Tankless Water Heater Electric 11KW 240V, Designed for Domestic Hot Water Supply, Automatic Regulation of Hot Water On-Demand, Digital Temperature Display WN11

This unit is a perfect fit for my 3-bedroom/2-bathroom, 1500 square feet residence, effectively meeting the needs of the entire household. Set at 140°F, it can simultaneously handle two showers, with some extra hot water available for the bathroom sink or kitchen sink.If you have no knowledge of electrical work, do not attempt to install it yourself, as it requires a substantial amount of current to operate, needing 75 amps of power and (2x dual pole 40 amp breakers). Ensure that your electrical panel has sufficient space, as it requires five #8 wires to pass through a 3/4-inch conduit for power connection. If you have any doubts, please have it professionally installed, and make sure to read the required wire size. Compared to traditional bulky water tanks, it saves a significant amount of space.Overall, I am very satisfied with this device, especially since we have three children. Running the dishwasher, doing laundry, and taking showers can require a substantial amount of water for us, and our previous 50-gallon water heater couldn't keep up. This water heater performs exceptionally well, maintaining water temperature consistently. I hope this information is helpful for those considering purchasing such water heaters!

Sufficient water flow for the whole house! Quick installation & very useful remote temp control.

When my 2012 hot water on demand tank died, my plumber helped me to choose this replacement. I was skeptical that this would work, as he told me that they cost $1500 CAD. Well, it works well. If I have any problems with it, I'll update this review. The plumber cost $520 CAD, Electrician $700. At least the unit is the least expensive part of the equation.

