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

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!

Installed this--my first--tankless water heater 3 years ago. Just my wife and I in a 2 bath home in south Florida (warmer entering water temp than most of US). Been very pleased. Endless hot water with steady temps and no issues with competing hot water demands such as dishwasher, sinks, etc. I've been surprisingly satisfied.A few weeks ago we started noticing a drop in water pressure and some temperature fluctuations. Honestly, though I am reasonably handy and experienced, I had no idea I should be cleaning the heater annually. Long story short - cleaned the unit and everything is back to normal.More detail for those who, like me, had the water heater installed without purge/diverter valves. I had only copper piping and no way to flush the heater. Read about some people who used a plumbing circuit involving a washing machine, but couldn't see that working for me. So, I went to Home Depot and spent about $170 on a purge valve kit, copper fittings, pipe, solder, flux, etc., ready to re-plumb my water heater and install purge valves. As I removed the compression fittings attaching the copper pipe to the heater I thought, "why don't I just attach hoses directly to the unit and skip all the plumbing?" That's what I did and it worked beautifully. In my case, I purchased 10' of clear plastic tubing, cut it in half and attached to the heater with band clamps. Used a 1/4hp pump in a 5 gallon bucket and flushed the tank for around 60 minutes. I changed the direction of the flow at about 30 minutes, not sure whether or not it helped but seemed a good idea.Returned almost everything I bought for the project, went home and took a nice long hot shower.

I bought the 13 KV model, it works great. Replaced a 52 gallon regular water heater and this tankless one works as good or better than the old one. It is small, about the size of a shoe box. I have a well, and water temp this time of year from the well is very cold but this unit does fine. Also with a well the water pressure varies a lot and is kind of low, 30 to 50 PSI, so you can only use one hot water source at a time. I have a big house, kitchen sink is about 70 feet from the water heater but water is very hot at the sink, it just takes awhile to get there. I had to make several adjustments to temp, as water was too hot, right now temp is set to 129, still a little too hot at times but works for doing dishes and pans in kitchen sink.The smaller units like mine, 13 KV, have 1/2 inch fine threaded inlet and outlet, but it comes with a 1/2 inch fine to coarse adapter. Also most hot water fittings and pipes are 3/4 inch, so you need to get an adapter if you have 3/4 inch pipes.Price was great too, $30 less than at HD for same unit.Unit requires number 6/2 wire, which is not cheap, plus a 60 amp breaker.Very happy with this tankless water heater, should have changed sooner.

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.

I already had a tankless hot water heater but it kept giving me issues and during the coldest month ever it completely stopped working. Thankfully I had already placed my order for this Rheem and it arrived as scheduled. Called my plumber and got it installed quickly and it works amazingly. 120 degrees is the recommended setting and it's perfect. I will never buy anything BUT Rheem again. I would highly recommend this product if you are looking for a tankless water heater.