Stiebel Eltron Tempra 24 Tankless Water Heater

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internal view of the Stiebel Eltron tankless water heater
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Stiebel Eltron Tempra Series Brochure
Stiebel Eltron Tempra Series Brochure
(Adobe PDF)

Stiebel Eltron Tempra Series Electrical requirements & installation information
Electrical Requirements & Installation Information

Stiebel Eltron Tempra 24

MSRP: US$824.00
Our Price: US$649.00
You save: $175.00

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  • 24 kW's of Power
  • Thermostatically Controlled
  • Requires 200 Amp Service
Our most popular heater for whole house applications, the Stiebel Eltron Tempra 24 electric tankless water heater is a powerful 24 KW heater which is an excellent choice for most whole house applications in the Northern U.S., Canada, and other regions where the incoming water temperature can drop below 45° F.

The Tempra 24 is also frequently used in warmer southern climates for applications requiring higher flow rates of up to 5 gallons per minute (large Roman-style or jacuzzi tubs, simultaneous showers, etc.), as well as for commercial applications.

Like all Tempra Series tankless water heaters, the Tempra 24 features true microprocessor-controlled temperature regulation and a 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 24 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 result is 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 2.5 GPM
45°F 2.7 GPM
50°F 3.0 GPM
55°F 3.3 GPM
60°F 3.6 GPM
65°F 4.1 GPM
70°F 4.7 GPM
75°F 5.4 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 exceeds 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 24 Specifications
Thermostatically Controlled? Yes, temperature control with full power modulation based on flow rate and incoming water temperature.
KW 24 KW @ 240v / 18 KW @ 208v
Voltage: 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps: 100 AMPS @ 240v / 88 AMPS @ 208v
Breakers Required:*  2 x 50 AMP breakers (depends on local codes)
Wiring:*  Minimum 2 x #6 AWG Copper (depends on local codes)
Dimensions: 16.6 x 14.5 x 4.6" (42.0 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)
Warranty: Manufacturer's 3 Year Warranty
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

* 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 200 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.

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