The Rheem EcoSense Tankless Electric water heater is ideal for point of use applications providing continuous hot water on demand. The rugged brass/copper heat exchanger is designed to withstand the toughest water conditions and will heat water only when it is needed, eliminating costly stand-by heat loss. The light weight compact space saving design allows the unit to fit almost anywhere. The on unit temperature controls and LED's indicate active element and standby mode. Standard 1/2 inch water connections and power supply cord for wiring to electrical disconnect box allows for easy installation (240 volt hard wired electricity required) . Excellent option for remodeling and additions. Applications include, Homes, Apartments, Condos, Hospitals, Hotels, Boats, Restaurants, Offices, Laboratories, anywhere hot water is needed. Please click the "More Info" tab and then "Specifications" to view the Rheem Brochure Guide which will help you in your buying decision to ensure that you purchase the right tankless water heater model for your household needs.
(19 reviews) 19
88%of customersrecommend this product15 of 17reviews
Rating Breakdown19 reviews
Ease of installation
88%of customersrecommend this product15 of 17reviews
We have a small one bath, two sink cottage which had a huge water heater in my closet taking up space. My brother and friend (who are handy) installed this tankless system. It takes a new heavier wire to the electric box and some new pipe ends. I would hire it done unless you have done a lot of this work before. Installed this tankless is awesome! I have continuos hot water for my shower that stays constant. It is super hot for dish washing. Probably could not wash dishes and someone take a shower at same time on this small system. But it cleared up my closet space and I don't have to pay for heated water sitting around. I love it!
Pros: Reliable, Good Instructions, No Leaks, space saving
Cons: not for novice installation
8out of8found this review helpful.
Review 2 for On Demand 9kW 240 Volt Tankless Electric Water Heater
I installed this unit to provide hot water in my workshop sink. I was tired of washing my hands in 40 degree water. I am glad I got the 240V unit as I do not think the 120V unit would have been able to meet the challenge. I did not have any trouble installing it, but I know how to run water lines. If you have experience running water lines, you should not have any trouble. If not, you may be in for a challenge. I also already had a dedicated 240V outlet I could use. If you had to run the power yourself, it would have been more challenging.
12out of12found this review helpful.
Review 3 for On Demand 9kW 240 Volt Tankless Electric Water Heater
This is my opinion and my opinion only. I purchased this unit based on on-line reviews and company fact sheets. Both are confusing. If I had purchased the unit only for hot water in a sink, I probably would rate it five star for everything but installation, which requires that you work well with copper tubing. When I installed my unit, with the low temp setting I got cold water; with medium temp I got tempid water; and with the hot setting I got comfortably warm water. When I called Rheem about the problem I was rudely informed that I should have purchased the next higher unit or even the really big unit. I was also informed that if I tried to return the one I purchased, Rheem would not accept it. Rheem also refused to provide me with any technical help whatsoever. They would only provide it to the licensed professional plumber and electrician I had hired for the installation. To me this means that for a warranty on the unit I have to pay the purchase price for the unit and $500-700 to have it installed. And, for me, that means the only warranty this unit has is the 90 return policy from Home Depot.
75out of86found this review helpful.
Review 6 for On Demand 9kW 240 Volt Tankless Electric Water Heater
I have seen installed tankless water heaters that were over sized and over priced and installed 50 feet or more away from a faucet. This tankless does a great job of providing hot water quick without multiple circuit breakers. It is so small it can be installed under a sink so you get hot water in a few seconds instead of minutes.
8out of8found this review helpful.
Review 7 for On Demand 9kW 240 Volt Tankless Electric Water Heater
Works fine with plenty of hot water. Our usage consists of a small Kitchen and bathroom sink. Wouldn't recommend for anyone having a dishwasher or shower. I installed myself which took about four hours and a fair amount of know-how. Requires copper within 3 ft of unit. Had to route copper tubing to unit. Simple to wire - just used existing hot water tank circuit. The water could be a little hotter with unit turned all the way up but is satisfactory and about what I expected.
0out of0found this review helpful.
Review 8 for On Demand 9kW 240 Volt Tankless Electric Water Heater
Have connected to kitchen sink in my workshop. Turned to max, it heats water good at half flow. Above half flow, only will knock the chill off. Have to watch when running low flow as it will scald you.