0. Context:I bought this to replace a 20 year old traditional 40 gallon water heater that - while still works fine - can't keep up with a 15 minute shower in the winter. Ultimately it was an impulse purchase after a cold shower with little research of this branch or comparisons to competitive units. Typically I don't purchase things with limited reviews but I decided to roll the dice. I also typically don't review things when they work as expected but given the limited number of reviews on this product, I figured I'd take the time and hopefully it will be helpful to others.For reference, I have a ~1500 sqft home with 1 and a half baths (only one shower).1. Physical Size:First things first, it's MUCH smaller and lighter than I anticipated, almost flimsy. So much so that I immediately double checked on Amazon to make sure it wasn't just a point-of-use unit.2. installation:I installed this myself. I'm not unfamiliar with adding breakers and I monitor and am aware of my electrical load. These are things that make me comfortable, but not an expert and don't want to be considered as an example for others. Please be safe, water and electricity don't mix and neither do electricity and living.Attaching the unit to the wall is trivial, if you can hang a picture, you can mount this unit.The wiring and plumbing significantly depend on your unique situation, but for me was fairly straight forward as my existing water heater and breaker box were already next to each other. I used 8/2 wire and the wire, breakers, fittings, pex, etc. nearly cost as much as the water heater itself. Additionally, I already had the appropriate tools and such which would add to the expense. Just be sure to consider these extra costs.You will likely need to turn off the water at the meter for the plumbing and you should also turn off the main breaker on the panel when adding the breakers.3. Power Usage and Electrical Size:Despite it's small physical size, this unit (as I would expect any 27kw electrical thing) pulls A LOT of current. If you have less than a 200amp service to your house, I would not even consider a 27kw unit, or even a 24kw unit for that matter. I set the output temperature to 131* (140* is max) with the idea that "an oversized unit would have to work less hard for the same output" - however, when running, even set at 131*, it pulls a constant ~23kw, or roughly 95 amps.The max acceptable draw through a panel or breaker is typically considered 80% of it's value... so 32amps for a 40amp breaker, 160amps for a 200amp panel, etc. This unit actually breaks that rule of thumb, as 32*3 is only 96amps... although the list 113amps max is still below the listed 40*3=120amp capacity of the 3 breakers. All that said, even with a 200amp service to your house, going with the 80% rule of thumb, this unit pulls an actual 95amps at 131* (with 52* input temp and ~2.4gpm flow rate) which only leaves 65amps of best practice headroom for EVERYTHING else in your house, while this unit is running.NOTE: If you have, for example, a Tesla with a 48amp home charging set up... that, combined with this water heater at max draw (113amps)... JUST THESE TWO THINGS EXCEED the best practice 80% draw on a 200amp service... (48+113=161 > 200*0.8=160).... so you may not want to charge your car at max charging while also taking a shower at max temp.4. Geographical Location and Size:I am in the "light green" area of the map which suggests an average input temperature of 57*. However, measuring the cold water at the sink reads 52*... that said, it was 36* outside when measuring and running these tests. Being the coldest time of the year, I would consider this to be a "worst case scenario" in terms of geographically dependent unit sizing requirements. Taking a 25 minute shower (with a and with a 52* input temp and ~2.4gpm flow rate) as a test, with the unit set at 131* output temp and roughly 50-60 feet of through-crawlspace plumbing between the output of the unit and the shower head, subjectively the water was "hotter than comfortable" and cold water had to be mixed in to make it a comfortable temperature (and I prefer "hot" showers). While I haven't yet tried taking a shower AND doing a hot wash of laundry at the same time (for example), I feel that there's enough extra room to accommodate both at the same time... and again, I don't have the unit turned up all the way either.Trying to figure out how big of a unit I needed (per actual usage/effectiveness combined with the electrical capacity of the house) was the hardest thing to figure out when making this purchase.. and what doesn't help is that different competitive units of the same electrical size tend to be quite different in their advertised capacity.I erred on sizing up to the biggest size I would be comfortable putting on my already heavily loaded 200amp service panel at a financial cost that was palatable with the 52* ground water temp in mind. I figured I could easily turn down an oversized unit but with the installation differences being trivial (both in complexity and cost), I didn't want to end up with an undersized unit and cold showers to try to save $50-100.That said, knowing what I know now (with one day of testing, so still limited) 27kw is clearly bigger than I need. If/when I need to do this again, I will probably look for a 24kw unit or possibly even an 18kw unit. Especially since the ground water temp for most of the year in my area is closer to 70*.5. User Experience:Arguably the most important :) I tested my installation with a 25 minute shower (longer than the 40 gallon traditional unit that was replaced would comfortably allow) and it was fantastic! Plenty of hot water the ENTIRE time. I didn't notice any temperature fluctuations, but also the shower was the only thing running - so it is very accurate it it's ability to maintain a consistent temperature given a consistent flow rate. It will be interesting to do a load of laundry at the same time as showering to see how well it can handle variable flow rates.The biggest thing I didn't consider is that, unless you want the temperature to be different, there is ZERO temperature drift from the time you start the shower to the time you end it. Traditionally, as the hot water in the water heater tank gets replaced with cold water, the output temperature of the water slowly drops until it reaches the minimum temperature that the water flow across the heating elements can keep up with (generally when the shower "runs cold"). This leads to slowly inching the cold water in the mix to be less and less until the mixture is 100% hot and 0% cold (which