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Model #Tempra 20 Plus

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Tempra 20 Plus Advanced Flow Control & Self-Modulating 20 kW 3.90 GPM Compact Residential Electric Tankless Water Heater

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  • Helps deliver steady water temperature in varying flow rates
  • Advanced Flow Control maintains the temperature by reducing flow
  • Self-modulating technology uses minimal energy to heat the water
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Product Overview

Powerful output, compact design, remarkable energy-saving features. Our whole house electric tankless water heaters perform with the highest standards for comfort and reliability. Tempra Plus models feature Advanced Flow Control, patented in Germany and exclusive to Stiebel Eltron tankless heaters. If hot water demand exceeds working capacity, Advanced Flow Control automatically maintains consistent temperatures by slightly reducing flow. Intelligent self-modulating technology continually ensures the least amount of energy is used to heat the water. A Tempra 20 Plus provides hot water at a consistent temperature for 1-2 bathrooms in warm climates, or 1 bathroom in cool climates. See sizing to determine which model is best for you. Stiebel Eltron invented tankless electric water heating technology more than 90 years ago, and is still the industry pioneer and world leader. Our engineering and manufacturing tradition of excellence means you can depend on the performance and reliability of our products.
  • Tempra tankless electric water heaters must be correctly sized and you should consult the sizing guide to determine the correct model for you
  • This Tempra Plus model has German patented Advanced Flow Control that automatically reduces output flow to maintain temperature if demand temporarily exceeds capacity
  • Requires a minimum of 125 Amp total service to the residence, with 2 separate dedicated 40 Amp DP breakers and 2 separate runs of 8-gauge copper wiring for the Tempra 20 Plus itself
  • Requires 240 Volt or 208 Volt electric service, and has a maximum output of 19,200 Watts at 240 Volts or 14,400 Watts at 208 Volts
  • Supplies endless hot water at a constant and steady temperature from 68 to 140°F (20-60°C) that can be set on the front panel digital display
  • Flow rate you achieve from this or any tankless water heater depends on how powerful the unit is and the temperature difference between the incoming cold water and the hot water being delivered
  • 99% efficient and typically result in savings of 15-20% in comparison with electric tank water heaters
  • Smart microprocessor technology unique to Tempra water heaters delivers steady water temperature even when flow rate vary as taps are adjusted
  • Must be installed vertically, water fittings pointing down, with detachable connections such as braided flex connectors to allow periodic filter cleaning and flushing for scale, and an anti-scale filter is recommended if hard water is present
  • Professional installation recommended



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Tempra 20 Plus Advanced Flow Control & Self-Modulating 20 kW 3.90 GPM Compact Residential Electric Tankless Water Heater
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BrandStiebel EltronStiebel EltronStiebel EltronStiebel Eltron
NameTempra 20 Plus Advanced Flow Control & Self-Modulating 20 kW 3.90 GPM Compact Residential Electric Tankless Water HeaterTempra 29 Trend Self-Modulating 28.8 kW 5.66 GPM Compact Residential Electric Tankless Water HeaterTempra 24 Plus Adv Flow Control and Self-Modulating 24 kW 4.68 GPM Residential Electric Tankless Water HeaterTempra 29 Plus Adv Flow Control and Self-Modulating 28.8 kW 5.66 GPM Residential Electric Tankless Water Heater
Price
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$79900
Ratings
(138)
(45)
(141)
(143)
Wattage (watts)19200 W28800 W24000 W28800 W
Number of Showers1-21-21-21-2
Application TypeResidentialResidentialResidentialResidential
Indoor/OutdoorIndoorIndoorIndoorIndoor
Flow Rate @ 45°F Rise (gallons/min)2.91 gal (US)/min4.37 gal (US)/min3.64 gal (US)/min4.37 gal (US)/min
Water Heater FeaturesOverheat Protection,Wall MountedOverheat Protection,Wall MountedOverheat Protection,Wall MountedOverheat Protection,Wall Mounted
Fuel TypeElectricElectricElectricElectric
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Specifications

Dimensions

Product Depth (in.)
4.625 in
Product Height (in.)
14.5 in
Product Width (in.)
16.625 in
Water Connection Size (in.)
3/4 in NPT

