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.

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.

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.

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.

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!