Stiebel Eltron Tempra 12 Trend Tankless Water Heater

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Stiebel Eltron Tempra 12 Trend - 239213

MSRP: CDN$733.00
Our Price: CDN$659.00
You save: $74.00

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Stiebel Eltron Tempra 12 Trend - 239213

  • Description
  • Specifications
  • How it Works
  • Installation / Manual
  • Reviews
  • FAQ
  • Validations
  • Hard Water
Maximum Flow Rate in Gallons Per Minute at 105F Output temp
Incoming Water Temp: Flow Rate (GPM)
40F 1.3 GPM
45F 1.4 GPM
50F 1.5 GPM
55F 1.6 GPM
60F 1.8 GPM
65F 2.0 GPM
70F 2.3 GPM
75F 2.7 GPM
Stiebel Eltron Tempra 12 Trend (12 KW) electric tankless water heater is a popular and very economically priced thermostatically-controlled point-of-use tankless water heater used for low flow applications such as single sinks in restrooms, powder rooms, kitchens, low-flow pool house showers, emergency eyewash stations, etc. This model is not generally considered sufficient for whole house applications, even in warm climate areas.

Like all Tempra Series tankless water heaters, the Tempra 12 Trend features true microprocessor-controlled temperature regulation and dial selector which allows you to set the desired output water temperature at any level between 68 and 140F (20 and 60C).

It is one of the only tankless water heaters on the market that features a true thermostatic temperature control and full power-modulation based on both the incoming water temperature and the water flow rate.

The Tempra 12 Trend will automatically adjust its power output to accommodate changes in the incoming water temperature and flow rate so it can precisely maintain the desired output temperature. The result is the most precise temperature control of any tankless water heater on the market today!

Need help choosing a tankless water heater for your application.  Try our model selector.

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  • 12 kW's of Power
  • Thermostatically Controlled
  • Requires 100 Amp Service

Stiebel Eltron Tempra 12 Trend Specifications

Thermostatically Controlled? Yes, temperature control with full power modulation based on flow rate and incoming water temperature.
KW 12 KW @ 240v / 9 KW @ 208v
Voltage: 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps: 50 AMPS @ 240v / 44 AMPS @ 208v
Breaker Required:*  50 AMP (240 volt, double pole breaker)
Wiring:*  Minimum #8 AWG Copper
Dimensions: 16.6 x 14.5 x 4.6" (42.0 x 36.8 x 11.7 cm)
Weight: 13.2 lbs (6.1 KG)
Pipe Fittings:  3/4" NPT
Energy Efficiency: 99%+
Activation Flow Rate: 0.37 GPM / 1.4 LPM
Max. Water Pressure:    150 psi
Warranty: 7 years against leakage / 3 years against defects in workmanship & materials
Safety: ETL Listed (US & Canada) - meets all applicable standards, including ANSI/UL 499 (USA) and CSA-E335-1/3E-94 (Canada)
Protection: microprocessor-based thermostatic temperature control (flow rate and temperature modulating) with thermal hi-limit cut-out switch monitoring each heating module
GTIN: 0094922100603

* Breaker size and wire gauge must meet all applicable local, state, provincial, and national electrical codes for your area - these are only guidelines that will apply to most installations. Some codes require use of electrical sub-panel for installation, especially when heater is not mounted within line-of-sight of the main electrical panel. Wiring should be sized to maintain a voltage drop of less than 3% under load. Please consult your electrician for more details.

How it works

The Stiebel Eltron electric tankless water heater is a marvel of technology and engineering - overflowing with technology, yet packaged in an intelligent, simple design. It heats water entirely on demand, only when it is needed.

When a hot water faucet is turned on and the water begins to flow, a sophisticated flow sensor detects that hot water is being demanded and turns the water heater on. Instantaneously, a series of sensors gather information about the flow rate of the water and the incoming water temperature. This information is sent to a microprocessor which calculates the amount of power needed to heat the water to the temperature set point. The water flows through the internal heating modules and exits the unit at the desired temperature. The start-up process takes a couple of seconds. A convenient thermostatic control on the front of the unit allows the homeowner to select an output temperature between 86 and 140F (30 to 60C) [Note: some models are designed for maximum output of 125F (52C)].

The sensors continue to monitor the water flow rate and incoming water temperature as long as the water is running. They constantly send data to the microprocessor so power to the heating elements can be modulated in accordance with changes in incoming flow rate and temperature. If, for instance, the flow rate increases because a second demand for hot water in the home is initiated, the unit will increase its power output to maintain a consistent and precise output temperature.

The tankless water heater will remain on until the hot water faucet is closed. As soon as the flow sensor detects that water has stopped flowing, the power to the unit is completely turned off.

All Stiebel Eltron Tankless Water Heater Tempra Trend Series water heaters are manufactured in Germany in one of the world's only ISO-9001 certified tankless water heater manufacturing plants by a company that has been around since 1924!

Please see the internal views of the Stiebel Eltron Tankless Water Heaters below for more details. All of the models utilize the same parts and technology, but have varying sizes and numbers of heating modules.

