Model # RETEX-36

Internet #300800822

Store SKU #1002624318

Rheem Performance 36 kw Self-Modulating 6 GPM Electric Tankless Water Heater
0020352685403

Rheem

Performance 36 kw Self-Modulating 6 GPM Electric Tankless Water Heater

  • Save money by heating water when you need it
  • Requires 4 x 40 AMP Double Pole Breakers
  • Call for an Installation Quote at 1-855-400-2552
$ 549 00
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Product Overview

  • Save money by heating water when you need it
  • Requires 4 x 40 AMP Double Pole Breakers
  • Call for an Installation Quote at 1-855-400-2552
Rheem Performance Tankless Electric Point-of-Use Water Heaters help reduce energy usage, save on energy costs, and are small so they will be a perfect match for installations under a cabinet or sink in your home, office, boat or RV. Plus, it's a great value with a 5-year heat exchanger and 1-year parts limited warranty.
  • 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° increments from 80°-140°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
  • Selection guide
  • Other models available:



  • Click here for more information on Electronic Recycling Programs
  • California residents see Prop 65 WARNINGS

Product Overview

  • Save money by heating water when you need it
  • Requires 4 x 40 AMP Double Pole Breakers
  • Call for an Installation Quote at 1-855-400-2552
Model #: RETEX-36
Sku #: 1002624318
Internet #: 300800822

Rheem Performance Tankless Electric Point-of-Use Water Heaters help reduce energy usage, save on energy costs, and are small so they will be a perfect match for installations under a cabinet or sink in your home, office, boat or RV. Plus, it's a great value with a 5-year heat exchanger and 1-year parts limited warranty.

  • 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° increments from 80°-140°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
  • Selection guide
  • Other models available:



  • Click here for more information on Electronic Recycling Programs
  • California residents see Prop 65 WARNINGS

Info & Guides

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Compare Similar

Compare Similar Products
Brand Rheem Rheem ATMOR Rheem
Name Performance 8 kW Self-Modulating 1.55 GPM Electric Tankless Water Heater Performance 11 kW Self-Modulating 1.97 GPM Electric Tankless Water Heater ThermoPro 24 kW / 240-Volt 4.6 GPM Stainless Steel Electric Tankless Water Heater with Self-Modulating Technology Performance 36 kw Self-Modulating 6 GPM Electric Tankless Water Heater
Price
$209.00
$259.00
Was $399.99
$339.99
Save $60.00 (15%)
$549.00
Ratings (32) (25) (59) (81)
Wattage (watts) 8000 11000 24000 36000
Water Heater Features Wall Mountable Wall Mountable Overheat Protection,Wall Mountable Wall Mountable
Flow Rate @ 45 F Rise (gallons/min) 1.21 1.67 gal (US)/min 3.6 5.46
View Product View Product View Product View Product

Specifications

Dimensions

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

Details

Amperage (amps)
150
Application Type
Residential
Electric Product Type
Residential
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
Product Weight (lb.)
19lb
Required Volt Connection
240 volt
Returnable
90-Day
Uniform Energy Factor
0
Water Heater Features
Wall Mountable
Wattage (watts)
36000
Wattage (watts)
36000

Warranty / Certifications

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

Specifications

Dimensions

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

Details

Amperage (amps)
150
Application Type
Residential
Electric Product Type
Residential
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
Product Weight (lb.)
19lb
Required Volt Connection
240 volt
Returnable
90-Day
Uniform Energy Factor
0
Water Heater Features
Wall Mountable
Wattage (watts)
36000
Wattage (watts)
36000

Warranty / Certifications

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

Questions & Answers

How many circuits and wht size breakers

Asked by: Sparky
36KW is 36000 watts. 36000 watts / 220 volts is 163 amps. You will need four 40 amp breakers to handle the load.
Answered by: Mike
Date published: 2019-03-28

Will it handle two showers, dishwasher and washing machine - not all at once:) Small 1,200 sq ft ...

