Stiebel Eltron Tempra 20 Plus (New 3rd Generation)

Dynamic Advanced Flow Control technology

Dynamic Flow Control Technology
exclusive to Tempra Plus tankless water heaters!

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internal view of the Stiebel Eltron Tempra 20 Plus tankless water heater
See an internal view of the Stiebel Eltron Tempra 20 Plus tankless water heater - learn how it works and what makes it superior to the competition.
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Stiebel Eltron Tempra Series Brochure
Stiebel Eltron Tempra Plus Series Brochure
(Adobe PDF)

Stiebel Eltron Tempra Series Electrical requirements & installation information
Electrical Requirements & Installation Information
Stiebel Eltron Tempra 20 Plus (White)
Stiebel Eltron Tempra 20 Plus (White) reviews
5.0 out of 5 stars (4 reviews)
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Stiebel Eltron Tempra 20 Plus (White)

MSRP: US$919
Our Reg. Price: $699
Sale Price: US$685.00
You save: $234.00

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  • Digital Display
  • Flow Control Technology
  • 19.2 kW's of Power
  • Thermostatically Controlled
  • Requires 125 Amp Service
The Stiebel Eltron Tempra 20 Plus, with a maximum power output of 19.2 KW, is designed for whole house applications in regions where the incoming water temperature is above 60F, and is therefore suitable as a whole house water heater in the southern U.S. and in some warmer northern climates. It is also a popular choice for summer use vacation properties in northern climates where the electrical service does not permit the installation of a larger model. It is also frequently used as a point-of-use heater where more demanding flow rates are required.

Like all Tempra Plus Series tankless water heaters, the Tempra 20 Plus features true microprocessor-controlled temperature regulation as well as a convenient digital temperature display and dial selector which allows you to set the desired output water temperature at any level between 86 and 140F (30 and 60C). It is one of the only tankless water heaters on the market that features a true thermostatic temperature control and full power-modulation based on both the incoming water temperature and the water flow rate. The Tempra 20 Plus will automatically adjust its power output to accommodate changes in the incoming water temperature and flow rate so it can precisely maintain the desired output temperature.

The Tempra 20 Plus also features Stiebel Eltron's exclusive dynamic Advanced Flow Control technology. This technology automatically adjusts the flow of water when the unit's sensors detect that the flow demand is exceeding the heater's capacity. This feature is particularly useful in cold climates and other applications where the electrical service size does not permit the installation of a larger model and it may be desirable to handle occasional high flow demands. It is also desirable where high output temperatures are required for temperature critical applications (commercial dishwashers, etc.) and where flow rates are not always predictable.

Simply stated, the Stiebel Eltron Tempra Plus Series electric tankless water heaters feature the most precise temperature control of any tankless water heater on the market today!

Maximum Flow Rate in Gallons Per Minute at 105°F Output temp
Incoming Water Temp: Flow Rate (GPM)
40°F 2.0 GPM
45°F 2.2 GPM
50°F 2.4 GPM
55°F 2.6 GPM
60°F 2.9 GPM
65°F 3.3 GPM
70°F 3.7 GPM
75°F 4.4 GPM
* This chart is based on 240v input.
Please review the Stiebel Eltron Tempra Brochure
for temp rise data at 208v input.
Do You Have Hard Water?
If your water hardness trends above 7 grains per gallon (GPG) or 120 mg/l (ppm), you should consider hard water treatment prior to your tankless water heater. If your hardness exceeds 12 GPG or 200 mg/l (ppm), hard water treatment is strongly recommended.

Hard water treatment helps maintain performance and efficiency, ensures optimal water flow and pressure, and protects your heater from pre-mature failure due to mineral build-up inside the heating module and other components.

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Stiebel Eltron Tempra 20 Plus Specifications
Yes, digital temperature control and full power modulation based on flow rate and incoming water temperature.
Advanced Flow
Control Technology?
Yes, dynamic flow control technology automatically adjusts the flow of water when the unit's sensors detect that the flow demand is exceeding the heater's capacity. This feature is exclusive to Stiebel Eltron Tempra Plus Series tankless water heaters!
Preset Temperature Memory Buttons: Yes
Flow Rate Monitor: Yes
Energy Monitor Showing Cost Savings: Yes
Hinged Case: Yes
Power (KW): 19.2 KW @ 240v / 14.4 KW @ 208v
Voltage: 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps: 80 AMPS @ 240v / 70 AMPS @ 208v
Breakers Required:*  2 x 40 AMP breakers (depends on local codes)
Wiring:*  Minimum 2 x #8 AWG Copper (depends on local codes)
Dimensions: 16.6 x 14.5 x 4.6" (42 x 36.8 x 11.7 cm)
Weight: 15.4 lbs (7.3 KG)
Pipe Fittings:  3/4" NPT
Energy Efficiency: 99%+
Activation Flow Rate: 0.50 GPM / 1.9 LPM
Max. Water Pressure: 150 psi (tested to 300 psi)
Max. Output Temperature: 140F (60C)
Max. Input Temperature: 131F (55C)
Warranty: 7 years against leakage / 3 years against defects in workmanship & materials
Safety: ETL Listed (US & Canada) - meets all applicable standards, including ANSI/UL 499 (USA) and CSA-E335-1/3E-94 (Canada)
Protection: microprocessor-based thermostatic temperature control (flow rate and temperature modulating) with thermal hi-limit cut-out switch monitoring each heating module
GTIN: 0094922100658

* Breaker size and wire gauge must meet all applicable local, state, provincial, and national electrical codes for your area - these are only guidelines that will apply to most installations. Some codes require use of electrical sub-panel for installation, especially when heater is not mounted within line-of-sight of the main electrical panel. Wiring should be sized to maintain a voltage drop of less than 3% under load. Please consult your electrician for more details.

Please note: A minimum 125 AMP household electrical service is highly recommended and will likely be required to install this model. If you are unsure of your electrical capacity in your home, please consult your electrician or contact us for assistance before ordering.

Stiebel Eltron Tempra 20 Plus (White) Reviews

Great Product5 stars
I use these tankless water heaters to replace old or failing water heaters in my apartments. I have ordered 7 so far (installed 5) and everyone loves them, especially me as it cuts down on my maintenance. E-tankless has been great to work with as well.


Waters Hot and Lots of It 5 stars
I turn on the water and I get hot water. There's little else to say. Completely satisfied!


Magic!5 stars
Works great and will even fill my bathtub. My house is 1620 SQFT and I live in Waskom, TX 75692. I have my temperature setting @ 111F.


Tankless Water Heater5 stars
Product works great.

ETL Listed - USA & Canada!
All Stiebel Eltron Tempra and Tempra Plus tankless water heaters are ETL Listed in the USA and Canada, ensuring they conform to all applicable safety standards.
WQA Certified - USA & Canada!
All Stiebel Eltron Tankless Water Heaters are tested and certified by WQA against NSF/ANSI 372 for "lead free" compliance.
Comprehensive 7 year manufacturer's warranty against leakage / 3 year against defects in workmanship & materials. See warranty for details

Stiebel Eltron is:
Stiebel Eltron is ISO-9001 Certified