Rated 4.3 out of 5 by 243
Rated 5.0 out of 5.0 by Dock Why are traditional tank water heaters still being made?
I bought this to replace an old 40gal gas water heater. The thought process behind a tankless heater just makes so much more sense to me. This 13kw Rheem was so affordable I thought it was at least worth a try for my 3 bathroom ranch house in east Tennessee. If it turns out to not be able to keep up, I'll just add another 13kw unit either in tandem or at the opposite end of the house. So far this single one is working great though. Everyone who looks at it can't believe it actually works due to how tiny it is.
Installation was very easy. I do wish it had standard water heater 3/4" threaded fittings, rather than the 1/2" compression fittings. My house is plumbed with PEX so I had to be sure to have at least 3 feet of metal piping going in and out of the heater per the manufacturer's instructions. I also installed servicing valves on the cold and hot sides for future flushing needs. The valves should also make future servicing/replacement a breeze with the ability to isolate the water supply.
I also installed a non-fused 60amp disconnect next to the unit for added safety. This wasn't necessary given that the double 60amp breaker is within sight, I just did it as an added precaution. I tried to make an extended pigtail out of 6/2 wire (the pigtail it comes installed with is 8/2 wire) but the 6/2 was too big for me to get clamped down. I ended up with 8/2 from the heater to the disconnect and 6/2 from there to the breaker box. It is working fine.
Since I had the old 40gal unit that I was just going to scrap, I decided to gut it and plumb it in as a 40gal reservoir for the tankless unit to pull from. This set up is in my basement and I figured having the 40gal of basement temperature water to pull from would make for more predictable hot water temperatures than drawing from the supply at the street. Given that you can't set an output temperature on this unit (only a dial from low to high), I thought any variance in incoming water temperature that I could minimize would help make it a "set it and forget it" installation.
Anyway, I've been using this for about 3 weeks now and would definitely recommend it so far. I'll update this review if I every run into any problems.
February 25, 2015
Rated 5.0 out of 5.0 by DanN Install in-Line for optimal performance
I installed this unit in-line, so that I can use the tankless hot water heater or the existing gas heated water tank. I turn on the tankless heater, when only one or two persons are in the house or in the summer. I turn off the tankless and turn on the gas water tank when visitors are expected. The installation took about 20 minutes and only required a wrench, a screw driver and one additional copper pipe connector, Please see my photo of the installation to see how this works.
October 30, 2014
Rated 4.0 out of 5.0 by ArnoldSuttershire Super happy
Replaced my traditional tank water heater and saves us money on our electric bill. The water gets as hot as you need and gets hot FAST. My only complaint is the water temperature will occasionally fluctuate (losing heat) while taking a shower, but it's only a minor irritation.
August 28, 2014
Rated 5.0 out of 5.0 by Todd Excellent Product.
I have TWO of these installed so that I can get twice as much Instant Hot Water for my whole house anytime I want. The original manufacturer of this Design won a contest NASA Held for the Space Shuttle Program Water Heaters. The Company was in Florida and still exists today. I've had mine for 10 years, then had to replace one when the unit was clogged and I didn't catch it in time. I originally setup two so I'd have a backup if the other went down, (which will work fine if you do the piping properly). But since these are 1/2" inch input, you won't get tons of Hot water like you do when two of them are working! A Great Product! Easy to install, even easier to replace (If you ever need to!).
May 13, 2014
Rated 5.0 out of 5.0 by mb0075 Excellent Value
Not just a point of use water heater. I use this as my whole house water heater. For 1 or 2 person households in the south, it is an extremely inexpensive and space saving alternative to a conventional tank model water heater.You don't really want to take a shower while something else is using hot water, but I always felt that was true for a tank heater as well. I had to have my electric panel upgraded, which I paid a pro to do, but actually installing the heater isn't that difficult for an experienced do-it-yourselfer comfortable with plumbing and wiring. The best feature of the tankless heaters, in my opinion, is that the supply of hot water is unlimited. You need a long hot shower for a stiff back? No Problem. Two people need to take showers one right after the other? No Problem. Do a load of wash with hot water right after? No Problem. You never have to wait for that whole tank to heat again or finish a shower with cold water. Saves money with the electric bill, too.
January 14, 2014
Rated 4.0 out of 5.0 by themechanic4us great price for this product,lots of usable space after installation
The unit is small but powerful .After my wife and I installed the unit we had tons of space under are kitchen cabinet for extra pots and pans.This unit provides plenty of continuous hot water to kitchen sink witch is 2 feet away and bathroom fixtures witch are 20 feet away! It currently can raise the ground water temperature from 57.7 degrees ferenheight to 150 degrees ferenheight, The temperature adjustment knob is perfectly placed and clearly marked for user friendly changes. It may be wise to install anti scalding device if you have children and or elderly in the house hold. I did"nt do the math but I"am sure this unit will save me 10 to 20 dollars a month in electricity.
November 22, 2013
Rated 1.0 out of 5.0 by BobTheActor Be careful if you are using PEX or CPVC water pipe
If you are using PEX or PVC products, you may have a problem. Buried at the bottom of page 8 of the Use & Care Manual is this statement:
"Important: When using any type of plastic pipe like pex of CPVC you must install 36" of copper pipe to the inlet and outlet of the unit. Also, when using plastic pipe you must install a pressure relieve valve on the pipe for protection."
36" of copper pipe? That small size water heater now takes up a lot of room and special fittings.
There is no warning on the outside of the box or in any write-ups that I could find.
This caught me totally by surprise after planning the space for the heaters.
April 21, 2015
Rated 4.0 out of 5.0 by Otter Simple set up!
Plumbing this tankless heater was quite simple. Wiring it was more difficult. I needed to replace my double 30 amp. breaker with a double 60 amp. Use 6 gauge wire from the breaker to the 8 gauge wire coming out of the heater. A wiring diagram would have been very helpful.
I have 38 degree water coming in from a well and it heats it to 105 degrees fast.
February 1, 2014