Will it handle two showers, dishwasher and washing machine - not all at once:) Small 1,200 sq ft house with 2 special needs women.
Asked by: rosst
Hello Rosst. The 36KW tankless water heater will be able to handle all those fixtures at once if needed, but the temperature of incoming water can not be no less than 65°F. In order to get the maximum capacity from the 36KW unit, make sure that you have 240V and not 208V or 220V, even though the unit will still work on those voltages but the capacity will be derated by 25%. Please contact our technical support at 877-474-6473 if you have further questions. Thank you.
Answered by: Ecosmart
Date published: 2018-09-10

We have two hot water tanks, could 1 unit replace both?

Asked by: Kate
The 36 KW tankless water heater can handle anywhere from two showers to five showers at a time, depending on the temperature of incoming water and GPM flow rate of each shower head or fixture in your home. Yes the 36 KW tankless water heater can definitely replace two tank heaters. Keep in mind that the 36 KW tankless water heater requires a minimum of a 300 Amp service panel for the entire home, four double pole 40 Amp breakers, and four sets of 8/2 wire.If any questions or concerns, please feel free to contact our technical support at 877-474-6473. Thank you for your time.
Answered by: Ecosmart
Date published: 2018-09-10

how much to install this

Asked by: vvern
i do it free
Answered by: truck4ever
Date published: 2019-01-31
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Customer Reviews

