Internet #300800822

Model #RETEX-36

Store SKU #1002624318

Performance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water Heater

  • Save money by heating water when you need it
  • Water heater equires 4 x 40 AMP double pole breakers
  • Same-day installation available. Call 1-855-400-2552
  • See More Details
$54900

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Price:
$54900

Product Overview

Designed to help reduce energy costs, this Self-Modulating Electric Tankless Water Heater is the perfect addition to your home. The continuous hot water allows for instant hot water on demand by heating water only when you need it. Easily control the temperature in 1 degree increments from 80 degrees to 140 degrees F.
  • California residents
  • Energy and cost savings: heats water only when it is needed for savings of up to 50% on water heating costs when used in a point-of-use application or 34% when used as a whole-home solution
  • Instant, continuous hot water: instantly provides ample hot water for up to 5 showers and 2 faucets (review selection guide below to confirm this water heater will provide the hot water needed based on your geographic location)
  • Space savings: small, compact design fits perfectly in tight places like under cabinets and sinks
  • Great investment and value: energy cost savings and a 5-year heat exchanger and 1-year parts limited warranty
  • Easy to adjust: electronic temperature control adjustable in 1-degree increments from 80-140 degrees F with easy-to-read display (Celsius and Fahrenheit compatible)
  • Easy installation: compatible with 3/4 in. water connectors for flex hose installation and no venting or T and P valve required for Easy installation (professional installation recommended)
  • Easy to maintain: durable, easy-to-replace heating elements
  • A reliable hot water solution from Rheem, the global leader in water heating
  • Before purchase and installation, please verify that you have the proper electrical requirements for your chosen heater
  • ETL Listed to UL-499 and CAN/CSA-C22.2 No. 64



  • Check out our buying guide on water heaters
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Info & Guides

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Performance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water Heater
Tempra 36 TrendSelf-Modulating 36 kW 7.03 GPM Compact Residential Electric Tankless Water Heater
BrandEcoSmartEcoSmartRheemStiebel Eltron
NameECO 18 Tankless Electric Water Heater 18 kW 240 VECO 36 Tankless Electric Water Heater 36 kW 240 VPerformance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water HeaterTempra 36 TrendSelf-Modulating 36 kW 7.03 GPM Compact Residential Electric Tankless Water Heater
Price
$35793
$54327
$54900
Add to Cart to See Price
Ratings
(1320)
(1320)
(881)
(4)
Flow Rate @ 45 F Rise (gallons/min)2.735.465.465.46
Indoor/OutdoorIndoorIndoorIndoorIndoor
Wattage (watts)18000360003600036000
Application TypeResidentialResidentialResidentialResidential
Water Heater FeaturesWall MountedWall MountedWall MountedOverheat Protection,Wall Mounted
Fuel TypeElectricElectricElectricElectric
Commercial/ResidentialResidentialResidentialResidentialResidential
View ProductView ProductView ProductView Product

Specifications

Dimensions

Product Depth (in.)
3.5
Product Height (in.)
18.25
Product Width (in.)
21.625
Water Connection Size (in.)
3/4 in. NPT

Details

Amperage (amps)
150
Application Type
Residential
Commercial/Residential
Residential
Electricity Phase
Single Phase
Finish Family
Gray
Flow Rate @ 35 F Rise (gallons/min)
7.03 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)
5.46
Flow Rate @ 55 F Rise (gallons/min)
4.47
Flow Rate @ 65 F Rise (gallons/min)
3.78
Fuel Type
Electric
Heat Exchanger Warranty
5 Year
Indoor/Outdoor
Indoor
Maximum Temperature (F)
140
Minimum Activation Rate (gpm)
.25
Minimum Temperature (F)
80
Number of Elements
4
Pack Size
1
Product Weight (lb.)
19
Required Volt Connection
240 volt
Returnable
180-Day
Uniform Energy Factor
0
Water Heater Features
Wall Mounted
Wattage (watts)
36000

Warranty / Certifications

Certifications and Listings
CSA Certified,ETL Listed,UL Listed
Labor Warranty
No Warranty
Part Warranty
1 Year

Questions & Answers

463Questions29Answers

Will this 27kw provide water for a bath, and a shower? two people live here

Asked by Philyoko October 17, 2020
2
Answers

Thank you for asking. Please contact us directly for assistance 877-474-6473.

