STIEBEL ELTRON
Tempra® Plus & Trend
WHOLE HOUSE ELECTRIC TANKLESS WATER HEATERS
Simply the Best
Proven Reliability from the World-Leader
Self-Modulating Energy Technology
Exclusive Advanced Flow Control™
Unlimited Supply of Hot Water
Sleek Space-Saving Design Needs No Venting
7/3-Year Warranty
Made in Germany
ETL LISTED
ISO 9001 CERTIFIED
Tested and certified by WQA against NSF/ANSI/CAN 372 for lead free compliance.
800.582.8423
www.stiebel-eltron-usa.com
The Best: Electric Tankless Water Heating
Tempra® is manufactured by Stiebel Eltron, a pioneer and leader in tankless water heating technology since 1924. Advanced technology, impressive energy-saving performance, and a compact design are only a few of the reasons to consider a Tempra tankless water heater.
Saves Energy and Reduces Your Electric Bills
Changing to a Tempra tankless water heater means there are no standby losses that tank-type water heaters are subject to. This results in savings of at least 15-20% in comparison with an electric tank water heater.
Unlimited Supply of Hot Water
Because a Tempra® heats water only as it is used, and for as long as it is needed, there is an endless supply of hot water. Nobody runs out of hot water in the shower, even if the showers run extra-long.
Sleek Design Saves Space
A Tempra from Stiebel Eltron completely replaces a conventional tank heater, yet takes up considerably less space, saving valuable living space and providing endless hot water on demand.
Easy to Install
Large and bulky hot water tanks are usually placed in a basement or utility room. Because the tank may not be close to where hot water is used, there is a wait for hot water. A Tempra's compact design can be installed close to the hot water taps. When this can be done, in new construction for instance, the wait for hot water becomes as short as possible. Even in a retrofit, where it might not be possible to place a Tempra closer to the hot water draw-off points, its considerably smaller size has many advantages.
No Venting Required
Tempra tankless water heaters are electric and require no venting. This allows for more flexibility when determining the best place for installation.
Seismic Proof Construction
Because a Tempra® is a tankless water heater, it is not subject to seismic building code. There is no need for the preventative construction required with a tank water heater.
Maximum Output Temperature Limit
Tempra® tankless water heaters can be set to limit the maximum hot water temperature to 109 °F. This can be important in some installations to prevent the possibility of scalding.
Self-Modulating Energy Savings
All Tempra models include self-modulating energy technology. Energy output is continually and automatically adjusted to ensure that only the smallest amount of electricity necessary is used to heat the water.
Constant Temperature Output
Smart microprocessor technology in a Tempra® allows setting the knob on the front cover to the water temperature needed and getting that temperature every time a hot water tap is opened. Our exclusive Electronic Temperature Control ensures a steady output temperature even if flow rates vary up or down. Tankless electric water heaters from other manufacturers don't maintain a steady temperature if the flow varies. A Tempra® always does.
Variable Flow
Both Tempra models have a convenient digital display, making it easy to get hot water at the desired temperature from hand washing temps of 68 °F (20°C) to shower temps of 107 °F (42°C), and up to 140°F (60°C) for commercial applications.
Advanced Flow Control™
Advanced Flow Control was invented by Stiebel Eltron and awarded German patent DE 3805441 C2, among others. No other manufacturer of electric tankless water heaters has anything like it. Advanced Flow Control is exclusive to our Tempra® Plus models. If the demand asked of a Tempra Plus is greater than the unit can handle, Advanced Flow Control™ works by slightly reducing the flow of water. Instead of delivering colder water than the set point, a Tempra® Plus automatically delivers slightly less water, but at the correct temperature.
Comparison Table
| Feature | Tempra® Plus | Tempra® Trend | Other Manufacturers |
|---|---|---|---|
| Advanced Flow Control™ | ✓ | ||
| Preset temperature memory buttons | ✓ | ✓ | |
| Energy monitor showing cost savings | ✓ | ✓ | |
| Provides continuous hot water on demand | ✓ | ✓ | ✓ |
| Saves energy with auto-modulation | ✓ | ✓ | ✓ |
| Digital display for accurate temperature setting | ✓ | ✓ | ✓ |
| Smart microprocessor technology for steady temperature with variable flow | ✓ | ✓ | ✓ |
| Made in Germany | ✓ | ✓ | |
| Solid copper heating chambers | ✓ | ✓ |
Temperature Rise vs. Flow Rate
A graphical representation shows that Tempra® Plus consistently supplies hot water across various demand levels, while other manufacturers' units may deliver cold water. The graph illustrates temperature rise in °F against flow rate in GPM for different demand levels (Low, Medium, High).
Key takeaway: Tempra® Plus supplies hot water; other manufacturers run cold.
