Price: $292.05
(as of Dec 11, 2024 13:09:10 UTC - Details)

Professional classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications
External adjustable digital thermostatic control with LED display (+/1 degree accuracy
Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
54 A
Reviewer: Speed Global Services
Rating: 5.0 out of 5 stars
Title: Game Changer
Review: 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!

Reviewer: gcp
Rating: 5.0 out of 5 stars
Title: Works great - learn how to clean with no purge valves
Review: 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.

Reviewer: Kevin
Rating: 5.0 out of 5 stars
Title: Great product!
Review: What a space saver! I had to run new 8 gauge wire to box which was a pain but after doing that it was easy to set up!

Reviewer: Bob
Rating: 4.0 out of 5 stars
Title: Difficult Install
Review: Instructions are lousy. The cold inlet and hot outlet came with 1/2" Ferrel connections. Difficult to deal with. I installed a scale inhibitor filter and a service valve kit. For the life of me I cant figure out why they wouldn't use standard 1/2" male or female pipe threads. Electrical is a little squirrly too. Haven't fired it up yet sure hope it works OK. I struggled between this brand and one other and chose Rheem because of their reputation. Will update after I fire it up.Update:I was only giving it 3 stars because of the poor design for installation and lousy instructions, but the unit works so well that I raised it to 4 stars. The inlet and outlet fittings are coming out the sides making it bulky to install a service kit, but that's typical of all small tankless. They barely mention a service kit on the instructions possible because the units are fairly inexpensive and the cost to install the kit isn't worth it. If they would fix the plumbing connections and cut out the piece of plastic that hinders you from installing one of the 6 gauge wires this unit would be 5 stars.

Reviewer: Linda
Rating: 5.0 out of 5 stars
Title:
Review: 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!

Reviewer: Gboy
Rating: 5.0 out of 5 stars
Title:
Review: 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.

Reviewer: Jerami Brigden
Rating: 5.0 out of 5 stars
Title:
Review: 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.

Reviewer: Bill
Rating: 4.0 out of 5 stars
Title:
Review: 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.

Reviewer: Amazon Customer
Rating: 5.0 out of 5 stars
Title:
Review: Bon