Details

Amperage (amps)
80 A
Application Type
Residential
Commercial/Residential
Residential
Electricity Phase
Single Phase
Finish Family
White
Flow Rate @ 35°F Rise (gallons/min)
3.75 gal (US)/min
Flow Rate @ 45°F Rise (gallons/min)
2.91 gal (US)/min
Flow Rate @ 55°F Rise (gallons/min)
2.38 gal (US)/min
Flow Rate @ 65°F Rise (gallons/min)
2.02 gal (US)/min
Fuel Type
Electric
Heat Exchanger Warranty
7 Year
Hub Required
No hub connection available
Indoor/Outdoor
Indoor
Maximum Temperature (F)
140 °F
Minimum Activation Rate (gpm)
0.5
Minimum Temperature (F)
68 °F
Number of Elements
2
Number of Showers
1-2
Pack Size
1
Power Options
Hardwired
Product Weight (lb.)
16.1 lb
Remote Access
No Remote Access
Required Volt Connection
240 volt
Returnable
90-Day
Uniform Energy Factor
0
Voice Control Hub Required
No Voice Control
Water Heater Features
Overheat Protection,Wall Mounted
Wattage (watts)
19200 W
Works With
No additional compatibility

Warranty / Certifications

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

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.7
    out of 138 reviews
  • 90%recommend this product
Filter by:
Showing 1-10 of 138 reviews
Love my new tankless water heater. My previous tankless...
Love my new tankless water heater. My previous tankless took 5-8 minutes to get water hot. Now it's less than a minute anywhere in the house.
by
Response from Stiebel Eltron SupportDec 19, 2021
Thank you for your excellent review! Enjoy the hot water!! JGMasterSTELogin
    Handled The Game Crowd
    Installation of the unit was very easy. Vendor support line was OUTSTANDING. Unit was able to provide hot water for 7 showers prior to College Game Day and Sunday "recovery".
    by
    Response from Stiebel Eltron SupportSep 22, 2021
    Thank you for your excellent review!! JGMasterSTELogin
      • Recommended
      This tankless water heater provides a good hot water flow but does not takes up little space.
      This tankless water heater provides a good hot water flow but does not takes up little space.
      by
      Response from Stiebel Eltron SupportJun 3, 2021
      Thank you for your excellent review! JGMasterSTELogin
      • Verified Purchase
      • Recommended
      Beautiful hot water in Pittsburgh PA End cold suffering
      Why did I wait so long to get one endless hot water the size of a suitcase. Go tankless asap & stop the wait for hot water. Saves energy too
      by
      Response from Stiebel Eltron SupportMar 3, 2021
      Thank you for your excellent review! Enjoy the hot water for years to come!! JGMasterSTELogin
        • Recommended
        2 people found this helpful
        Smart choice in the right application (Tempra Plus 15)
        I installed this unit in August of 2019 (one year ago) and it is one of the best investments I've made since purchasing my condo. This unit replaced a 30 gallon electric tank water heater from the early 1990's which was not providing enough hot water for a bath or for two people to take showers. The tank had not been maintained so there was significant sediment which degraded the performance. The tank was installed in a cabinet near the breaker panel. The tank was a very tight fit--it's doubtful the anode was ever replaced as there was no headspace. After researching tankless units and consulting an electrician this model was the one recommended and for my application is the best solution. Our winter water temperature is 42 degrees F (southern Minnesota) and I had a limit to the electrical load so this unit is the largest I could install with those restrictions. From the photo you can see I am also limited to a small cabinet that used to hold the 30 gallon tank heater. This installation is in a condo with four fixtures that use hot water: a kitchen sink, lavatory sink, dishwasher, and shower/tub. This application has very short pipe runs--there is no recirculation pump for hot water or pipes inside exterior walls. The most difficult task was finding a plumber to install it--I called four reputable local ones and while their websites sold tankless units, the plumbers dispatched to estimate the job were all more keen to install a tank. I had to do a lot of research and speak with my local inspector to confirm that this could be installed; I found those with experience with tankless units (the inspector, electrician, and one plumber) knew a lot more about installation than those that just stuck to tank-type installations (the rest of the plumbers). Specific to the Stiebel Eltron Tempra 15 Plus--the "Plus" is necessary as it has a valve to regulate flow to maintain temperature and is unique to this brand. The installation and instruction booklet were well written, the unit has a clean appearance, and controls are simple to use. I do wish this had a remote display as it would be helpful to see the flow statistics from a better angle but I am limited to seeing the display where the unit is installed (inside a high cabinet). The interior construction is solid (a lot of copper) and straightforward--my electrician had no problem connecting it and it powered up right away. As for use, the