Can you hook it to a water hose

Asked by Tara October 17, 2020
3
Answers

Thank you for asking. Please contact us directly for assistance 877-474-6473.

Can I mount this in a hallway closet or does it need to be in a garage or open area?

Asked by Jr October 17, 2020
4
Answers

Yes, you can install it in an interior space.

We have this water heater and when I am in the shower and someone gets in the guest shower, my sh...

Asked by VdZ October 13, 2020
5
Answers

It says 2.54 Gallons Per Minute. With 2 showers going you are probably using more water than that; therefore it does not heat water sufficiently at that flow rate.

Can this unit be placed in an unheated crawl space?

Asked by Willey October 13, 2020
1
Answer

Good day Willey and thank you for your question. The Rheem 36KW unit can be placed in an unheated crawl space as long as the temperature does not get below freezing (Causing the water to freeze and expanding in the heating chambers). Any freeze damage to the tankless water heater unit will automatically void warranty. If you have any other questions or any concerns, please contact our Rheem customer support at 800-374-8806. Thank you for your time.

What size compression connector does this unit use?

Asked by Bryang11 October 4, 2020
5
Answers

Compression connectors are not provided. You get 3/4" knockouts for electrical to use as you see fit.

I bought a 13 kg but it would not heat the bathtub water because we found out the water was coming in at 5 GPM.

Asked by KJ September 27, 2020
3
Answers

The answer is NO but it sounds like a typo. 5GPM is a lot to come out of a standard residential tap, up to 2GPM is more normal. The capabilities of these units depends on inlet water temp and flow rate. Charts are provided with this info.

What are the specs for the electrical connector for the RETEX-27 model? All the manual says is "E...

Asked by TomGet September 22, 2020
3
Answers

Thank you for asking. Please contact us directly for assistance 877-474-6473.

Can these be installed outside?

Asked by Kenney September 14, 2020
2
Answers

Thank you for asking. Please contacting us directly for assistance 877-474-6473.

Can i use only for baseboard heating only?

Asked by Ef10 September 14, 2020
1
Answer

Thank you for asking. Please contact us directly for assistance 877-474-6473.

Performance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water Heater - page 2

