Model # Tempra 12

Internet #203210867

Stiebel Eltron Tempra 12 Self-Modulating 12 kW 2.34 GPM Electric Tankless Water Heater
0094922100603

Stiebel Eltron

Tempra 12 Self-Modulating 12 kW 2.34 GPM Electric Tankless Water Heater

  • Self-modulating technology saves energy
  • Endless hot water
  • Made in Germany

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Product Overview

Powerful output, compact design, remarkable energy-saving features: Our whole house electric tankless water heaters are made to perform to the highest standards in terms of comfort and reliability. Intelligent self-modulating technology continually ensures the least amount of energy is used to heat the water. The Tempra 12 provides hot water at a constant temperature for 1 bathroom in warm climates and for 1 bathroom at a cabin or cottage in cold climates. See sizing guide to determine which model is best for you (guide assumes 2 GPM or less per shower-head). Stiebel Eltron invented tankless electric water heating technology more than 90 years ago, and is still the industry pioneer and world leader. Our engineering and manufacturing tradition of excellence means you can depend on the performance and reliability of our products. Call Stiebel Eltron at 800-582-8423 if you have high flow showers or any sizing questions.

  • Warranty: 7 years against leakage and 3 years parts (see warranty manual for details)
  • 99% efficient- saves 15-20% (up to 30%) on electric bills compared to an electric tank-type water heater
  • Endless hot water
  • Thermostatic control range from 86-140°F
  • Self-modulating control saves energy by adjusting electrical usage based on demand
  • Saves space - no venting required
  • Requires 240 or 208-Volt
  • Recommended minimum of 100 total amp service, with 1 separate, dedicated 50 Amp circuit
  • Professional installation recommended
  • Call Stiebel Eltron at 800.582.8423 with any sizing questions



  • Stiebel Tempra Sizing Guide:

    Stiebel Tempra Sizing Guide

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Info & Guides

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Name 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater Tempra 12 Self-Modulating 12 kW 2.34 GPM Electric Tankless Water Heater 36 kW 240-Volt Self-Modulating 6 GPM Electric Tankless Water Heater Tempra 24 Plus Advanced Flow Control and Self-Modulating 24 kW 4.68 GPM Electric Tankless Water Heater
Brand EcoSmart Stiebel Eltron EcoSmart Stiebel Eltron
Ratings (142) (16) (17) (62)
Wattage (watts) 18000 12000 36000 24000
Certifications and Listings 1-UL Listed,CSA Listed,ETL Listed 4-UL Certified,CSA Listed,ETL Listed 1-UL Listed,CSA Certified,ETL Listed 4-UL Certified,CSA Listed,ETL Listed
Indoor/Outdoor Indoor Indoor Indoor Indoor
Water Heater Features Wall Mountable Overheat Protection,Wall Mountable Wall Mountable Overheat Protection,Wall Mountable
Flow Rate @ 45 F Rise (gallons/min) 2.73 1.82 gal (US)/min 5.46 3.64
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Customer Questions & Answers

water softener added

Can you add a water softener to a tankless water heater system? Do you use one with salt or without?
Asked by: question
I have a softener and iron curtain. No problem!
Answered by: bkpro
Date published: 2015-12-10

I see a review that filling a tub does not work well?

I am considering using this for a small, 504 sq ft cabin in which I will have a shower, sink, and an ALMOST full size tub. As well as kitchen sink. That is it.Oklahoma weather and well water, and the kitchen and bathroom very close together and close to where this device will be installed. Anyone know if I should still have problem running a full, hot bath? Suggestions for better winter use?
Asked by: tmills
You will have to slow the flow to maintain the temperature depending on the temp of the water coming into the unit. A tub faucet runs around 3-5 gallons per minute but the heater may only put out 1 and a half per minute at 110 degrees. I is suggested that you get 2 of these units to keep up to the volume of a tub. What is really cool is that there a red indicator light in the unit that tells you if the unit is keeping up. If it is blinking it is not keeping up. I turned on the shower and kitchen sink at the same time. Then I turned the hot shutoff down on the sink until the light in the unit stopped blinking. I am restricted slightly at the kitchen faucet but at least if someone is washing dishes while someone is in the shower there won't be any screams. I have a small cabin also. I don't think you have much of a winter down by you but you will notice the difference of output if the well water is colder. Our well water temp is around 50 degrees maybe 55 in the summer.
Answered by: bkpro
Date published: 2016-04-07