is usually an indicator to me that it's time to get out of the shower)... that is totally a NON-ISSUE with this unit and it a total game changer.... it's such a minor thing but makes such a huge positive difference in the experience (at least for me personally).It's worth noting that this (or any other water heater) won't change the delay of the cold water in the pipes (between the unit and the faucet output) needing to be flushed before the water gets hot. There exist other solutions for that but just pointing that out for anyone who doesn't realize.6. Phone App:Unremarkable. It seems to work as intended but no more functionality than the screen on the unit (basically you can adjust the temperature and turn it on and off). I personally like the connectivity and it was one of the deciding factors for this unit.7. Recommendation:Definitely! I will update this review if I have future issues with this unit specifically but on-demand hot water is fantastic! I'm not an electrician so this is a personal thought, but I would say if you're a "normal" household with 200amp service, 27kw is really nice and unless your hot water needs are excessive, 27k is more than enough. Electrically, for me personally, I also have a pool, hot tub, sauna, electric car, plus electric heat, an electric stove, all other normal stuff (tv, computer, etc) plus also amp hungry tools such as welders, etc. so my household is very atypical and I will be closely monitoring the power draw via the Sense app.... so far my peak electrical usage with all that stuff prior to this water heater is ~26kw, but these are typically spikes rather than sustained usage. This unit can draw a sustained ~27kw.... the max my 200amp panel can support is 48kw on paper an 38.4kw in practice... obviously ~26kw + 27kw is more than my panel can support.... I am both aware and monitoring this... you should also if you're considering something like this.8. Final Thoughts:I didn't rate the tech support or energy efficiency because I didn't use the tech support and have only had it installed 1 day at the writing of this review... but at this point I will assume it will be more efficient and will update this review if otherwise.Thanks for reading my long review, hopefully it is helpful.Original Review ^^^^^^------------------------------------------------------------------------------------------UPDATE!!!!! (Dropped from 5 stars to 3 stars)After about a month of use, I've learned a couple of things....While I still REALLY like this unit, it's not quite living up to my expectations or initial impressions.We experienced some of the recent "Arctic blast", which dropped air temperatures down to the teens or single digits and the incoming water temperature down to a chilly ~44-45*f. According to the chart in the description, the 27kw unit should be able to run "two showers with 2gpm showerheads (rounded to the nearest whole number)" - which on it's own is kind of misleading and really fuzzy."Best case" might imply 2 showers at 2gpm, running only hot water, for 4gpm total flow. This is definitely not correct."Worst case" might imply 2 warm showers (101*f output) at a TOTAL flow rate of 4gpm (cold water included) which would be around a 65/35 hot/cold mix, making the *hot* water only flow rate only around 2.6gpm. Which would seem reasonable.With the heater set on an output temperature of 140*f (the max and increased since the initial installation), and at an input temperature of ~45*f and a flow rate of ~1.2gpm (the kitchen sink) the water heater was able to heat the water to a sink output temperature of 133*f - a super impressive, nearly 90* increase in temperature.However, if I wanted to fill the tub for a bath, at the same input temperature with a 3gpm flow rate, the output temperature at the tub spout only ever got to ~98*... which is fun for 90's music, but only lukewarm for a bath.So depending on how you read that chart and/or do the math, one tub does not equal two showers at a ~45*f input temperature. Disappointing.That said, the "fix" is to just fill the tub slowly (under 2gpm). Yes it will take 50% longer to fill, but it will be HOT.Unfortunately also, even with a single shower running at a 101*f output temperature (which is really just a warm shower, not a hot shower).... it's using ~1.3gpm of hot water.... so if any other appliance or sink or anything gets turned on, the output temperature drops to below 100* making for a cold to lukewarm shower :/All that said, that is with an input temperature in the mid 40*'s - which is absolutely my worse case scenario where I live, and I only have one shower anyway. I just originally thought that I had oversized my choice for the worst case and really, even at 27kw, it's still undersized.Additionally, after this month, I didn't see any reduction in my eclectic usage, so this doesn't save me any money there either.As negative as that sounded however, this unit is still mostly fantastic. As long as the shower is the ONLY thing running in the house, even with mid-40*f input water temperatures, it will produce a hot shower for as long as you can stand it which is a HUGE improvement over my old tank water heater that would only provide a 10 minute hot shower in the same conditions before going VERY cold.Furthermore, for me, this is the COLDEST it gets and only for brief periods of time (at most, less than a few weeks a year if it's a cold year). So I can tolerate this annoyance and once the ground water gets back up to 60*f+, I'm expecting these issues to be non-existent. But, I would not consider one of these units if your ground water gets any colder or stays in the 40*f's for large chunks of the year (unless you're using it as a point of use heater).Finally, as a personal preference, I'm highly considering adding a smaller 5-7 gallon tank style water heater to act as a buffer between the extreme cold/hot temperatures that this unit emits. For example, cooking food... you go to wash your hands, wait, water gets nicely hot.. finish and turn off the sink... 60 seconds later you need to rinse some vegetables, the water goes from warm to freezing cold and then there's a delay before it's hot again. Additionally, this would/should help eliminate periods of reduced heat in the shower if sinks are used or the washing machine is running at the same time as the shower.... but this is an extra expense and installation I didn't intend on doing.

Good system for a house with family of 5. Run 2 showers at the same time.Had installation questions and costumer support online was quick and responsive.If you have questions go to support online.