Keeps temperature stable even when someone uses a faucet or flushes a toilet.
But when two showers are running, the temperature drops perceptibly. Which is more of a problem with the inferior 120V power grid in third world countries than this marvel of German engineering.

Installed June 2022

INSTALL NOTE - I am not a plumber and this stretched my mechanical DIY-er mentality, but I did install this on my own: be careful if you choose to install this on your own. I chose NOT to do the electrical upgrade required on my own - the risk of not getting that right was too high, so I paid my electrical contractor to upgrade the box for the 3 x 50 amp breakers - NO REGRETS!

I knew my 55 gal standard electric water heater was not going to last much longer due to the units age AND the fact our local city water is awful with calcium and build up. I researched the available setups and units ad nauseum, and went with this unit: the brand recognition and reputation, the size due to our house and expectation that we will eventually sell it. When I bought this unit, it was one of the larger of its type and was actually cheaper than if I went with a standard water heater to match the one I was getting rid of.

First, the drop in electric usage has about paid for 50% of the unit cost over the last year - yeah, THAT MUCH! Results will vary I am sure, but its just my wife and I in 2200 sq ft house, so the fact it runs "on demand" just makes sense. Another way to measure savings: I am all electric in this house and during extreme seasonal weather I could easily see a monthly electric bill $250-300, using either my heat pump or my additional heat source in the house. I have yet to see a monthly bill above $180 (Ohio weather from summer 90s down into the single digits in the winter).

The temp control is amazingly simply - we found 115 works fine and can take a long hot shower. But I can walk out and dial it up or down if I chose.

The install (outside of the electric) was not too bad. I have PEX plumbing in my house, so it was a no-brainer to use that with the majority of this project. I spent the money to buy heavy brass shot off valves (probably overkill) for the IN/OUT inlets on this unit. It will make a difference if I ever have to repair or replace the unit: I can easily isolate the unit from the flow of water.

Assuming we will move in the future, I will be looking for a house that either has a tankless or can be upgraded to tankless: its a great decision and works amazing.

We replaced an old 60-gallon water heater tank that was leaking and just about ready to burst with the Tempra 29. It is SO nice to reclaim that space in the boiler room and be able to actually get to the back area now without the giant tank in the way. We also already have solar panels, so this being electrical (versus our gas water heater) is definitely more sustainable.

However, we often have difficulties with the water getting ice cold at the kitchen and bathroom faucets. We'll turn it on at full heat, and it will get hot and stay hot for a while, and then randomly, out of nowhere, it'll get cold. If we keep running the faucet, within a minute or two it gets back hot again -- we tested it and saw that the unit does, in fact, shut off, during these times when the water gets cold. I'm not sure if this is due to flow rate (the bathroom faucet does run admittedly low), but if it were, then I feel like the water wouldn't get hot at all? Fortunately, we don't have this problem with the shower (although, ironically, we also can't run our full shower with all the body jets on because that's too *much* flow and the water doesn't get hot enough with them all on). I've given this 4 stars only because I'm not sure if this is due to the unit or if it's just a problem with our installation, electrical service, or flow rates. So I don't want to give this too low of a review since it's very likely it may not be the unit's fault.

It's also worth noting that although we have 200amp service in our house, this unit does kind of put us up towards the limit -- the lights always flicker very slightly when first turning on the hot water.

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

I was so impressed with the performance of this water heater. After installing, I tested by running 2 sinks and a shower at once. It kept up with water with no issues. We very rarely use that amount of water at once, but if we do, we'll be covered.

Not sure on longevity since it was just installed, but so far so good and we love it.