specification error

Specifications provide lower flow for 35 F rise than for 45 F rise - this is clearly wrong. What are the correct flow rates? Flow Rate @ 35 F Rise (gallons/min) 1.82 Flow Rate @ 45 F Rise (gallons/min) 2.34 Flow Rate @ 55 F Rise (gallons/min) 1.49
Asked by: Strider22
Here are the flow rates based on the Temp Rises cited above for the Tempra 12 or Tempra 12 Plus: 35 F Rise 2.3 gpm 45 F Rise 1.8 gpm 55 F Rise 1.5 gpm Assumption: you are connecting at 240 V
Answered by: Wrenchman
Date published: 2016-03-23

i have a 4800sqft home wat size tankless water heater

Asked by: cowboy
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Customer Reviews

Tempra 12 Self-Modulating 12 kW 2.34 GPM Electric Tankless Water Heater is rated 4.8 out of 5 by 16.
Rated 5 out of 5 by from EASY INSTALL . HOPEFULLY IT HAS A LONG LIFE .... EASY INSTALL . HOPEFULLY IT HAS A LONG LIFE .
Date published: 2017-06-15
Rated 5 out of 5 by from EASY TO INSTALL AN WORKS GREAT EASY TO INSTALL AN WORKS GREAT
Date published: 2017-02-28
Rated 5 out of 5 by from Easy to install. Provides ample hotwater and does not use electircity all the time to keep your water hot in a tank. This was my first tankless hotwater heater and found it easy to install. I have it set at 126 degrees so I can cut it back with cold water. I have a long run (53 ft) from one end of the house to the other so I purchase a second hotwater to eliminate the long wait for the hot water to reach the kitchen and guest bath. The thing to keep in mind is that it will put out 2.3 gal per min. If you are demanding more, the flow is cut back because it only has the set amount of 2.3 gal per min. If you are on a well, I would recommend some type of filter in your water line before it reaches your heater.
Date published: 2013-05-21
Rated 5 out of 5 by from Very simple, efficient for low-altitude cities I've never installed a water heater before, and was able to do it in a couple hours. Installation is fast and simple, and I ended up with no leaks and a cheap, endless supply of hot water. I would strongly recommend it as a replacement for your 30-40 gallon tank
Date published: 2012-05-08
Rated 5 out of 5 by from this tempra has saved me so much money on my electric as well as my oil bill I had no clue how much money this small product would save me! until I got my electric bill. Then not needing to call for oil to heat my water was a dream come true. IT WORKS<< WAY Beyond what is advertised, a must to own and simple to install. your a winner in my book.
Date published: 2013-08-07
Rated 5 out of 5 by from Great for limited space Was not very hard to install. The flow of hot water seems to be enough for showering. We have a 1200 sq ft 2nd home with 1 shower and more than likely not run washer and dishwasher at same time. Not sure on the light bill yet. We also put a filter system in because it was recomended with well water. Works great for our needs.
Date published: 2013-02-11
Rated 4 out of 5 by from Did Not Meet Expectations Was easy to install with exception of running new electric. Is installed in a 2 bedroom 1 bath apt with washing machine. Its specifications allege to handle this situation as a "whole house" hot water heater. All except bathing works well. In the bathtub, the water cycles between hot to very cold. It can be controlled somewhat by reducing the water volume. It works fine for taking a shower and maintains temperature but not for filling the tub for a bath.
Date published: 2013-12-05
Rated 5 out of 5 by from Great Product This product was great. Easy to install, takes up very little room and provides hot water as long as you need it.
Date published: 2016-08-09
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