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A Stiebel Eltron tankless water heater is one of the most respected choices in electric water heating. Here’s how the Tempra and DHC lines compare.
Stiebel Eltron is a German manufacturer of electric water heaters and heat pumps, with U.S. headquarters in Massachusetts. It is especially known for electric tankless water heaters with precise electronic temperature control.
A Stiebel tankless water heater (or Stiebel electric tankless water heater) is often recommended by electricians for its build quality.
| Model | Approx. power | Approx. amps at 240V | Typical use |
|---|---|---|---|
| Tempra 12 / 15 | 12–14.4 kW | 50–60 A | One shower in warm climates, apartments |
| Tempra 20 | about 19 kW | about 80 A | Small homes, warm climates |
| Tempra 24 | 24 kW | 100 A | 1–2 bathrooms, warm to mild climates |
| Tempra 29 | about 29 kW | about 120 A | 2 bathrooms, warm to mild climates |
| Tempra 36 | 36 kW | 150 A | Whole house, larger demand |
Each comes in Plus (with Advanced Flow Control) and, for some sizes, Trend versions. Part numbers such as 239221 (Tempra 20 Plus), 239222 (Tempra 24 Plus), 239225 (Tempra 36 Plus) and 239216 (Tempra 24 Trend) identify exact models.
The Stiebel Eltron Tempra Plus tankless water heater range tops out with the Stiebel Eltron Tempra 36 Plus tankless water heater, a common Stiebel Eltron Tempra 36 electric whole house tankless water heater choice in the South.
When you ask for more hot water than the unit can heat, a standard electric tankless heater lets the temperature drop. Tempra Plus units instead reduce the flow slightly to keep the water at your set temperature. That makes the Tempra Plus a good choice in colder months or where flow demand varies.
The DHC series and Mini units are compact point-of-use heaters for sinks and some showers, in 120V and 240V versions. The DHC-E models add electronic temperature control. See point-of-use water heaters.
Tempra units need dedicated 240V circuits, large breakers and heavy copper wire. Confirm panel capacity with an electrician. Install isolation valves for maintenance and follow the manual for clearances. See installation requirements.
See also EcoSmart and Rheem RTEX models, or compare fuels in gas vs electric tankless.
Tempra-class units and alternatives with full electrical specs.
Tempra Plus models include Advanced Flow Control, which automatically reduces flow slightly when demand exceeds capacity so the water stays at the set temperature. Trend models are simpler, lower-cost versions. Compare the spec sheets for the exact differences.
In warm southern climates, a Tempra 24 or 29 often covers 1–2 bathrooms; a Tempra 36 suits larger demand. In cold climates, even a Tempra 36 may be limited to one or two fixtures in winter. Use our sizing calculator.
At 36 kW and 240V, about 150 amps, usually split across several double-pole breakers. Many homes need 200-amp or larger service. The manual lists exact requirements.
They are Stiebel Eltron part numbers for specific models, such as the Tempra 20 Plus (239221), Tempra 24 Plus (239222) and Tempra 36 Plus (239225). They help you confirm you are buying the exact model.
This guide is general information for U.S. homeowners, not professional advice. Gas, electrical and venting work must follow the manufacturer’s instructions and local codes, and in most areas requires a licensed plumber, electrician or gas fitter and a permit. Specifications and prices change; always confirm details on the product page and in the installation manual.
