineering excellence, this energy-efficient heater delivers up to 34% savings on water heating costs with 99% efficiency. Featuring exclusive German-patented technology that automatically maintains desired temperatures even during high demand. Every family member enjoys the perfect shower without disruption. Self-modulating technology continually adjusts to ensure the minimum electricity is used. The sleek, compact design installs easily and requires no venting. Whether it's morning showers, laundry, or dishes, you'll always have hot water when you need it. Tempra 29 Plus provides hot water at a constant temperature for up to 3 showers in warm climates, or 2 or 3 bathrooms in showers climates. See sizing guide to determine which model is best for you. Stiebel Eltron invented tankless electric water heating technology over 100 years ago and remains the industry pioneer with unmatched German engineering excellence.
Brand: Stiebel Eltron
Capacity: 0.39 gallons
Power Source: Hard Wiring Required
Product Dimensions: 16.63"W x 14.5"H
Special Feature: LED Display
Power Source: Hard Wiring Required
Special Features: LED Display
Wattage: 28.8 KW
Voltage: 240 volts
Flow Rate: 3 gpm
Heat Output: 28800 watts
Efficiency: High Efficiency
Maximum Pressure: 150 psi
Mount Type: Wall
Capacity: 0.39 gallons
Item Dimensions W x H: 16.63"W x 14.5"H
Item Weight: 19 pounds
Color: White
Style Name: Tempra Plus
Brand Name: Stiebel Eltron
Model Number: 239223
Number of Items: 1
Unit Count: 1 Count
Manufacturer: Stiebel Eltron
UPC: 040232668623
Global Trade Identification Number: 23
Item Type Name: Water Heater
Manufacturer Part Number: 239223
Material Type: Copper
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Aug 31
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Size: 29 (kW)
Style: Tempra Plus
For five years I've lived in this home with a 75 gallon gas hot water heater. It was in the house when I moved in and to be honest I've never had any complaints. Though it worked fine I decided to change out and because we are going solar roof next year I wanted to go electric. For the same reason we had gone gas furnace to electric heat pump for heating. I needed to decide whether to go electric tankless or electric heat-pump water heater. I went with this unit, the 29kw size. There are only two of us in the house so it seemed more prudent. We have several EVs and the largest tankless along with EV charging would be a fairly large load even for 200 amp service. First the upsides: 1. Unlimited hot water. Both of us can take showers at the same time. The only issue that two of us can have is if both of us want showers while the first cycle of the clothes washing machine is running. Minor limitation. Timing is everything. 2. Absolutely using no power when we aren't using water. We can go away for a month, walk in the door and take a shower and get instant hot water. 3. Accurate temperature control. We have two presets and one has been set for filling the soaking tub. Just press the button and then run pure hot water to fill the tub. The tub gets filled to perfection without figuring out the calculus of the mixing valve which changes depending on the temperature of the water coming into the house. This is a great feature that nobody told me about. 4. The house was originally built with what I consider a shortcoming. The hot water heater was located next to the furnace so it could use the same flue and gas connection. This is fine for ease of install but the hot water heater is on the other side of the house from where the hot water is most often used. Running the shower in the master bath or the sink in the kitchen required a full minute of water running to get hot water. We now installed the tankless beneath the kitchen where we use the water. No flue is required. This unit goes anywhere. Now we have hot water in a hurry where we use it. The downside. I once had a power failure that lasted several days. The water heater was the same as I replaced - used no electricity and vented naturally through a flue. There is something nice about a hot shower during a power failure. That will no longer an option. But then, I haven't lost power in five years. The only upside of the tankless heat-pump water heater would have been its (limited) supply of hot water during a power failure and its natural de-humidification feature. With everything considered, we went tankless. Just a tip, the most often warning I've heard with tankless is impurities in the water that can collect. To reduce this problem we installed a whole-house water filtration system after the water-softener and ahead of the heater. Note that I only gave tech support three stars - that is because I didn't need them so never found out about their quality. I did need power though and didn't have the required six circuit breakers that the unit required. I installed a 125 amp sub panel dedicated to the water heater. The unit has been flawless. It just works.
