Stiebel Eltron 224199 240V Tankless Electric Water Heater

(10 customer reviews)


Digital temperature control. Voltage : 240 Volt or 208 Volt
Proven reliability
No venting required
Sleek design fits anywhere
Save at least 15-20% on the hot water portion of your electric bill

SKU: B081HPGRV7 Categories: , Tag:


Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole House Tankless Electric Water Heater, Advanced Flow Control

Stiebel Eltron - Simply the Best since 1924

Self-modulating energy technology & Advanced Flow Control for more comfort using less electricity

Sizing Guide

Temperature rise plus flow rate determines sizing
1 Find your approximate ground water temperature on the map.










Sufficient electrical service for largest models must be considered2 Check the column on the table to see how many fixtures can be supplied at the same time for each model.










Sufficient electrical service for largest models must be considered3 Use the actual max. flow rate to fine-tune these recommendations.










4 Make sure you have sufficient electrical service for the model.



Additional information


Tempra 15 Plus (Discontinued Model), Tempra 20 (Discontinued Model), Tempra 20 Plus (Discontinued Model), Tempra 24 Plus (Discontinued Model), Tempra 29 (Discontinued Model), Tempra 29 Plus (Discontinued Model), Tempra 36 (Discontinued Model), Tempra 36 Plus (Discontinued Model)


Item Weight

16.1 pounds

Product Dimensions


208 Volts


18000 watts

10 reviews for Stiebel Eltron 224199 240V Tankless Electric Water Heater

  1. JKrun

    This water heater is installed in a residence in the St Louis region. It supplies 2 full bathrooms, laundry, and kitchen. With a claw foot tub and a soaker tub, I have yet to hear any complaints of running out of hot water. It is very convenient to be able to set a precise temperature. I wish there was a way to hook up a remote. It was not able to maintain temperature while running two showers with temperatures outside below freezing. Will try again in the spring to see if the outside temp makes a difference.I installed it myself in about 4 hours. It is relatively easy to install if you are familiar with running water lines and electric.I would NOT recommend that you install this yourself unless you are very familiar with electric.Update 04/25/17- With air temperatures in the 60’s, I have been able to run two showers at once with adequate supply/heat. The second shower does receive a reduced pressure, however that is how the product is designed and is expected.Update 03/16/18- No issues to date.Update 02/24/19- No issues to date.

  2. BD Marsh

    Electric bill didn’t increase. 3 hot showers at once!Few tips -**Very important!! Make sure you have room in electric panel to add 3 double pole breakers and you have 300 amp service. Remember, you can swap out your old water heater breaker with 50 amp since you won’t be using it.Most homes will need 3 new power wires ran. 6/2, I bought 125ft. at Home Depot for $80.3 – 50amp breakers. $10 each at HD2 – stainless steel, braided water lines to connect unit. $15 each at HD (not required but very nice)Drain the tank on your old water heater before removing it. Much lighter and less mess.I installed this unit on a Sunday in about 4 hours and I’m slow. I replacement a 55 gallon tank heater. Pulling wires took most of time because there are 3 of them and they are pretty fat. Mounting and hook up was straight forward. There are many installation videos on YouTube that are helpful. Don’t even touch your electrical panel unless you have experience, electricity is an invisible assassin.Once fired up I set temp at 114 degrees. This is sufficient for my wife and daughter with their crazy hot showers. Didn’t notice a difference in time it takes for water to get hot at spout.Several months use, still no complaints.

