Stiebel Eltron Tempra Trend Electric Tankless Water Heaters

micro-processor controlled flow and temperature-based power podulation for precise temperature control

Stiebel Eltron Tempra Trend

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The new Tempra Trend Series replaces the Tempra (B) Series.

They offer all the same features as the old Tempra B series, with a new digital display, and a modern white powder-coated case.

The new Stiebel Eltron Tempra Trend tankless water heaters feature true microprocessor-controlled temperature regulation and a digital display, as well as a convenient 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. Tempra models 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 Trend Series is available in various power levels for a wide range of whole house and commercial water heating applications.

Stiebel Eltron Tempra Trend Series Whole House Electric Tankless Water Heaters
Model Power Level Application Price
Tempra 36 36 KW Extreme North and/or Very High Flow Rates
free shipping
Tempra 29 Trend 28.8 KW Northern Regions or Higher Flow Rates
free shipping
Tempra 24 24 KW Northern Regions or Higher Flow Rates
free shipping
Tempra 20 19.2 KW Southern USA / Moderate Flow Rates
free shipping
Tempra 12 12 KW Tropical / Point of Use
free shipping
Stiebel Eltron Tempra Trend Whole House Electric Tankless Water Heaters
Tempra 36 Tempra 29 Trend Tempra 24 Tempra 20 Tempra 12
Application Extreme North and/or Very High Flow Rates Northern Regions or High Flow Rates Northern Regions or Higher Flow Rates Tropical / Point of Use
Temperature Control Technology Full micro-processor-based thermostatic temperature control featuring full power modulation
based on flow rate and incoming water temperature.
Digital Display Yes
Hinged Case Yes
Power (KW's @ 240v) 36 KW 28.8 KW 24 KW 19.2 KW 12 KW
Power (KW's @ 208v) 27 KW 21.6 KW 18 KW 14.4 KW 9 KW
Max Temp Rise @
1.5 GPM240v (208v)
92F (92F) 92F (92F) 92F (82F) 88F (66F) 54F (41F)
Max Temp Rise @
2.25 GPM240v (208v)
92F (82F) 87F (66F) 73F (54F) 58F (44F) 36F (27F)
Max Temp Rise @
3 GPM240v (208v)
82F (61F) 66F (49F) 54F (41F) 44F (33F) 27F (20F)
Max Temp Rise @
4 GPM240v (208v)
55F (41F) 44F (33F) 37F (27F) Not Recommended
Max Output Temperature 140F (60C) 125F (52C)
Heating Modules 3 heating modules 2 heating modules 1 heating module
Dimensions 16.6" x 14.5" x 4.6" (42 x 36.8 x 11.7cm)
Weight 19 lbs (8.6kg)15.4 lbs (7.3kg) 13.5 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)
Voltage Requirements 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps
(@ 240 volts)
150 Amps 120 Amps 100 Amps 80 Amps 50 Amps
Max. Amps
(@ 208 volts)
132 Amps 105 Amps 88 Amps 70 Amps 44 Amps
Breakers Recommended* 3 x 50 Amps 3 x 40 Amps 2 x 50 Amp 2 x 40 Amp 1 x 50 Amp
Minimum Amps to Home 300 Amps 200 Amps 100 Amps
Recommended Wiring*
(AWG Copper)
3 x #6/2 3 x #8/2 2 x #6/2 2 x #8/2 1 x #6/2
Safety ETL Listed (US & Canada)
Independently tested to conform all applicable safety standards including
ANSI/UL 499 (USA) and CSA-E335-1/3E-94 (Canada)
Input Temperature
131F (55C)

Lowest Price Guaranteed!
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Stiebel Eltron Tempra 36 electric tankless water heater
Tempra 36
Tempra 29
Tempra 29
Tempra 24
Tempra 24
Tempra 20
Tempra 20
Tempra 12
Tempra 12

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

Important Pre-Purchase Information

Prior to purchasing your Stiebel Eltron Tankless Water Heater, it is important that you ensure that your home has sufficient electrical capacity for the desired model, or that you have budgeted for any upgrades that might be necessary. Please note that all electrical tankless water heaters, regardless of the manufacturer's claim, are restricted in reality to approximately 3 gallons per minute of flow at any given time in cold winter climates. This is generally more than enough for residential applications, however, certain simultaneous water usages in the home at single or multiple outlets may exceed this capacity. Please bear this in mind when selecting a model or system for your home. See the chart on our Tankless Water Heater Model Selector page for maximum flow capabilities based on your climate and model selected.

Electrical Requirements for Stiebel Eltron Tempra Series Tankless Water Heaters:

Before purchasing a Stiebel Entron, or any other electric tankless water heater, please ensure that your home has sufficient electrical capacity for your desired model, or that you have taken note of any upgrades that may be required.

Model Recommended
Maximum Amperage
@ 240 V
Maximum Amperage
@ 208 V
Recommended Household
Electrical Service
Recommended Minimum
Wire Gauge
Tempra 36 / 36 Plus 3 x 50 AMPS * 150 AMPS 132 AMPS 300 AMPS 3 x #6 AWG*
Tempra 29 / 29 Plus 3 x 40 AMPS * 120 AMPS 105 AMPS 200 AMPS 3 x #8 AWG*
Tempra 24 / 24 Plus 2 x 50 AMPS * 100 AMPS 88 AMPS 200 AMPS 2 x #6 AWG*
Tempra 20 / 20 Plus 2 x 40 AMPS * 80 AMPS 70 AMPS 125 AMPS 2 x #8 AWG*
Tempra 15 / 15 Plus 2 x 30 AMPS * 60 AMPS 52 AMPS 100 AMPS 2 x #10 AWG*
Tempra 12 / 12 Plus 1 x 50 AMPS * 50 AMPS 44 AMPS 100 AMPS 1 x #6 AWG*

* 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.

The above specifications are only guidelines. If your home is already equipped with a large number of electrical appliances, you may require a larger electrical service than the one recommended above. Please consult an electrician before placing an order.

If your home does not have the minimum household electrical service as specified for your desired model, you can still purchase a Stiebel Eltron tankless water heater, however, upgrades to your electrical service will likely be required. It is recommended that you consult your certified electrician for a quote, prior to purchasing.

Please be aware that uninstalled units returned due to a home that has inadequate electrical service may subject to a re-stocking fee. Please see our POLICIES page for more details.