Tempra 20 Plus Advanced Flow Control and Self-Modulating 19.2 kW 3.75 GPM Residential Electric Tankless Water Heater

I’ve had for about 2 months now and it’s been great!

We’re very happy we switched from a traditional tank water heater to the Stiebel Eltron Tempra 36 Plus. It is a high-quality unit with a compact design that saves space, and it has worked perfectly for our home.

This is a very high quality tankless system that is easy to install in and start up. It is important to consider that it will require three 220V breaker so space is required in your panel. Once installed it produced hot water immediately and since it could be located much closer to the demand vs a tank heater the hot water arrives much faster.

Very compact, cleans up the area without a big tank. Installed a few weeks ago and is working great.

I am somewhat or happy with our Stiebel Eltron Tempra 36 tankless heater. Not ecstatic, but mostly satisfied. On the positive side: Installation and plumbing is very straightforward and there is no giant tank to wrestle. You will never run out of hot water. You can precisely control the temperature. It takes up very little space. Maintenance is very easy - especially with a tankless valve kit. You are not paying to keep water hot during the time you are not using it. The not-so-great: Installation of the wiring can be a substantial cost if you are replacing a different type of heater. I had to add 3 new 50-amp breakers to my panel and run 3 separate sets of 8/2 conductors from the panel to the heater. Copper wire is not cheap. Just the materials added over $400 to the cost of my installation - most of the cost was copper wire. The recommendations on sizing are overly optimistic. We had to upgrade 2 sizes from what the sizing chart recommended. There is absolutely no way the recommended size would have worked for us. If you are considering one of these, go at least one size larger - maybe two. Low-flow appliances (e.g. dish washer) may not demand enough flow (.77 GPM on our model) to trigger the heater. Our dishwasher does not trigger the hot water heater. It's already on a fairly long run from the heater, so honestly it's not a big difference than what we had before, and dishwashers will heat their own water, but it's also possible you will need to remove high-efficiency aerators or other low-flow components from your plumbing - adding expense and causing you to use more water. Getting to target temperature on demand can take several seconds. If you had to wait for hot water with a tank, you will be waiting even longer with this one. Again, you will end up using more water than you would with a tank. When hot water demand increases, there is a period of several seconds where the water coming from the heater is colder than the set temperature. This is bad news if you are in the shower when someone else uses hot water - you will experience 5-10 seconds of colder water. When hot water demand decreases, there is a period of several seconds where the water coming from the heater is HOTTER than the set temperature. This is bad news if you are in the shower when someone else stops using hot water. If you don't have temperature-regulating shower fixtures, this is a bigger problem than you might think. With a normal hot water tank, the temperature leaving the tank never changes suddenly. Sometimes pressure changes, but almost all fixtures handle this gracefully and you don't get scalded or frozen when the pressure fluctuates. This heater cannot instantly compensate for changes in the flow rate - it takes several seconds - so any changes to the hot water demand will cause potentially a very substantial temperature change. Temperature regulating (sometimes called anti-scald) shower fixtures are not common in the US, and they are basically double the price of a normal pressure-regulating fixture. These fixtures are common (or even required) in Europe and some other countries. I called Stiebel Eltron tech support about this and they confirmed that it can take several seconds for the temperature to reach the set point after a change to the flow - so this is working as intended. I feel that Stiebel Eltron should include a temperature regulating mixing valve in their heaters for the US market, or at least offer an add-on kit with a mixing valve to address the temperature fluctuations - especially the case where the water can become too hot. I was really surprised that I did not find out about this until after installation. I did a lot of research before I bought ours, and this subject never came up. The result is that we have to be careful with our hot water use while someone is in the shower. Not because the heater can't handle the demand - it can - but rather because it can't maintain the set temperature perfectly when there is fluctuation in demand. Ours has been installed for about 6 weeks now. We really love the endless hot water and the precise temperature control. We're less in love with the rude temperature changes in the shower.

Got "Tempra 20 Plus" as a replacement for a similar electric tankless water heater. The installation was pretty smooth as this was a replacement unit, i.e. no drastic changes in electric box or plumbing was required. The pipes were bled after the installation (air is pushed out). The electrical box is 200A @240V. After the installation noticed that the GPM doesn't live up to the specification. Measured my inlet water temperature (from the basement sink) @ 40.5F. I will compare it with 39F values from the owner manual's reference sheet. Heating to 105F: Expected = 2.02 GPM, Actual = 1.7 GPM (-15%) Heating to 113F: Expected = 1.77 GPM, Actual = 1.5 GPM (-12%) Heating to 140F: Expected = 1.3 GPM, Actual = 1.1 GPM (-15%) Heating to 120F (my current setting): Actual = 1.5 GPM Another thing is I still have mixed feelings about Advanced flow feature (comes with Plus model). It limits flow to keep the target temperature. In reality, you usually mix hot water with the cold one to take a shower, so if someone washing dishes your shower will get colder anyways :) I think overall is good purchase, I believe this one will last long if properly maintained. Still proper GPM would make me feel better about my purchase.

So far so good. Hot water doesn't run out and gets hot pretty quickly. We are very happy with it.

Works great. Happy with the performance. Hope it’s as long lasting as reviews. Reported to be the best for the two breaker power supply.

Wery easy install if placed close to hydro panel. Make sure you panel will take the 6 breakers required. I used pex pipe and it was a simple install.

I purchased this unit because the HW heater in the house I currently live in was installed in 2014 and had started leaking. I had previous experience with a Stiebel Eltron unit that I installed in my last residence and everything was outstanding. A little note; I had to call support because I unplugged the door wiring and forgot which connection I had to use when I plugged it back in and was pleasantly surprised, I was on the call 1 minute and 42 seconds. That was my only call to support in over five years of using their products and was impressed. Over and above the fact that this unit will lower your electric bill; for complete satisfaction, ensure that you spec the proper size unit for your application.