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The 12 KW Stiebel Eltron Tempra 12 tankless water heater is a popular, economically-priced point-of use tankless water heater used for low flow applications such as single sinks in restrooms, powder rooms, kitchens, low-flow pool house showers, emergency eyewash stations, etc. This model is not generally considered sufficient for whole house applications, even in warm climate areas.
Maximum Flow Rate in Gallons Per Minute at 105F Output Temperature |
| Incoming Water Temp: |
Flow Rate (GPM) |
| 40F |
1.3 GPM |
| 45F |
1.4 GPM |
| 50F |
1.5 GPM |
| 55F |
1.6 GPM |
| 60F |
1.8 GPM |
| 65F |
2.0 GPM |
| 70F |
2.3 GPM |
| 75F |
2.7 GPM |
* This chart is based on 240v power input. Please see brochure for temp rise chart based on 208v input.
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Like all Tempra Series tankless water heaters, the Tempra 12 features a convenient dial selector which allows you to set the desired output water temperature at any level between 86 and 140F (30 and 60C). Most importantly, 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. In layman's terms, the Tempra 12 will automatically sense the water flow rate and temperature, calculate how much power is needed to do the job, and will apply exactly that much power so it can precisely maintain the desired output temperature regardless of whether the flow rate changes or not. The result is the most precise temperature control of any tankless water heater on the market today!
Stiebel Eltron Tempra 12 Specifications |
| Thermostatically Controlled? |
Yes, temperature control and full power modulation based on flow rate and incoming water temperature. |
| KW |
12 KW @ 240v / 9 KW @ 208v |
| Voltage: |
208 - 240 volts / single phase / 50 - 60 Hz |
| Max. Amps: |
50 AMPS @ 240v / 44 AMPS @ 208v |
| Breakers Required:* |
1 x 60 AMP breakers (depends on local codes) |
| Wiring:* |
Minimum #6 AWG Copper (depends on local codes) |
| Dimensions: |
16.6 x 14.5 x 4.6" (42 x 36.7 x 11.6 cm) |
| Weight: |
13.2 lbs (6.1kg) |
| Pipe Fittings: |
3/4" NPT |
| Energy Efficiency: |
99%+ |
| Activation Flow Rate: |
0.37 GPM / 1.4 LPM |
| Max. Water Pressure: |
150 psi |
| Warranty: |
Manufacturer's 3 Year Warranty |
| Safety: |
ETL Listed (USA & Canada) - complies with both US and Canadian safety standards including ANSI/UL499 and CSA-E335-1/3E-94. |
| Protection: |
microprocessor-based thermostatic temperature control (flow rate and temperature modulating) with thermal hi-limit cut-out switch monitoring each heating module |
Please note: A minimum 100 AMP household electrical service is highly recommended and will likely be required to install this model. Most homes have at least 100 AMPS of service, however, if you are unsure of your electrical capacity in your home, please consult your electrician or contact us for assistance before ordering.
* 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.
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 See an internal view of the Stiebel Eltron Tempra tankless water heater - learn how it works and what makes it superior to the competition. (Click the picture)
 Installation Information and Electrical Requirements

Stiebel Eltron Tempra Series tankless water heaters are independently tested to comply with both US and Canadian safety standards including ANSI/UL499 and CSA-E335-1/3E-94.
Stiebel Eltron is
 Quality you can count on! Manufactured in Germany
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