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Stiebel Eltron

Model # Tempra 20 Plus

Internet # 203210872

Tempra 20 Plus 19.2 kW 2.91 GPM Whole House Tankless Electric Water Heater

This item has been discontinued.
The Home Depot no longer carries this specific product.

$699.00 /each

  • Same-day installation in most areas. Call 1-855-400-2552 by noon.




Model # Tempra 20 Plus

Internet # 203210872

Stiebel Eltron developed tankless electric water heating technology 90 years ago and continues as 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. Our Tempra models are whole house tankless electric water heaters, never wasting energy storing hot water, but delivering it as you need it, for as long as you need it. The compact design needs no venting, allowing installation close to your draw off points, making your wait for hot water as short as possible and maximizing your energy savings. Tempra tankless water heaters are sized based on the number of bathrooms and your climate. Refer to the Tempra Sizing Guide under 'More Views' to determine which model you need. Call Stiebel Eltron at 800.582.8423 if you have high flow showers, or any sizing questions. Tempra water heaters supply water at a constant temperature from 86 to 140 degrees F that is settable on the front panel. We recommend setting the actual highest temperature you use, typically 107 degrees for a shower. Tempra Plus models incorporate an Advanced Flow Control that automatically reduces flow to deliver water at the set point if demand exceeds capacity. Regular Tempra models do not have this feature and should be considered if this is not of concern. Tempra 20 models provide hot water for 1 or 2 bathrooms in warm climates, or 1 bathroom in cool climates.

  • Professional installation recommended
  • Tempra 20 models require 208 or 240 volt electric service, with a maximum draw of 14,400 watts at 208 volts or 19,200 watts at 240 volts
  • A minimum of 200 amp total service to the residence is necessary, with 2 separate 50 amp breakers and 8 gauge copper wiring for the Tempra 20
  • Tempra tankless electric water heaters are 99% efficient and typically result in savings of 15-20% in comparison with electric tank-type water heaters
  • Tempras use only the amount of energy necessary to heat the water needed
  • The sleek European design is considerably smaller than a tank, saving space and allowing flexibility to determine the best location for installation
  • Tempra units must be installed vertically with the water fittings pointing down
  • Tempra tankless water heaters work better than tank-type water heaters in hard water environments because they can be set to lower temperatures, which minimizes scale formation
  • Water connections for Tempra water heaters must be detachable (such as braided steel flex connectors) to allow periodic filter cleaning, including flushing for scale if hard water is present
  • Tempra tankless water heaters are ETL Listed for compliance with CSA and UL safety standards in the US and Canada
  • Tempra tankless electric water heaters are exempt from seismic code
  • Overheat safety protection and thermal protection reset are standard
  • See warranty for complete details of the 3-year residential and commercial warranty against defects in workmanship and materials under normal use
  • This is a Tempra Plus model that incorporates an Advanced Flow Control to automatically reduce flow to deliver water at the set point if demand exceeds capacity
  • Stiebel Tempra Sizing Guide:

    Stiebel Tempra Sizing Guide

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Water Connection Size (in.) 
3/4” NPT 
Amperage (amps) 
Electric Product Type 
Commercial & Residential 
Finish Family 
Flow Rate @ 35 F Rise (gallons/min) 
Flow Rate @ 45 F Rise (gallons/min) 
Fuel Type 
Maximum Temperature (F) 
Minimum Activation Rate (gpm) 
Minimum Temperature (F) 
Product Weight (lb.) 
15.4 lb 
Residential/Commercial/industrial Use 
Residential, commercial or industrial 
Water Connection Location 
Water Heater Features 
Overheat Protection 
Wattage (watts) 
Warranty / Certifications
Certifications and Listings 
4-UL Certified,CSA Listed,ETL Listed 
ENERGY STAR Certified 
Labor Warranty 
No Warranty 
Part Warranty 
3 Year 


Rated 3.3 out of 5 by 3 reviewers.
Rated 5.0 out of 5.0 by Great Electric Tankless HWH The Steibel Eltron was one of the few brands that seemed to know what they were doing when I originally wanted to purchase a Tankless Water Heater. I bought this to replace an existing 40 Gal. HWH that was not properly winterized and was destroyed when the foreclosed property I purchased had been abandoned about 8 months before I bought it. I installed the unit in a 100 Amp box on 2-50 Amp breakers, so in theory, it could potentially use all of the power in my home, but I have never had any issues with power when people are taking a shower and the microwave is being used, or any other major power draws are happening. I can't really speak to issues of flow, but there have been as many people as 4 living in my home at one time, and I think the bigger issue tends to be when other people draw cold water and the mix gets changed in the shower. I have also installed a low-flow (pressure adjustable) Kohler Shower Head, and Aerators at the main faucets, which help limit flow, but getting enough hot water has never been a problem. I actually tended to have issues with not drawing enough water flow through to kick it on, which might be my only grief with the unit. If I just want a small amount of hot water to rinse dishes or the like I sometimes need to fiddle around with it or kick it on higher to get the HWH to kick on. Anyway, my unit was installed in June of 2008 and I've had no issues with it since. I'd highly recommend. February 16, 2015
Rated 4.0 out of 5.0 by Very reliable Unit..... I see that someone had a problem with there Tempra 20 Plus, I installed one of these in a new house ( River Place) I had low flow at first and found out that it has a built in stainer on the inlet. Something from the new well had stopped it up. Causing low flow right off the bat. Cleaned it out and going strong for 6 years Now. May 5, 2014
Rated 1.0 out of 5.0 by Expensive Mistake After installing I have been very disappointed in the water heaters performance. The temp has to be turned up to achieve a good level of water. Even then the water pressure is very low. It is fed by a 3/4 inch line with 65lbs of water pressure. I get barely enough flow to take a shower. Heavens forbid someone else turns on the water to wash their hands. Very expensive mistake. Will never order an electric again. November 29, 2013
  • 2015-10-03T12:08:33.019-05:00
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