Customer Reviews

  • 892 Customer Reviews
  • 4.2 out of 5 stars overall
76% of customers recommended.
Overall Ratings
5star-icon(541)
4star-icon(170)
3star-icon(47)
2star-icon(25)
1star-icon(109)
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Recommended but installation is difficult
Quality :
4
Value :
5
Just finished installation. Unless you are very comfortable with plumbing mods and electrical installation, factor in a professional electrician and/or plumber to the cost of this unit. This unit (18Kw) requires two separate double 40 amp breakers since the unit draws 75 amps. My old tank water heater had one double breaker and I had no available slots in the breaker box, so I disconnected a hot tub that wasn't used much (I'll go back and add a box for that later). The most difficult part was that the manufacturer required 8 gauge wire for both circuits and my old unit used 10 gauge. I had 6 gauge laying around so I used that but I would have been better off going to HD and buying 8 gauge since the 6 was a bear to work with and requires huge conduit (see pic) - the wire I used also had an outer insulation with added to the size. Do yourself a favor and research "wire ampacity" so you can correctly calculate the wire gauge based on the distance from the breakers to the water heater. Distance makes a big difference in choosing the correct wire gauge. Since my circuit was only 20', I probably could have used smaller wire. This heater is working well so far (2 days) and heats as fast as my old tank, but I live on hot Florida where the water comes out of the tap at 78 degrees.
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3
0
Great Unit BUT Think through The Installation Before You Buy Your Parts!
Quality :
5
Value :
5
The unit (Rheem RETEX 13) itself is excellent! My installation took 7-8 hours longer than it should have because 2 separate Home Depots' "experts" sold me the wrong parts. They both tried real hard but they made it harder than it really is. With the right parts a DIY install should only take 3-4 hours and it isn't hard at all. Parts you'll need: a 60 Amp double pole breaker, 6/2 wire, (plus I recommend a cut off box), PVC conduit, a water purifier (makes your unit last longer), 2 pieces of 1/2" female thread to sharkbite flex hose (the ones you use for a sink) with shut off valves (for servicing your unit), 1/2" CPVC, a 1/2"elbow, 2 pieces adapter 3/4" male thread to 1/2" CPVC (for purifier), and whatever adapters you need to tie into your water in and out pipes. Tools you'll need; a flat head screwdriver (for connecting the wires), a small phillips head (for the unit's cover), level (make sure the input hose is level), wire cutters, PVC cleaner and glue (HD sells a kit with both), 2 pairs of pliers or open ended wrenches (to connect the flex hoses to the unit and the adapters to the purifier), a screw gun (to mount the unit and the cut off box), some pipe clamps (I recommend clamping your pipes to the wall, a handfull of screws, plumbers tape, and plumbers paste. Before you decide to buy one of these make sure your panel has enough power coming in to accommodate the unit. Install; (Turn off water main and main breaker before starting) I started by running my wire from the panel area to my garage where it was to be installed. Next I took the 2 small screws that hold the cover on, then used the included template and mounted the unit to the wall. I put a screw part way in above the top of the unit so it would not slide up and off the screws while I worked on it. Next I chose a spot for my cut off box and mounted it to the wall. (Do NOT install this below the unit.) Next I installed a 12" long 1/2 female flex hose with built in valve and sharkbite end to the water in and out on the unit. On the hot side (left) I connected a piece of 1/2" CPVC with a 1/2 to 3/4 adapter on it, then glued that piece to the 3/4 hot pipe that runs to my 2 showers, garden tub, 2 bathroom sinks, kitchen sink, washing machine, and utility sink. On the cold side I connected the already installed flex hose to a piece of 1/2" CPVC. On the purifier I had already installed a male threaded 3/4" to 1/2" converter on the in and out so I glued the 1/2" pipe to the output. From the purifier input I ran another piece of 1/2" CPVC to a 90 degree elbow, then another piece of 1/2" CPVC down to a 1/2" to 3/4" converter attached to my cold water in pipe. After allowing 3 hours (yeah overkill) for the glue to dry I turned the water main back on and water tested the unit until I was satisfied there were no leaks. Next I ran a piece of the 6/2 wire from the cut off box to the unit, then connected the wire from the panel to the cut off box. Back inside the house at the panel I removed the 30 Amp breaker from my old water heater. I connected the new wire to my 60 Amp breaker and installed it into the panel. Before turning the power back on I turned on the hot water on a nearby sink and let it run for a few minutes. It is VERY IMPORTANT to get the air out of the line. With the water still running I threw the main breaker, then the water heater breaker. No sparks, no smoke, everything looked OK. Then I went back to the garage, held in the button to turn on the unit, set it at 130 degrees, and went back inside. It took (and takes) about 1 minute for the heated water to reach the sink but once it does it goes from warm to hot very quickly. With everything up and running I re-installed the unit's cover. I have been using this for 2 weeks now with no issues. After failing to install with the parts that HD originally sold me I did call Rheem's customer service to verify the install I had in my mind would work. They were very helpful! The quotes I got to have a professional plumber and electrician do my install were insane. I'm all for paying a fair wage but paying someone's mortgage and car payment for 1-2 hours work just didn't fit the program. This is NOT a hard job, I would give it a 4 out of 10 difficulty. *I used a few more pieces that what I described because I had to keep piecing it together with the wrong parts
