Stiebel Eltron Tempra Series Tankless Water Heaters

Stiebel Eltron Tempra tankless water heater The Stiebel Eltron Tempra Series electric tankless water heaters are the most sophisticated thermostatically-controlled on demand, instantaneous water heaters available on the market today.

Stiebel Eltron Tempra Series offers models ranging from 12 to 36 KW in power, to meet a wide range of point-of-use, whole house, as well as commercial applications. Each model features Stiebel Eltron's advanced microprocessor technology which constantly monitors the water flow rate and incoming water temperature and adjusts the power level to maintain a precise output temperature as selected by the user.

A simple adjustment dial on the front of the heater allows you to set the output water temperature to whatever temperature you desire between 86 and 140F (30 to 60C)[Note, maximum temperature setting on some models is 125F (52C)]. To learn more about what makes Stiebel Eltron tankless heaters superior to its competition, visit our comparison of tankless water heater technologies page.

Selecting a model for your application is largely dependent on your incoming water temperature, flow rate requirements, and what features you desire. Please view our Tankless Water Heater Model Selector Page for proper sizing information. The specifications of each Stiebel Eltron tankless water heater model is noted in the chart below - click on the name of the heater for more details.

Stiebel Eltron tankless water heaters are designed to completely replace a conventional hot water tank.

Stiebel Eltron Tempra Series Specifications

Tempra 36 Tempra 29 Tempra 24 Tempra 20 Tempra 15 Tempra 12
Application Extreme North and/or Very High Flow Rates Northern Regions or High Flow Rates Northern USA or Higher Flow Rates Southern USA / Moderate Flow Rates Tropical /
Tropical /
Temp Control Full micro-processor-based thermostatic temperature control featuring digital temperature selector /
display and full power modulation based on flow rate and incoming water temperature.
Digital Temp. Setting Display No
Hinged Case Yes
(KW's @ 240v)
36 KW 28.8 KW 24 KW 19.2 KW 14.4 KW 12 KW
(KW's @ 208v)
27 KW 21.6 KW 18 KW 14.4 KW 10.8 KW 9 KW
Max Temp Rise @ 1.5 GPM
240v (208v)
92 F (92F) 92 F (92F) 92 F (82F) 88 F (66F) 65 F (49F) 54 F (41F)
Max Temp Rise @ 2.25 GPM
240v (208v)
92 F (82F) 87 F (66F) 73 F (54F) 58 F (44F) 43 F (37F) 36 F (27F)
Max Temp Rise @ 3.0 GPM
240v (208v)
82 F (61F) 66 F (49F) 54 F (41F) 44 F (33F) 33 F (25F) 27 F (20F)
Max Temp Rise @ 4.0 GPM
240v (208v)
55 F (41F) 44 F (33F) 37 F (27F) 29 F (22F) not recommended
Max. Output Temperature 140F (60C) 140F (60C) 140F (60C) 125F (52C) 125F (52C) 125F (52C)
Heating Modules 3 2 1
Dimensions 16.6 x 14.5 x 4.6" (42 x 36.8 x 11.7cm)
Weight 17.6 lbs (8.6kg) 15.4 lbs (7.3kg) 13.2 lbs (6.1kg)
Energy Efficiency 99%+ energy efficient
Activation Flow Rate 0.77 GPM / 2.9 LPM 0.50 GPM / 1.9 LPM 0.37 GPM / 1.4 LPM
Pipe Fittings 3/4" NPT
Working Pressure Max. Recommended Pressure = 150 psi (10 bar) - tested to 300 psi (20 bar).
Maximum recommended input temperature 107F (42C).
Voltage Requirements 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps
(@ 240 volts)
150 Amps 120 Amps 100 Amps 80 Amps 60 Amps 50 Amps
Max. Amps
(@ 208 volts)
132 Amps 105 Amps 88 Amps 70 Amps 52 Amps 44 Amps
Breakers Recommended* 3 x 50 Amp 3 x 40 Amp 2 x 50 Amp 2 x 40 Amp 2 x 30 Amp 1 x 50 Amp
Minimum amps to home 300 Amps 200 Amps 150 Amps 125 Amps 100 Amps
Recommended Wiring*
(AWG Copper)
3 x #6 3 x #8 2 x #6 2 x #8 2 x #10 1 x #6
Safety ETL Listed (USA and Canada)
Independently tested to comply with both US and Canadian safety standards
including ANSI/UL499 and CSA-E335-1/3E-94

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Stiebel Eltron
Tempra 36
Stiebel Eltron
Tempra 29
Stiebel Eltron
Tempra 24
Stiebel Eltron
Tempra 20
Stiebel Eltron
Tempra 15
Stiebel Eltron
Tempra 12

* 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.