  3. J. Monroe

    We bought this 1 year ago and installed it in our house in mid-New Hampshire. Our house runs on a well, and I was concerned that the cold (40 F) ground water would create a challenge for this water heater. I was wrong.I installed this Stiebel-Eltron Tempra 29 Plus to replace a propane powered water heater that the previous owner had used. Our home was wired for electric heat in the 1970’s, so it has a 200a service, and I wanted to avoid fossil fuels.We heat with 2 pellet stoves. We have back-up electric heat as well. I was concerned that the current draw for this unit would cause a problem with many electric appliances running at once. We didn’t have a problem, even when we had guests and multiple showers running at once. Plus, the winter of 2013 was quite cold here with some mornings as low as -15F, and still no problems.I would consider myself to have above average handyman skills. I installed this unit myself and had no problems at all. If you are comfortable replacing a circuit breaker, you can install the electrical portion of this, but I caution you, if you aren’t 100% confident, then hire a professional, because working near the bus in the breaker box can be dangerous, and 200a could probably cook you like a hot dog if your screwdriver slips. I have several years of experience working for an electrical contractor during the summers when I was a teen, so I felt comfortable taking on this project.I used shark bite fittings to plumb this unit. I got 2 valves to shut it off so it can be cleaned/flushed annually and I used 2 braided stainless steel connections to hook into the unit directly. I found these fittings on the shelf at Home depot. I also got the 8/2 wire at Home Depot. Total cost to install myself was ~$100 for wire (125 ft), ~$30 for 3 50a breakers, ~$60 for all sharkbite fittings. I had some other misc items on hand (screws, wire straps, tools, etc).My impressions of this unit over the year we have had it are very positive. There are some quirks, because this is not the type of system most of us are accustomed to as Americans. Contrary to the experience of another reviewer, I notice a slight, but noticeable increase in the temperature of the water when I’m in the shower and another tap is opened. It is not enough to scald, but it is occasionally uncomfortable. There is also a minor dimming of the lights when the water heater comes on. It does draw a lot of current, but not 150 amps. We have it set at 106F, which is the temperature I prefer in the shower. I can have the electric oven and range on, the microwave on, lights on around the house, the stoves going, and fill a pot with hot water in the kitchen. You won’t have problems hosting guests.My inlaws were concerned that we weren’t running the water hot enough to kill germs in the dishwasher and the clothes washer. I say hogwash. I haven’t gotten sick more often or noticed dirtier dishes or clothes. The water at their house burns my hands straight out of the faucet.My monthly electric bill with 2 people living in the house is somewhere around $100. It went as high as $150. last winter with stoves and humidifiers going, and as low as $80 this summer with no AC running. I don’t have previous bills to compare to since we installed this water heater as soon as we moved in.As always, YMMV, but I have been very pleased with this water heater. I probably could have gotten away with the unit one size down (tempra 24), but I like to do it once and do it right. The endless hot water and excellent efficiency are wonderful benefits, and we’ve had no significant drawbacks. If we ever move, I’ll get one of these for our new house.

  4. WZ

    After years of taking short showers and eventually increasing the size of the coil in our boiler with the hope of having it provide an acceptable reserve of domestic hot water we concluded that the only logical solution would be to replace the boiler at considerable expense. However, despite critical advice from local plumbers I went ahead and purchased a Tempura 12 and had it professionally installed at the boiler output using the boiler to preheat water for whole house distribution. I was limited to the Tempura 12 because we only have 100 Amp service. It was a leap of faith for sure but, despite the 12 being the lightest duty of the Tempra models it has has completely solved the problem by providing a constant supply of 120° water for a single family home with two bathrooms. We couldn’t be more pleased with the performance. The combined cost of the heater plus the professional installation was only a fraction of what it would have cost to replace the boiler. Based on my experience I can highly recommend the technology and Stiebel Elton products.

  5. c

    I just installed the Stiebel Eltron Tempra 29 Plus hot water heater and tested it at 110F degrees. It was able to run 2 showers and 3 faucets full blast with water pretty hot. I also tested the same at 115F and it was as hot as I’d want to touch. There was no reduction in flow. This little guy is great!Approximate Install Cost:1. Unit: $700 – I bought this in Sept 2017.2. Plumbing: $100 – I installed myself. Materials cost only. It took be about 5 hours.3. Electrical: $300 – Electrician installed 3 x 40 Amp breakers (total draw of device is 120 Amps max) in my box (which had space). My total house service is 200 Amps. It took him about 3 hours. I know the electrician through a mutual connection, so he might have given me a deal.

  6. Amazon Customer

    Purchased this product for a vacation home that was under renovations. The contractor did not install the unit until after the Amazon return window had passed. When he installed the unit, despite all efforts, we had no hot water and we assumed it was a faulty unit. Amazon had us contact Stiebel Eltron directly. The support from Stiebel Eltron went above and beyond. They spent hours on the phone with the contractor and my husband and even shipped us a new unit, no questions asked (and no additional charges). All of this happened even though they knew the problem was not with the unit, but with the plumbing or electric. When the new unit arrived, we still had no hot water. Again, they spent hours on the phone with our contractor trying to solve the problem. We now have plenty of hot water (the problems were not with the unit) and we can not say enough positive things about this company! True experts, who provide a solid product, stood behind their product and provided above and beyond customer support. I would work with Steibel Eltron again in a heartbeat

  7. Eric

    Bought the 36 plus model, did not fully grasp the scope of installation. This thing potentially sucks up 150 amps, you might only have 200 amp service to your house!! If you are reading this and considering the high end of any tankless model then figure in that much draw and become familiar with your breaker box, got room for 3 two pole breakers? Good. They come in slim versions to save space. If you pull the trigger on this or a equivalent one also plan on the cost of copper wire, you’ll be doing 3 runs of 6 gauge cable, my tank was right next to my breaker box and still cost me another ~150 bucks, if your distance to termination is farther get read to spend serious cash on wire.Now that you know what I found out, I just want to say if you’re in my situation and need to fill a 300 gallon jacuzzi over 100 feet from your heater, and have the water hot enough that you or ( in my case ) your wife can melt skin off then this is the best situation solver. All the bells and whistles, functions flawlessly. I do recommend you get the valves needed to isolate the unit, it is power ( lots of power.. ) next to water, play it safe.All told it works like a limitless water heater, and is great for large applications. Make the informed choice! Also probably go for the smallest one you can, because that wiring is hell.