Easy To Size For Every Home
Stiebel Eltron customer service provides sales assistance for our water heaters, including sizing recommendations, to both homeowners and professional installers. Please call or email if you have any questions.
- Use the map to find the approximate ground water temperature where you live.
- Check the column on the table with your ground water temperature to see how many fixtures can be supplied at the same time with hot water.
- Use your actual maximum flow rate to fine-tune these recommendations. If you know you have 1.5 GPM low flow showerheads, for instance, then 3 GPM would supply 2 showers at the same time, or 1 shower plus 1 sink, etc.
Inlet water temperatures shown are an average for each zone, and may vary both seasonally and by exact location.
Temperature Zones: 42°F, 52°F, 62°F, 72°F
Sizing Guide by Model
The following table provides maximum flow rates (GPM) for different Tempra models based on inlet water temperature and simultaneous fixture usage. It also indicates the recommended minimum electric service amperage.
- Tempra® 12 Trend & Plus: DRAWS 50 A - Recommended minimum 100 A electric service. Max flow rates: 1.3 GPM (low flow shower), 1.6 GPM (simultaneous fixtures), 1.9 GPM (simultaneous fixtures), 2.5 GPM (simultaneous fixtures).
- Tempra® 15 Trend & Plus: DRAWS 60 A - Recommended minimum 100 A electric service. Max flow rates: 1.6 GPM, 1.9 GPM, 2.3 GPM, 3 GPM.
- Tempra® 20 Trend & Plus: DRAWS 80 A - Recommended minimum 125 A electric service. Max flow rates: 2.1 GPM, 2.5 GPM, 3.1 GPM, 4 GPM.
- Tempra® 24 Trend & Plus: DRAWS 100 A - Recommended minimum 150 A electric service. Max flow rates: 2.6 GPM, 3.1 GPM, 3.8 GPM, 5 GPM.
- Tempra® 29 Trend & Plus: DRAWS 120 A - Recommended minimum 200 A electric service. Max flow rates: 3.1 GPM, 3.7 GPM, 4.6 GPM, 6 GPM.
- Tempra® 36 Trend & Plus: DRAWS 150 A - Recommended minimum 300 A electric service. Max flow rates: 3.9 GPM, 4.6 GPM, 5.7 GPM, 7.5 GPM.
Fixture Flow Rates: Shower (1.5 GPM, typical range 1.5-2.5), Kitchen Sink (1.5 GPM, typical range 1.0-2.2), Bathroom Sink (0.5 GPM, typical range 0.5-1.0).
Note: Max. Flow Rates shown are correct if installed with 240V service. Increase one model size if unit will be installed with 208V service.
Performance Matters
Open the Cover on a Tempra® 24 Plus
A diagram shows the internal components of a Tempra 24 Plus unit, including:
- Hinged cover
- Safety thermal cut-off
- Solid copper heating element
- Temperature sensor
- Wiring block
- Flow sensor
- Temperature sensor
- Electronic control module
- Advanced Flow Control™ (Plus models)
- Filter screen
A Tempra has no mechanical switches and is completely silent while operating.
We've Been Introducing Advanced Technology Since 1924
Stiebel Eltron is proud to have invented electric tankless water heating technology. As the international leader, we continue to be the pioneer in the industry. Our engineering and manufacturing tradition of excellence means that you can depend on the performance and reliability of our products for many years to come.
Superior, Reliable & Quiet Performance
Each Tempra® has several temperature and flow sensors that feed their readings into the unit's proprietary microprocessor control. A Tempra continually monitors incoming water temperature and the water temperature it produces. It engages its heating elements in stages to achieve the water temperature you desire as efficiently as possible.
A Tempra also does not have any mechanical switches. It is completely silent while operating.
