High-Efficiency 8kW 240V Tankless Electric Water Heater by Rheem

Linda R.: This is our third Rheem small electric water heater. It is for an outdoor shower and a garage sink. The first one BLEW UP just out of warranty! Amazon asked them to replace it for us and they did. The second one lasted 8 years. When it gave up we went to Amazon to replace it and they recommended this newer product.
We bought it in Sept. 2023 and it stopped heating in late November 2023. When we finally were directed to the right people on the phone we were sent a15 page PDF and told to troubleshoot it ourselves and if the the Thermistors and Heating Elements were faulty they would send new parts and we would have to install them ourselves. The warranty on the heating element said 5 years but that do-it-yourself is NO Warranty at all! Three months! if they don't have people on the ground to work on them they should be refunded or replaced after such a short amount of time.

United States on Dec 01, 2023

Amazon Customer: I have a coal wood boiler, I have a indirect water heater and a domestic coil in it. 6-7 months out of the year I didn't need the tank water heater and I would just keep it on and feed the boilers hot water (makes 130-150 degree water). It no longer made sense to pay for the ridiculous cost to keep the old water heater in use. It is October and the boiler is off and I took a shower on a 1.25 gpm shower head, I could tell no difference. Water coming in is 55 degrees, however the ambience of the basement heats the 40 gallon indirect water heater and boiler at around 68. These slightly warmer temps help even if the system is off, factor that in to your equation.

Some advice
install a 1 micron water filter before the unit, these only fail because calcium or sediment cakes and cooks the unit. This is still a problem for tank heaters as calcium deposits will burn up heating elements in the tank units also. Hard water is significantly reduced by whole house filter, I have had my water tested before and after I installed them years ag0o. I have a 80 percent reduction in calcium and almost entirely reduced sediment. My solution is 5micron washable-5 micron...

United States on Oct 04, 2023

AmazonianAmazonian: Our Small bunkie at our cottage was updated and we installed this unit to replace a old school 40 gallon tank. The old tank took up some valuable space which once removed allowed us to expand our shower. The new unit is so small. I had it installed by a electrician and I did the plumbing which was easy. We have one vanity sink and one shower in the bunkie. I was a bit concerned that it wouldn’t give is the water temp we wanted but it actually works perfectly.
I bought this as a reconditioned unit from Amazon and saved some $, it was basically brand new in the box.

Canada on Aug 21, 2023

Sheri J Crowder: Easy to put in and works great!

United States on Jul 11, 2023

Amazon Customer: Installed this for a shower stall - low flow shower head. This unit is supposed to handle a shower no problem according to the Rheem website. Installed with a 40amp breaker / 8g wire as instructed and this unit cant keep up with a flow of more than 3 drops a minuet. If you like to shower with more than 3 drops a minuet, do not buy this. Ended up disconnecting this unit altogether. Complete waste of money.

Canada on Jun 23, 2023

Ken R: Only heats a trickle of water I can pee stronger than the heater can heat. If I turn tap up it doesn’t heat at all. When it does operate at a trickle it makes my led lights flicker in my shop and in my house which is 150’ away from shop. Returning it to Amazon

Canada on Mar 27, 2023

Tek: All of the documentation on this unit (8, 11, and 13 KW units) all specify that it has 1/2" compression fittings. That is INCORRECT! The heater has 5/8" compression. Yes, 5/8", the oddest size they could possibly put on it. It comes with 2 adapters which convert to 1/2" NPT... NOT COMPRESSION. So... You will need 1/2" FIP connectors.

Once installed, the heater works pretty well. Be sure you understand the ratings and capabilities tho. An 8KW heater isn't big enough to handle a shower, and barely handles a kitchen sink. It all depends on the incoming water temp, as these units typically can only raise the temp about 60F or so. So... if your water comes in at 55F which is very typical in much of the USA, then this heater really will only produce about 110F water. You also need to slow the flow. If you're putting this heater on something bigger than a bathroom sink, you will want to install flow control of some kind, and limit the flow to 1GPM or less.

With the cost of copper wire these days, people are trying to minimize cost, and in this case, may choose to install a heater that is really smaller than it should be. Just be aware that if...

United States on Jan 31, 2023

Avenue Shop Swap and Sell: Installation was easy. It's only been up and running for about 2 weeks, but so far it's working great.

Canada on Feb 02, 2022

Jn Cooking ChannelJn Cooking Channel: Did NOT work as presented in the description. I had this product installed as a dedicated single SHOWER water heater. It was positioned less than 24-inches from a single shower head. I chose the 240 volt version of a tankless heater thinking it would be more powerful when we had multiple guests who could shower without the delay caused by the home's 40-gallon tank heater, which needed an hour to recharge with hot water. What a waste of money, installation expenses and time for this tankless water heater.

I have had several Rheem tank heaters over many years that performed wonderfully, so I assumed I would get the same sterling experience in their tankless product. Major letdown.

Then, because of Covid-19 restrictions, I was unable to schedule an electrician or plumber to install this Rheem tankless water heater in Amazon's required time period to request a refund. Then Amazon promised a reply to my refund request in 48-hours and I never heard from Amazon again.

I tried cranking down the "hot water outflow valve" to the shower head as one user/purchaser recommended, but it resulted in a trickle flow of water that was useless for a...

Canada on Sep 12, 2021

T. ParryT. Parry: Great little water heater. I'm using it for a small studio apt. It's powering a shower, bathroom sink, and a kitchen sink. Word of warning: We thought there was a ghost in the wall because it would heat the water perfectly until the shower came on. Then it went to nothing. We did a ton of problem solving on this unit and were about to bust down the wall to make sure the shower was piped properly. Turned out that turning the output valve down to about half fixed all of our problems. You can either use a flow limiter OR just turn the output valve down.

Note: the 8w unit is BARELY enough to keep the shower going. It works, but can not heat water for anything else at the same time as the shower. If you can go for the slightly larger unit, I would highly suggest if you're doing much more than just powering a sink. I would have in retrospect, but would have to re-do the electric.

United States on Dec 07, 2020