4out of4found this review helpful.
Review 9 for On Demand 9kW 240 Volt Tankless Electric Water Heater
We research flow rates to make sure this would work for a shower in our shop but the water just gets warm. We are going to try and restrict the cold water into the shower so the hot water does not get cooled by it and see if that corrects the problem. The sink water gets hot if it is not turned all the way up but the shower is not working that way and I feel it is the flow rate
10out of13found this review helpful.
Review 10 for On Demand 9kW 240 Volt Tankless Electric Water Heater
I purchased this unit for my horse barn. It takes up very little space. It is not winter yet so can't say how it will work then but for now it is just what I need to bathe my horse. In the winter I will use it for drinking water.
0out of1found this review helpful.
Review 12 for On Demand 9kW 240 Volt Tankless Electric Water Heater
I am almost absurdly happy with my Rheem RTE-9. Of course I use it in a very limited situation--the master-bath lavatory sink that is around 30 pipe feet from the main water heater--and so I cannot speak to those who have more varied needs.
Before my son installed this point-of-use, tankless water heater (about two weeks ago), I had to wait over 2 1/2 minutes for the hot water faucet to deliver water that was slightly warm, and nearly 4 minutes for very warm water. This constituted a waste of over four gallons of water, which in these Texas drought conditions really bothered my conscience; in fact, I had taken to using only cold water to wash my hands and face, which feels pretty primitive, let me tell you, especially with cold weather coming on.
With this little Rheem jewel, installed in the cabinet beneath the sink, I get warm water in 5 seconds, and very warm water in 8 seconds. I even had to turn the temperature control down to medium so that the water wouldn't run too hot. This is a very efficient way to heat water in my opinion.
I've seen a few bad reviews of some Rheem models, but this one works like a dream. I believe I could hook the tub/shower line to it as well, except that I don't want to depend on electricity for my shower water. Here in Houston we sometimes lose power for days following hurricanes, so I prefer to rely on my main water heater (gas-powered) for that. (Ah, but here's a thought: I could put a diverter valve on the shower hot-water line, and in the case of a power failure, just switch to the main heater. Now, that would be very smart, I think; in fact, I'm going to ask my son to do exactly that!)
Note: my son says it's very important to follow the installation instructions--that is, use a 240 amp breaker and the right size wiring. Using insufficient wiring can trip you up, and I wouldn't be surprised if some bad reviews had their origin in that mistake.
7out of8found this review helpful.
Review 13 for On Demand 9kW 240 Volt Tankless Electric Water Heater
We bought a home in August with an older tankless which was leaking. This Rheem DOES heat in seconds, so you don't waste water. It is great for use on one hot water supply at a time, which we knew from reading specs and reviews. Had we wanted to install new electrical wiring, we might have purchased the next larger unit, as it was virtually the same price.
Pros: Reliable, Easy to Install, Good Instructions, No Leaks
Cons: can't use both baths at same time
3out of4found this review helpful.
Review 14 for On Demand 9kW 240 Volt Tankless Electric Water Heater
Have recently completed installation, which was more difficult than I originally thought, even though 220 power and water were in place as it replaced a tank water heater. Incoming water is very cold at this time of year. We are anxious to see if it handles our minimum requirements.
Pros: Good Instructions, No Leaks
Cons: Too Slow
1out of4found this review helpful.
Review 15 for On Demand 9kW 240 Volt Tankless Electric Water Heater
This unit works great for a utility sink in my work shop area. It delivers real hot water when using a lower flow, and is hot enough to mix with cold water to wash hands and clean up paint and spackle tools. I was limited on space, so this was a great fit. Also I only have a 100 amp service to the building and am limited to breaker spaces. The 9KW is the largest I could get. I have a short electrical run from the panel to the unit. It needs 1 DP 40 A breaker. The larger one need 2 double pole breakers. and the real big ones need 3 double pole breakers. If the faucet is turned all the way on it starts out hot but it will not keep up with the demand. I found that the temp dial must be turned up all the way to get real hot water. The flow is slightly restricted, so the hot water has less pressure than the cold. It is a perfect fit for my needs.
18out of46found this review helpful.
Review 16 for On Demand 9kW 240 Volt Tankless Electric Water Heater