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  • Works as 2-in-1 model with 12 kW of power at 240V and 9 kW at 208V
  • Advanced flow control ensures a constant temperature output
  • Single flow sensor design
  • Hinged cover for easy access
  • Superior, reliable performance with seismic-proof construction
  • Sleek, no-vent design that is nearly 100% efficient
  • 7 year warranty against leakage, 3 year warranty against defects
  • ETL Listed
Special Order

Some items on our website are not normally stocked in our warehouses. These items are marked "Special Order"
underneath the price on the item's page.

Please understand that Special Order items may not be able to ship within 1 business day like our regularly-stocked items.
Some may be shipped directly from the manufacturer. Others might have to be ordered into our warehouse with the next order
from that manufacturer and then shipped to you; this could take up to several weeks.

As a result, we urge you to contact us if you have questions about the delivery time of a Special Order item you wish to order.

Please note - we are not always able to cancel special order items once the order is placed. These items may also be non-returnable. Please contact us if you have any questions before ordering this item.

MFR Item:
Width 16 5/8 Inches
Depth 4 5/8 Inches
Height 14 1/2 Inches
Amps 44 Amps
Hertz 60
Phase 1
Voltage 208 Volts
Wattage 9 Kilowatts
Flow Rate 0.37 GPM
Power Type Electric
Style Tankless
Type Multiple Points of Use

Customer questions about this product

How hot will this product make my water?
How much this unit will heat your water above its ambient temperature is dependent upon the water's flow rate. Please consult the Temperature Rise versus Flow Rate chart in the Specification Sheet for additional information.
Ask your own question!


The powerful Stiebel Eltron 223420 Tempra 12 whole house tankless electric water heater instantly provides hot water to up to five low flow sinks! This energy-efficient unit works as a 2-in-1 model that can use 12 kW of power with 240V service and 9 kW of power with 208V service to heat the water as it flows through the machine for complete elimination of standby heat loss. Activated by a minimum 0.37 GPM flow rate, the Tempra 12 features an ergonomic control knob that allows you to adjust the water temperature from 86 to 140 degrees Fahrenheit. It has several temperature and flow sensors that feed their readings into the unit's proprietary microprocessor control so the temperature will never deviate from the set point.

The Stiebel Eltron 223420 Tempra 12 whole house tankless water heater features a compact construction with a sleek, attractive design that allows it to be installed almost anywhere! It is ETL Listed, requires a 208V or 240V electrical connection, and must be hardwired; it does not come with a cord and plug. Please consult the Specification Sheet for additional details, installation requirements, and a helpful sizing guide.

Overall Dimensions:
Left to Right: 16 5/8"
Front to Back: 4 5/8"
Height: 14 1/2"

Please note: This unit is designed to supply hot water to a single lav, kitchen or utility sink; can also be used on a single shower or up to 5 low flow sinks. Please consult the Sizing Guide in the Specification Sheet for further information to ensure that this model will meet your needs.

Because this item is not stocked in our warehouse, processing and transit times will vary. If you need your items by a certain date, please contact us prior to placing your order. We cannot guarantee that this item can be cancelled off of the order once it is placed.


ETL US & Canadian


Spec Sheet Specsheet Manual Manual Warranty Warranty

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