water in a nearby faucet takes about 30-45 seconds to flow at the setpoint of 116F which is similar to what the tank unit performed at. Because the unit is tankless, there is no limit to the quantity of heated water. The unit is silent but in the winter if I'm filling the bathtub I can faintly hear the valve regulate the flow to maintain the outlet temperature of 116F I have the unit set to. The cabinet where the unit is installed has plenty of room to leave a flush kit in it and already had a drain (PVC pipe to vertical stack) from the former heater's TPR valve which the drain pan was plumbed onto. A big word of caution is that proper sizing a tankless unit is critical to your application and lifestyle--this unit is ideal for my application but in a house with several lavatories or a clothes washer it would be underpowered. I provided the electrician I hired with the spec sheet for this unit and he confirmed it would serve my needs--the vendor can also offer help in selecting the right unit. Tank-type units are more common in the U.S., often a little cheaper, and are simpler devices--since most homes come with one installed it's an easy choice to swap out one item that worked with a similar one--but in some applications a tankless unit is a smarter replacement. I don't have the measuring equipment in my home to see if this unit is saving me electricity over the 30-gallon tank unit--I haven't seen my electric bill go down significantly--this could be my usage habits as I no longer need to be concerned about running out of hot water.
        by
        Response from Stiebel Eltron SupportSep 24, 2020
        Thank you for your excellent review! This will answer many questions for the people thinking of installing our units! JGMasterSTELogin
          • Recommended
          11 people found this helpful
          Installed myself...it was easy...there are videos on YouTube if your not sure..this unit works Gr...
          Installed myself...it was easy...there are videos on YouTube if your not sure..this unit works Great...we have used for 3weeks now..zero issues..the kitchen is about 45'away and master bath is about 65' away and we had kitchen sink going, dishwasher going and master bath going and had plenty of hot water!!!..make sure to install flush valves on the unit so you can clean it once a year..there are videos on YouTube for that as well..just search flush tankless water heater...or install if you want to see those videos..Great product...well made!!!..I added an additional water filter just because ..you don't have to do that as the unit already has a filter built into it....but I just wanted to!!!...highly recommend..they have the best warranty as well !!
          by
          Response from Stiebel Eltron SupportJul 22, 2020
          Thank you for your excellent review!!! JGMasterSTELogin
          • Verified Purchase
          • Recommended
          9 people found this helpful
          Works really well. Run two showers at once and definitely keeps up. I am located in south Texas s...
          Works really well. Run two showers at once and definitely keeps up. I am located in south Texas so water temps are 75 and above. Is a German made water heater which was populate prior to being in tankless heaters coming to the states. Well built easy install. Need two double pole 50 amp breakers and 8/2 wire for install. Love it so far.
          by
          Response from Stiebel Eltron SupportJun 15, 2020
          Thank you for your great review!! JGMasterSTELogin
          • Verified Purchase
          • Recommended
          6 people found this helpful
          Easy install, so far so good!
          Easy install, so far so good!
          by
          Response from Stiebel Eltron SupportMay 18, 2020
          Thank you for your review! JGMasterSTELogin
          • Verified Purchase
          • Recommended
          2 people found this helpful
          We have had this installed for over a year now to provide hot water to one shower and two sinks (...
          We have had this installed for over a year now to provide hot water to one shower and two sinks (bathroom and kitchen). Great space saver compared to a lowboy 30gal hot water heater. It has worked flawlessly and the heat adjustment knob is awesome. Doesn’t take long to start having hot water. You do need a 50amp breaker with this unit in your panel. Thinking about replacing our 50gal tank with another one of these.
          by
          Response from Stiebel Eltron SupportNov 25, 2019
          Thanks for the great review! JGMasterSTELogin
            • Recommended
            2 people found this helpful
            Easy to install IF you have the proper electrical capacity...
            Easy to install IF you have the proper electrical capacity available. This takes two (2) 8/2 cables connected to four (4) 50amp breakers. Has worked flawlessly after being installed for a week.
            by
            Response from Stiebel Eltron SupportJan 13, 2022
            Thank you for your excellent review! Great tips too.. JGMasterSTELogin
              Showing 1-10 of 138 reviews