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Reviewed in the United States on October 22, 2023 by Alan King
Size: 29 (kW)
Style: Tempra Plus
Our 20 year old water heater finally quit. The wife always wanted to replace the old one with a tankless as it was installed in our master closet. It took up valuable space as there is Never enough room for her clothes and shoes.lol. Read the review and decided to order this one Replacement is fairly easy for a skilled DIYer. Unit is light and easy to install on the wall. Unfortunately the unit isn't set up for USA house stud layout as the mounting holes are 15" on center. I ran wood screws into studs on one side and used drywall anchors on the other. That was sufficient to securely mount . Plumbing is straight forward. I replaced flex lines with PEX and insulated the hot sided. Though I don't think it's really needed. Electrical can be a little complicated and you really need to take a look at your main or sub panel that powers the water heater. The old tank heater only needed one 220 volt 30 amp breaker circuit to run. This unit needs 3 separate 220 40 amp circuits to run. This means you need 2 more 220 volt spaces in the breaker box to add those lines. If you don't. You'll need to install a sub box to run. I'm not comfortable with electricity so I hired a professional electrician to properly wire. He had to run 2 new lines and drill through walls to get them from box to heater. It was a task I gladly paid for. That did cost $1200. Seemed a little high but that seems the going rate here in central Texas. Usage. I first set it at the 119 degree setting. Temp was. Ok but I would have to run my show only with the hot side running. It was warm but not super hot. So I turned it up to 125 and definitely had to add cold water to the shower. I finally cranked the thermostat all the way up and can now shower using 50/50 hot to cold water for the perfect shower temp. Since this is an on demand hot water heater expect a minute or so for the hot water to reach your tap if you haven't used In a while or first thing in the am. After that.. it stays hit for ever and I haven't had it run cold. Hope this helps. We are really happy to get this water heater. Now time to install more shelves and closet rods so my wife stops using my area for her clothes. Lol
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Reviewed in the United States on March 11, 2023 by Ken I
Size: 29 (kW)
Style: Tempra Plus
We’ve been using this water heater for 4–5 years in Maryland (close to DC) in a four-bedroom house with 4–5 people and 2.5 bathrooms. It has worked well and we haven’t had any problems. It consistently provides hot water even when two bathrooms are in use. The only minor issue is that the heater sometimes doesn’t turn on when a faucet is opened very slightly (probably less than 0.5 gallons per minute). Otherwise it performs reliably and has given us no trouble so far. Overall: solid, dependable performance — recommended.
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Reviewed in the United States on May 2, 2026 by Matt
Size: 29 (kW)
Style: Tempra Plus
BACKGROUND INFORMATION: We have two Stiebel Eltron water heaters in our home: one 36 KW for our new addition and one 29 KW for the front older part of the house. When we built the new addition, we upgraded the main service to our house to 400 amps, to be sure we had enough amperage for both heaters. A 200 amps sub-panel powers the front older part of the house; this 200 amps panel powers the 29 KW heater. Our old Stiebel Eltron 29 KW heater started producing water which wasn't as hot as before; it was a 1st generation Stiebel Eltron heater about 15 years old. So, I ordered a new 29 KW heater (3rd generation white cabinet). THE UPGRADE INSTALLATION PROBLEMS: The install wasn't as smooth as I was anticipating. First, this heater is in a very small closet, in the older part of the house. The closet was where we did have a tank-type water heater years ago. Anyway, the close is so small, I can't open the front of this new Stiebel Eltron 29 KW heater, as far as it could go, if the closet was bigger. The old Stiebel Eltron heater I removed has a front cover you can completely remove; this new 3rd generation heater has a hinged front cover. Please see my first image. Then, I discovered Stiebel Eltron design engineers could care less about upgrading an old Stiebel Eltron heater install to a 3rd generation heater. Why am I thinking that? Well because if you look closely a my second image, you'll see the wires are now too short to install properly in the new Stiebel Eltron 29 KW 3rd generation cabinet. So, you might be thinking why are the wires too short now? Well the Stiebel Eltron design engineers moved the wire terminal block to the upper right-hand area of the cabinet; in the old (1st generation) cabinet, the terminal blocks are at the bottom of the cabinet, where the wires enter the cabinet. So, as you can see from my second image, I've temporarily connected the wires to the terminal block, just so we can have hot water in the front older part of the house. TO-DO TASKS TO CORRECT SHORT WIRES: I have two options to remedy the too short wires: 1) run new wires from the 200 amps sub-panel or 2) lengthen the wires. The first option isn't going to happen; the front older part of the house does not have an attic. I ran the wires when we were remodeling the old part of the house years ago when Sheetrock was off the ceiling. There's no way I'm going to bust-out ceiling Sheetrock to run new wires. So, option two is what I have. My brother is an electrician; so, I'll get him to bring over his wire stretcher! LOL Actually, I've already purchased 6 feet of #6 AWG wire; I'll just cut that into three two-feet pieces and use #6 crimp butt connectors to attach the pieces to my too-short wires. THE NEW 3RD GENERATION HEATER PERFORMANCE: So, after all the installation bitchin' and shoutin', I gotta say this new Stiebel Eltron 29 KW 3rd generation heater is great! Our old 1st generation heater had only a Celsius temperature display; the new one displays Fahrenheit. Plus, this new heater produces much hotter water. Overall, I very pleased with the Stiebel Eltron quality. I'd just like to tell their design engineers a thing or two!!!! :-(
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Reviewed in the United States on October 3, 2018 by Blenda Huber
Size: 29 (kW)
Style: Tempra Plus
Started out rough with my Tempra 29 Plus. Hot water kept running out in the shower. Troubleshooting guide was no help that I could tell. Shower was starting out hot then getting cold. Then, while the valve was still set, I went and looked at the water heater and saw that, once I backed the shower valve off because it was too hot, there wasn't enough hot water flow to trigger the heater to work. I opened hot water to a sink as well as the running shower and the water got hot again. I realized that I had the temp on the water heater set too high (130 deg) so I backed it down to the label recommended temp range and it has been perfect since. Watch your settings.