Was this helpful?
13
0
We have a two bedroom and one bath house and this hot water heater has no problem heating water f...
We have a two bedroom and one bath house and this hot water heater has no problem heating water for us. This was a very simple installation and it worked right away.
Was this helpful?
8
0
This tankless water heater is small in size but really...
This tankless water heater is small in size but really heats up our shower in a jiffy! No more waiting for hot water or worse yet, losing hot water during a shower. We love it.
Was this helpful?
5
0
Ran new 6/2 wire from the electrical box. New 60amp breaker. Flipped on the power and the LED say...
Ease of installation :
1
Quality :
1
Value :
1
Ran new 6/2 wire from the electrical box. New 60amp breaker. Flipped on the power and the LED says "OFF" "80 F". Pushing the dial doesn't turn it on. Rotating the dial doesn't turn it on. It is a dud. I am sorely disappointed and I can't return it because I am past the 90 day window. Buyer beware!
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12
0
I like it but 2 items to consider
Quality :
5
Value :
5
The product is easy to install but you do need 4 40 amp greasers and space for them in your panel. As long as you have the needed power the system works ok. I loved being able to get rid of my 50galon tank and have more storage space as my home is small. However two things I don’t like 1. The lights do flicker somewhat when hot water is being used which I can live with. 2. The hot water is not as constant as my tank system. I feel if I am in the shower and I have it at the right temperature if anyone uses hot water I have to readjust to get my hot water back. It’s a little odd getting used to it but if you are ok with that then you have endless hot water. I am currently building a new house and was going to go with a tankless system but now that I have experienced it my wife and I are rethinking this, we currently have a 2,000 sqft 3 full bathroom house and have the 36 kw system. Anything smaller will not work for us. It can crank out 140 degrees quickly which makes having multiple showers going possible.
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13
0
Heats plenty of volume for entire home at same time.
Quality :
5
Value :
5
Very simple to install, I am not a plumber and had no issues placing this into service, used ‘peck pipe’ & ‘ shark bite fittings’ yes a little more pricey , but saves time and mistakes are easily corrected. Heats up to 140 , plenty of hot water for just the 2 of us, but when guest are here, no one runs out. Super space saver..
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8
0
This unit was quite easy to install. I'd recommend the compression fittings as the FPT adapters ...
This unit was quite easy to install. I'd recommend the compression fittings as the FPT adapters require additional adapters and teflon tape and/or pipe dope, so it was easier to make adapters from copper pipe and have them be leak free. One thing worthy of note is that their tables showing faucet usage are off from what most kitchen or bathroom faucets will use. 1.5 GPM is really a small amount of water, and if you run at a higher rate, you won't get the temperature increase you expect. This led me to believe the unit was faulty, until I measured the GPM. Once adjusted to the 1-1.5GPM rate, the unit functions as expected. Nice to have an "endless" supply of hot water!
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7
0
We absolutely love the upgrade and added value to our home. However, I would recommend that you p...
We absolutely love the upgrade and added value to our home. However, I would recommend that you purchase the water heater yourself and find your own plumber and electrician rather than going through the "referral process" from Home Depot. The quote for plumbing the unit was nearly $1000, plus another $900 for the water heater and delivery charge (contrary to the store signage claiming free delivery with the purchase of a water heater). We would also have to contract our own electrician. In addition, the plumber recommended we buy a different brand which was not sold by Home Depot nor installed by him. Obviously did not want the business. We ended up ordering the water heater online instead of going through the store (saving us the $350 delivery charge), hiring our own plumber and electrician and had it installed for less than the quoted price from the recommended referral. Perhaps Home Depot needs to vet their "referral" companies and employees...
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14
0
The only reason I'm not giving it a perfect score is because we did not hook up all 4 connections...
The only reason I'm not giving it a perfect score is because we did not hook up all 4 connections therefore we're not getting the full affects of the unit. We plan on hooking up the other 2 soon. We bought it a few weeks ago. The instructions were not as detailed as I think they should have been. The instructions were not specific to the model we bought, but we general to cover all of the different models. I liked the easy programming.
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2
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