Performance 36 kw Self-Modulating 6 GPM Electric Tankless Water Heater is rated 3.9 out of 5 by 78.
Rated 1 out of 5 by from The unit states to use with a 150 amp panel... The unit states to use with a 150 amp panel but when used it dims the lights in the house and consumes a lot more power than states. I would suggest that the instructions state that a sub panel be installed to actually run the unit. I am a Master electrician and have installed many of the tankless water heaters and have never seen one use power like this before, My customer was upset due to a increase in installation was over $1000 more than we estimated since we had to add a whole new panel off the side of the house panel and connect it to the meter to actually run the unit.
Date published: 2019-02-07
Rated 5 out of 5 by from Reliable, Effective Heater, DIY install Notes Key points: 1. More than sufficient capacity for a family of four in Roanoke, VA, even in Winter. 2. Handles 2 simultaneous showers with ease (probably more). 3. Self-installation was straightforward. 4. Accessories, in addition to the WH, for a typical install run over $250.00. 5. Needs 4 Double Pole 40 amp breakers and 4 runs of 8 gage wire (about $150.00 in parts). 6. I added Rheem Brass Service Valves Model# RTG20220AB ($90.09). 7. Works fine on our 200 amp service. 8. Even, predictable heating during showers/tub fills. 9. Takes 15 - 20 seconds to heat up to target temperature at faucets near the unit. Then, it will give you endless hot water. 10. Goes up to 140F. We keep it set at 115F with good results. 11. I selected the Rheem RETEX-36 over Rinnai and EcoSmart because Rheem was the only brand whose warranty applied to homeowner installations. 12. I chose electric over gas because 1) I wanted it located under the bathrooms, which happen to be far from exterior walls, making ventilation needed for a gas unit a challenge. 2) Electric on-demand is much less expensive to install than gas. 13. Tankless electric heaters are generally more efficient than gas water heaters; efficiency here means more of the input power ends up as hot water. However, gas is usually less expensive for the same BTU. I’ll update following the first bill to share how operating cost compares to the old 40 gallon gas unit. The nitty-gritty: I installed a Rheem 36Kw Electric Tankless water heater to replace an underperforming, worn-out 40 gallon gas unit that wasn’t able to keep up with the demands of our teenagers and two working parents. As other reviews state, when it is on, it uses a lot of power, to be expected with any larger capacity tankless water heater. This is a well-known trade-off. It is only on when hot water is running. It has an onboard computer that uses thermistors and flow sensors to modulate its power to its four heating elements. So, it draws more power if you are using more hot water. For example, one shower running at 2.5 GPM draws fewer amps than filling a tub at 6 GPM. Set at 115F (it can go up to 140F) it will full our garden tub at 5 GPM with no problems. The install was straightforward, but I am comfortable with plumbing and electrical. I had an electrician come by and verify before I installed since Rheem’s website suggests at least a 300amp panel. The electrician said he thought the unit would be fine, even with my electric heat pump and electric range. He was right, it works fine and after a month of use in Winter, we have yet to trip any breakers. As other reviews note, when it is heating, some lights in the house flicker a little. This is to be expected of any high-draw appliance. It is the same as when your heat pump/air conditioner first comes on, for example. It sustains with a tankless electric WH because the WH is drawing a lot of power while, and only while, hot water is running. I have found only my budget LED light fixtures are sensitive to flickering. My more expensive LED bulbs aren’t affected by flickering. BTW the flickering is subtle and not enough to bother us. A side-note: with the Rheem units, you can run them on any number of their four 40 amp breakers. If you run the RETEX-36 on three, instead of four breakers, it becomes equivalent to the RETEX-27 in power usage and in heating capacity/performance, and so on. Just make sure the first breaker is always on, it powers the unit’s brain. The RETEX-27 would have had plenty of capacity for my modest home, though I sprung for the 36 based on reassurance from the electrician and because I like the idea of filling the tub quickly when I want to. So, had the 36 tripped my main breaker, I’d have been able to either run it on three of the four breakers, OR return the RETEX-36 for a RETEX-27. Fortunately, it works fine. I added Rheem Brass Service Valves Model# RTG20220AB. It is an excellent, well-made product. The package includes the code-required relief valve. This add-on was well worth the added cost and serves a triple purpose. 1) Regular flushing is a must for longevity and reliability. 2) In VA, code requires hot and cold shutoff valves for water heaters. This unit has quality ball valves on the hot and cold side. 3) this unit has union joints that will make swapping out the water heater in the future a breeze. I hope the WH lasts a long time. But, let’s face it, like any high-power appliance, WH’s eventually wear out.
Date published: 2019-02-23
Rated 4 out of 5 by from Works great but requires a lot of power. Reduces power... Works great but requires a lot of power. Reduces power in other areas of the house while in operation. Have to upgrade my circuit box now
Date published: 2019-01-29
Rated 1 out of 5 by from Very bad customer care. Tankless water heater has had problems. The tankless heater want cut off.... Very bad customer care. Tankless water heater has had problems. The tankless heater want cut off. We have called customer service 6 times and they wanted to replace a part. We spent good money for this new unit. It takes 2 min to get hot water and the facet is 3 feet away from the water heater. Customer service says it should take 15 seconds. We have had nothing but problems.Have talked to Several rep.and no help yet. We spent good money for this and are being treated like we bought something used which we did not. We reviewed this unit and that's why we bought it because the reviews were great. But its just been problems it was installed. April 8 and now it's April 18 and outs still not fixed. We have only gotten the run around from Rheem.
Date published: 2019-04-18
Rated 5 out of 5 by from excellent product. I live in Oakland county so my well... excellent product. I live in Oakland county so my well water temp is around 45 degrees. it has no problem giving us continuous hot water. plumbers tried to talk me out of installing it because there is no venting or gas line involved. I am sort of handy so I watched the install video, good to go.
Date published: 2018-10-30
Rated 5 out of 5 by from This tankless water heater is better than expected. The supply of hot water is amazing. We're c... This tankless water heater is better than expected. The supply of hot water is amazing. We're considering replacement of our other hot water heater with another one of these.
Date published: 2019-04-09
Rated 3 out of 5 by from Easy to install. Gives great got water but I can not give 5 stars as my electric bill doubled so ... Easy to install. Gives great got water but I can not give 5 stars as my electric bill doubled so not worth the higher electric bill.
Date published: 2019-03-20
Rated 5 out of 5 by from I am happy is working fine.I will give you5 stars*****.I... I am happy is working fine.I will give you5 stars*****.I hope is going to go forThe next 10 YeRs.Tank you.
Date published: 2019-02-19
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