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Reviewed in the United States on January 2, 2026 by bigtwin
Size: 29 (kW)
Style: Tempra Plus
I have two tankless water heaters in my 15 year old home, both of which were manufactured by Bosch. One of them recently stopped heating, and the other is working intermittently. I've replaced one so far with this Stiebel Eltron unit, and I have a second on order to replace the other. Replacement in my home was very easy since I already had the necessary plumbing and electrical supply in place. I selected this Tempra 29 Plus model largely because it requires the same electric supply as I already had in place (3 x 40 amp). It was a simple swap-out, taking only a couple of hours total. Operation is simplicity itself - the front panel displays the set temperature, and the dial control allows the temperature to be adjusted easily. I initially started at 120 F, reduced to 110 F after deciding that was a bit too hot for our kitchen and utility room use, and have now bumped it back to 115 F which seems to be a good temperature for our needs in that part of the house. (The second unit will service the other side of the house with our two bathrooms, and we may want to set the temperature differently there once we see what works best for providing comfortable hot showers). The quality of build is excellent, and I'm hopeful that "Made in Germany" will mean that it will be long lasting and reliable over time. I also have contacted Stiebel Eltron customer service once, calling them with a question regarding the setup of the unit. I was very quickly speaking to an actual knowledgeable person in their tech support group, who was helpful and considerate.
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Reviewed in the United States on October 29, 2023 by Phil in Magnolia
Size: 29 (kW)
Style: Tempra Plus
I really wanted to like this Stiebel Eltron Tempra Plus, but the reality has been incredibly frustrating. The biggest issue is how sensitive it is to flow. The only way I can get consistent hot water is by running a very high flow rate. If I try to take a normal shower with a standard shower head, the temperature fluctuates or doesn’t get hot enough at all. I literally have to crack open a second faucet (like the bathroom sink) just to keep the unit producing steady hot water — which is completely ridiculous. That defeats the whole purpose of efficiency and convenience. I shouldn’t have to waste water just to make a premium tankless heater function properly. On top of that, any low-flow fixture (which most modern homes have) makes performance worse. So you end up stuck between conserving water and actually getting hot water — and with this unit, you can’t really have both. Installation and build quality seem fine, but performance is what matters, and this just doesn’t deliver unless conditions are perfect. For the price, I expected something far more consistent and user-friendly. As it stands, I wouldn’t recommend it unless you’re running high-flow fixtures everywhere, which kind of defeats the purpose of going tankless in the first place.
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Reviewed in the United States on May 2, 2026 by Danielle Cinotti
Size: 29 (kW)
Style: Tempra Plus
there is no natural gas on our block and so we decided to go full electric tankless, hoping it would be enough for our 3 bedroom, 2.5 bathroom home. We love it when it comes to showers, appliances, kitchen and bathroom faucets. Life is uninterrupted on those fronts and we’re very happy with the unit. The two problems we’ve encountered are that our bathtub pressure went down quite a bit and with 2 messy kids we thought that was going to be a problem. We learned that if you turn the max temp down to 110 (we had it set to 125 at first) then there is more capacity at a very hot and comfortable temp. That helped split the difference on bathtub pressure. The other is that if you are running a bath, you will see a big decrease in pressure in the other hot water faucets in the house. So the adjustment was to not try to shower or do dishes while running a bath which is no big deal. And we don’t take two showers in different bathrooms at the same time. Otherwise, the unit is incredible. We are saving money on electricity each month since a tank has to stay hot 24/7 while this unit is only on when you turn on a hot water faucet or run an appliance. And there is great pressure and heat for all of our daily tasks under normal circumstances. Ultimately, the shower is great and we can do dishes and run appliances without a hitch. I would recommend purchasing this unit if you are ready for a minor quality of life adjustment for the energy and space benefits.
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Reviewed in the United States on May 26, 2023 by Michael Place