This is an absolutely amazing water heater. I replaced my propane tanked water heater with this. My dad and I installed it ourselves in about 3 hours including running new electric to the water heater closet, (he is a construction contractor by trade and knows how to do these things). But if you already have electricity to the installation site, (220. NOT 110), this is pretty straight forward and can easily be a DIY install.

On to performance. I was skeptical at first, having been told by a few plumbers that on-demand technology wasn't up to par. But after having numerous serious incidents with multiple, professionally installed, tanked heaters, and after some research, I decided to give this one a shot. I have to say that not only am I impressed, but was also shocked and highly satisfied with this machines performance. It produces hot water, on demand, limited only by your water supply. I have mine set at 116 degrees, (extremely easy to read/adjust the display/temperature), and we take showers back to back to back to back here now, and it doesn't even break a sweat. Excellent product!

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.

I understand how this install can get very expensive for people. We had help from a licensed electrician friend which saved us a ton. All in all install was under $500 after purchasing pipes, valves, breakers, wire, and conduit. Took about 6 hours, due to an extra trip to town for supplies. Hot water worked immediately. We did install a filter in front of the hot water heater to help reduce scale build up. The filter affected water pressure minimally. We have a 2000 Sqft house and a 200 amp electrical box. I have had no cold water sandwich problems. It does take a but for the water to heat up but this is a con I can live with for unlimited hot water. We've been using it for about a month now and I'm very happy with our purchase.

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.

We have really been enjoying our new hot water heater! We could barely get through a shower with our old electric 40 gallon tank. And then we'd have to wait a minimum of two hours to take another shower. Our girls could only have a quarter of the bathtub full and we were heating pots of water on the stove for them! The only downside to the tankless is there's a slightly longer wait time to get hot water and it takes 1 gallon per minute flow to activate the heater so if you're doing dishes, you have to keep it cranked all the way open. We are still learning and adjusting, but to have unlimited hot water Makes up for all of the downside! The location I installed this in the basement utility room is about 40 foot from the electrical panel so I will say the three runs of wire cost almost as much as the heater! Copper is ridiculous these days. I did install everything myself.