  8. John Dey

    I have been using electric demand for of over 10 years. When my last unit failed after seven years of use I switch brands to Stiebel. The Steibel is a very well made. The quality is much better than the previous brand that I owned. The entire path that the water takes is made from copper. Setting the temperature is very simple and very accurate. I use a heat exchanger to pre-heat the cold water supply so my supply temperature can vary by 30 degrees F. The Stiebel is able to keep a constant output temperature. I have only used this for a few days but after the experience, I have with other brands the Stiebel is clearly better.After using the Stiebel for a few weeks, I am still very happy with this purchase. Two more comments; The unit is very quiet, you can only hear the water run through the pipes. It’s practically silent, and the flow sensor works with very low flow showers heads.

  9. J. Roberts

    Purchased the unit in April for our new to us home which had been stripped bare by vandals prior to our getting it. When deciding between a tank or the on demand, we went with the Stiebel.Installation was simple once we were able to get the line to the box from the breaker panel – it literally was a screwdriver only installation at that point.So far the unit has worked flawlessly (though if we max things out by running a lot of hot water at once) there is a bit of a pressure drop as the unit throttles down to compensate. We run a well (50psi max pressure) so I’m happy enough.Despite having its own dedicated line, I do notice an overall power dip when the hot water engages. Not enough to be a concern, but enough to notice. We run LED lights – it would be more noticeable with incandescent.I’m hoping for long term savings with this unit – my basement is damp, so a tank would tend to last about 5 years max where with care the Stiebel should last decades.*********************So its been over a year now, and I have some observations about how to maximize the savings with this beast.First, if you have a faucet that mixes your hot and cold water (as opposed to two separate knobs) you’re going to want to swap them out. Since the Stiebel doesn’t care if you’re running a small amount of hot water as opposed to opening it wide open, if you aren’t careful to ALWAYS run just the cold water, you’ll wind up engaging the hot even when it’s not needed whenever you go to wash your hands or rinse something in the sink. Yea, it may only be for 30 seconds, but multiply that over the course of a day then by the course of your electric bill cycle, and it adds up. We probably paid for the new faucets over the course of savings in just a few months.Second, compare your water bill rate to your electric bill rate. Odds are running an extra couple gallons of water will be far, far less than the electric rate running your heater. With that in mind, de-aerate your taps. The aerator is designed with a conventional hot water heater in mind, so by reducing water flow it conserves water that otherwise would be wasted. With an on demand system, you want to minimize the time needed to fill your sinks. Removing the aerator means that your flow is maximized, which reduces the time you’re burning electricity.Just by using these two simple steps, we cut our overall electric use by about a third compared to this time last year when we had the aerators on and the single faucet systems in place.One other observation – the instructions say ‘do not freeze’ – we had heating issues a few times over the winter up here in Maine and froze our unit up solid a couple times. It seems to have come out of the deep freeze without any noticeable problems. I wouldn’t recommend freezing your pipes, of course, but the system seems able to handle it.

  10. Scott Cold

    I recently installed solar on my home. I wanted to replace my 15 yo gas 50 gallon tank water heater. The electric option seemed an economical choice. I chose the Stiebel Eltron Tempra Plus because of its capacity to modulate the power used and the flow of water to maintain a constant temperature. One thing to note: do not purchase or install a unit larger than 2/3 of your house service capacity. My home service amperage is 150. So the largest amperage unit that I can install is 100 amps. The 24 kw unit was the best choice for my home. Another thing to keep in mind, the 24 kw unit requires two independent 50 amp 2-pole breakers to connect service to it. For my home, I didn’t have enough room to fit two 50 amp 2-pole breakers in my sub panel. Also for safety sake I wanted to have a 2 point disconnect to the Tempra Plus. I had a licensed electrician install a second 100 amp sub panel with the two 50 amp 2-pole breakers to provide service to the unit. I also had the city inspect the second sub panel and the water heater to record that it was installed to code. Its heating capacity fits my house perfectly. I have 3 showers and tubs in my home. If I run more than 2 at a time the hot water pressure drops significantly. However, we never run more than one at a time. A sink may be used at the same time as a shower. And there is no cold blast of water. The economy of this unit vs my old water heater: I spent an average of about $500 a year running my old water heater. My estimate of energy expense for this unit is $5 per year with solar. One more thing: if you want your tankless water heater to last more than a year or two then you’ll need to flush it with vinegar about every 6 months. To be able to do this, you’ll need to install service ports on intake and outlet ports. You can see examples of such service ports in my photos. I see photos of other installs, all without service ports. And then complaints that it suddenly stopped working after a year. Well tankless water heaters are not maintenance free. If you want to keep it working you have to descale it every 6 to 12 months depending on your water hardness. Or you have to have a water softener installed to get the calcium out of your water. Don’t forget the service ports!

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