240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

These systems are amazing. The future is in your hand when you hold one. I fully recommend. Please, however read on to understand them better. Customer support is awesome and available. This 13kw unit worked in my home I went thru two of the 18kw units that would not work. Please read on. You will want one and never look back. These WH’s are complicated. They work awesome in the lab environment they were created in. If your home does not match that lab setting or you can’t recreate it. It will not work. I went thru three of them. YOU WILL NEED. Flow restrictions, preasesure regulators, water softener, filters(?), and a lot of patience tuning it to work. Once tuned however, they are flawlessly perfected at heating water instantly. Wow! the future is in these devices. Why was mine so difficult? I’m the last house from the power company. Literally at the end of the line. And I put in the 18kw unit. They are all super easy to install in both wiring and plumbing, but, what appeared to be my problem was there wasn’t enough physical energy to run it properly. Duel 40 amp req. So it wouldn’t work unless the flow restriction was almost closed. I tweeted and tweeted every possible measure to get it to work. I’m on well water so that incoming cold temperature affects the system and set up on a 40/60. The water rate It was moving was to fast and I never could get both sides of the water heater on. It just would NOT work. It would come on for a sink at half open but when you tried to shower. It would turn off and say E5. Oh how I grew to hate that display. A simple to read display and simple to adjust temperature dial. I literally went from Flintstones to The Jetsons in appearance. About this 13kw unit. WHICH SOLVED MY PROBLEM. It’s a little more than half the power necessary to function. Single 50 amp It is doing its job beautifully now. I have almost full water pressure again and it seems sold at 130 deg. But again, several hours spent tuning so it did work. If the flow rate is to high and water temperature to low it will not work. You have to tune them with additional devices to stabilize them so that units performance in the lab environment it was created in and it needs. I have replaced two tanks now. One electric in a home and one propane in a camper. Worth it!

If you can run the correct wire, this thing works great! I love it. I live by myself, but this thing runs my whole house. I dont necessarily try to over due it, but it runs the washing machine, the sink, and the shower. Maybe not necessarily all at the same time, but it does 2 of the 3 for sure. And there has been times when I was running all 3 at the same time, but it wasn't very long. Still did it though

We installed the Rheem 240V Heating Chamber RTEX-13 Tankless Water Heater, and it has completely transformed our buildings hot water system! Pros: Endless Hot Water: This unit provides a continuous supply of hot water, which is perfect for our busy buildings. No more waiting for a tank to refill! Energy Efficient: The on-demand heating means we only use energy when we need hot water, resulting in noticeable savings on our utility bills. Compact Design: Its compact size allows for easy installation in tight spaces, which is a major plus in our buildings. User-Friendly Controls: The digital temperature display and adjustable settings make it easy to customize the water temperature to everyone's liking. Reliable Performance: We’ve had no issues with temperature fluctuations, and it maintains a consistent flow even during peak usage times. Overall, we highly recommend the Rheem RTEX-13 for anyone looking to upgrade to a tankless water heater. It’s efficient, reliable, and has made a significant difference in our daily routine!

So I needed something that would give me constant and consistent Hot Water for the kitchen sink and the dishwasher. I wanted it accessible but not visible. After much research, I settled on the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater. After approximately one year of service use, I can say this has been a really good purchase so far. Produces hot water 'almost' instantaneously and keeps a pretty constant and stable temperature once its left running for a bit. If you start using hot water, then stop using it, and then start up abruptly again, you should be a little cautious because that second wave of hot water is going to be hotter than your original setpoint as the heater hasn't had enough time to dial back the temperature yet. But this isn't a problem with this unit, it's an issue with all these types of small electric water heaters. But even with this, it's a small issue and if you wait a few seconds then its no issue at all. Now I have noticed that in the last few months, it's taken a little longer for the water to get up to temperature. I think this has something to do with deposit buildup within the unit. I'll have to figure out how to flush it, which is usually standard maintenance for any water heating unit. But even now, that's a few extra seconds and then she's back to normal. We haven't had any real problems in the year we've used it. It keeps up really well with the new dishwasher we've bought too. All in all, this is a pretty good unit, and does its job very well.

Works very well. Replaced older model that did not have variable temp control. If you are in a cold climate, this will not keep up for high flow taps like your tub. However, living on a dug well in southern/central Ontario, this has been adequate as the main water heater. We have 2 low flow shower heads in one shower and you can turn both on and never run out of hot water. Not sure about energy savings as it is hard to calculate as I work weekly rotating shifts and my water usage is at different times of the day which equals different rates.

We did hire an electrician and a plumber to be on the safe side and to get it done quickly. This works with our 100 amp service as we are also efficient in our electrical needs and uses. We are only 2 in our household. Our kitchen sink is against a wall of the bathroom. In the bathroom we have a sink, tub with shower, toilet, and a front-loading washing machine which is energy efficient and we wash usually with cold water anyways. We found that we preferred to set the water temperature to 109 degrees F. It can be turned up to 140 degrees. It takes the same amount of time that our gas hot water tank had taken to warm up. But it stays even once it comes to the temperature it is set at. More even and does not run out and plenty hot enough at our setting. We forget we have it. It will pay for itself within a couple years and we save on water heating from 24/7 to only as needed or wanted. Love it!

Electrical current requirements are very high, this is a 13.8kw heater (requires a double 60 amp breaker). Think this through to insure you have the electrical capacity to supply the unit. Would highly recommend this product.

I purchased the 13kw unit to try out a low budget hydronic in floor heating system. I didn't have much room to work with so this unit worked perfectly. I'm only running just shy of 3gpm through it at 110 degrees f with an inlet to outlet difference of less than 20 degrees f so this thing is perfect. Happy with it so far, hopefully it holds up the way I'm using it.

Amazing little heater, we are using this in our cottage, takes about 30 seconds to get hot water a little longer if the lake water is really cold. Uses 40 amps of power at 125 degrees Fahrenheit