Technical Data
Tempra Whole House Electric Tankless Water Heaters - 100 Years of German Technology
| Tempra® Model | 12 Trend 239213 | 12 Plus 239219 | 15 Trend 239214 | 15 Plus 239220 | 20 Trend 239215 | 20 Plus 239221 | 24 Trend 239216 | 24 Plus 239222 | 29 Trend 239217 | 29 Plus 239223 | 36 Trend 239218 | 36 Plus 239225 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phase | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | single 50/60 Hz | |
| Voltage | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | 240 V or 208 V | |
| Wattage | 9 kW | 12 kW | 10.8 kW | 14.4 kW | 14.4 kW | 18 kW | 18 kW | 24 kW | 21.6 kW | 28.8 kW | 27 kW | 36 kW | |
| Amperage draw¹ | 50 A | 44 A | 2 x 30 A | 2 x 26 A | 2 x 35 A | 2 x 40 A | 2 x 35 A | 2 x 50 A | 3 x 40 A | 3 x 35 A | 3 x 50 A | 3 x 44 A | |
| Number & min. recommended size of circuit breakers² (DP) | 1 x 50 A | 2 x 30 A | 2 x 40 A | 2 x 35 A | 2 x 50 A | 3 x 40 A | 3 x 35 A | 3 x 50 A | 3 x 40 A | 3 x 35 A | 3 x 50 A | 3 x 44 A | |
| Number of runs & min. recommended wire size² (copper) | 1 x 8/2 AWG | 2 x 10/2 AWG | 2 x 8/2 AWG | 2 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | 3 x 8/2 AWG | |
| Maximum temperature increase above ambient water temp | @1.50 GPM 54°F | 41°F | 65°F | 49°F | 88°F | 66°F | 92°F | 82°F | 92°F | 92°F | 92°F | 92°F | |
| @2.25 GPM 36°F | 27°F | 43°F | 37°F | 58°F | 44°F | 73°F | 54°F | 87°F | 66°F | 92°F | 82°F | ||
| @3.00 GPM 27°F | 20°F | 33°F | 25°F | 44°F | 33°F | 54°F | 41°F | 66°F | 49°F | 82°F | 61°F | ||
| @4.50 GPM | 29°F | 22°F | 37°F | 27°F | 44°F | 33°F | 55°F | 41°F | 66°F | 49°F | 82°F | 61°F | |
| Min. water flow to activate unit | 0.37 gpm (1.4 l/min) | 0.50 gpm (1.9 l/min) | 0.50 gpm (1.9 l/min) | 0.50 gpm (1.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | 0.77 gpm (2.9 l/min) | |
| Weight | 13.5 lb (6.1 kg) | 16.1 lb (7.3 kg) | 16.1 lb (7.3 kg) | 16.1 lb (7.3 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | 19.0 lb (8.6 kg) | |
| Nominal water volume | 0.13 gal (0.5 l) | 0.26 gal (1.0 l) | 0.26 gal (1.0 l) | 0.26 gal (1.0 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | 0.39 gal (1.5 l) | |
| Max. inlet water temperature | 131 °F (55 °C) | ||||||||||||
| Dimensions | Width 16⁵⁄₈" (42.0 cm) x Height 14½" (36.9 cm) x Depth 4⁵⁄₈" (11.7 cm) | ||||||||||||
| Minimum pressure | 30 psi (2 bar) | ||||||||||||
| Working pressure | 150 psi (10 bar) | ||||||||||||
| Tested to pressure | 300 psi (20 bar) | ||||||||||||
| Water connections | ³/₄" NPT | ||||||||||||
| Uniform Energy Factor (UEF) | 0.94 | 0.96 | 0.97 | 0.97 | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 | |
| Recovery efficiency | 93% | 97% | 97% | 97% | 99% | 98% | 99% | 98% | 99% | 98% | 99% | 98% | |
Notes on Electrical Requirements:
- Depending on total electric load at the installation site, we recommend these minimums for main service: 100 A for Tempra 12 or 15 Trend/Plus; 125 A for Tempra 20 Trend/Plus; 150 A for Tempra 24 Trend/Plus; 200 A for Tempra 29 Trend/Plus; 300 A for Tempra 36 Trend/Plus.
- Overcurrent protection sized at 100% of load. Tankless water heaters are considered a non-continuous load.
- Copper conductors with a temperature rating of 75 °C or greater must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
- Tempra 29 Trend/Plus & Tempra 36 Trend/Plus may be wired for balanced 3-phase 208 V.
- Tempra 15 Trend/Plus, 20 Trend/Plus, 24 Trend/Plus may be wired for unbalanced 3-phase 208 V.
- These are our recommendations. Check local codes for compliance if necessary.
Certifications:
- Conforms to UL Std. 499
- Certified to CAN/CSA Std. C22.2 No.88
- Tested and certified by WQA against NSF/ANSI/CAN 372 for lead free compliance.
- ISO 9001 CERTIFIED
Warranty Information: 7 years leakage & 3 years parts. Complete warranty available online.
Company History:
In 1924, Dr. Theodor Stiebel designed the first coil immersion heater and founded "ELTRON Dr. Theodor Stiebel" in a small workshop in Berlin, Germany. Since then, Stiebel Eltron has manufactured 20 million electric tankless water heaters, holds hundreds of patents, has won more than fifty design awards, and continues to stay at the forefront of water heating technology.
Distributed by: STIEBEL ELTRON MFG CO
Contact Information:
STIEBEL ELTRON
17 West Street
West Hatfield, MA 01088
TOLL FREE 800.582.8423
PHONE 413.247.3380
FAX 413.247.3369
info@stiebel-eltron-usa.com
www.stiebel-eltron-usa.com
Due to our continuous process of engineering and technological advancement, specifications may change without notice. Printed on recycled chlorine-free paper with soy-based inks.