Inside View of Stiebel Eltron Tempra 24 Electric Tankless Water Heater

*Note: The Tempra 36 Trend and Tempra 29 Trend
have 3 heating modules.
Electronic Control Module Electronic Control Module
Sophisticated microprocessor-controlled electronics adjust the power output of the heating modules based on flow rate and incoming water temperature to precisely regulate the output water temp.
Heating Module Heating Module
The muscle of the system! A series of very high output heating modules (up to 3, depending on model) are used to heat the water as it passes through the heating chambers of the water heater. Each heating module features multiple heating elements. The heating chambers are manufactured with copper - no cheap plastics here!
Sensors Flow Sensor
A sophisticated flow rate sensor delivers important data to the microprocessor on a continuous basis - this data is used by the microprocessor to calculate the power level of the heating modules that is necessary to heat the water to the set temperature.
Safety Thermal cut-off Safety Thermal cut-off
Safety first! Each heating chamber is protected by thermal limit switch, a back-up safety feature that will automatically turn off the heating module if a potentially unsafe output water temperature is reached. This reduces the risk of scalding injuries for children and the elderly, and protects the unit from damage if the microprocessor-based thermostatic control fails.
Digital Display Temperture Selector
Set it and forget it - use the simple dial control to raise or lower the temperature setting. The temperature can be set at any level from 86F (30C) & 140F (60C) [up to 125F or 52C on Tempra 12, 15, and 20]
(Not pictured).
Temperature Sensors Temperature Sensors
Working in conjunction with the flow sensor, a series of temperature sensors deliver important data to the microprocessor on a continuous basis so that the unit can acurately maintain the set output water temperature.
Wiring Block Wiring Block
Convenient terminal blocks are provided to ensure a quick, simple, and safe installation. Installation by a licensed electrician is highly recommended.
Hinged Case Sturdy Hinged Steel Case
All Stiebel Eltron Tempra Trend Series water heaters are housed in a sturdy steel case with built-in wall mounting brackets. Many competitors use flimsy light-gauge aluminum cases or even plastics. Tempra Trend models feature a convenient hinged case for easy access.
Inlet Water Filter Inlet Water Filter
The inlet water pipe includes a small screen filter that ensures that no debris is able to enter the system. This filter can be periodically cleaned for optimal flow performance.

Stiebel Eltron Tempra 12 Trend - 239213 Reviews

Owner5 Stars
excellent product. easy to operate, user friendly - Chep Hon

Great Replacement5 Stars
We had another manufacturers units for 10 or more years. Those units had plastic heat chambers that both began to leak at a mold seam. I chose the Steibel unit primarily because of the copper tank. The instillation was very easy and the single unit is able to keep up with our DHW needs. My only comment is that I wish E-Tankless Water Heaters had offered a faster shipping method. I would have gladly paid extra to have the unit faster than the 2 weeks it took to get it from BC to NB. I should have inquired about shipping options. We were looking at Christmas without hot water, thankfully the unit arrived on the 23rd and I was able to install it the next day. Could not be happier with the overall experience and product. - Richard Harris

Other Tempra Trend Series Reviews

Hot water 5 Stars
We love our Stiebel Tempra 20. Have paired it with a Hague water softener and are very pleased with the result. - Sandpiper

Tankless water heater 5 Stars
Good product, had previously purchased from Tankless in Florida, which worked well for 8 years. Installation not to difficult, following the instructions. I chose product for good price and European experience with good workmanship. hope this one will last long. - Roger

tankless hot water heater5 Stars
I got it very fast and we replaced our old one of many years, It works great, no problems. - john c

Tempra 29 Tankless Heater5 Stars
Simple to install (already had electrical in place), performs as advertised. So far, very pleased. - Bob P

Steibel 15 4 Stars
Installed the unit according to the directions and it did not work at first. I think because the water pressure needed time to reach normal in the unit. It now works fine to heat our master bath fixtures - Stephen K

E Tankless Water Heater 5 Stars
Love it, works great & company very helpful when ordering. - Janice

Great heater5 Stars
When my home was built 25 years ago, this was the hot water heater. You might be thinking that a hot water heater should justifiably last an easy 25 years. I have well water, and 1 filter before the heater. This statement says more. I absolutely had to get the same one. It is a little taller so a tiny bit of plumbing and tada, easy to install. I am pretty old fashioned so the extra options are not important to me, but all I did was set it to 110 degrees with the dial, done. In 25 years I will get another if it is needed. I had a GE tank break after 2 years and the insurance stuck it to me. Personally I am so very sick of garbage on the market. This unit in my home has a proven track record and I am all about proof. - Steve A

stiebel eletron tempra 15 trend tankless water heater5 Stars
Heater is working flawlessly. Excellent quality. Very good instructions for installing heater. The unit is for one full bathroom (tub and sink). I live in southern Maryland and the water heater keeps the water a constant 115 degrees at 2.8GPM with no issues. Thanks - Vincent Beatrez

Finally we have UNLIMITED Hot Water, Thank you e-tankless!5 Stars
Our water heater is in the garage and our Master Bath is on the other side of the house. We have a Taco recirc pump but our 66 gallon water heater tank couldn't provide enough hot water for long relaxing showers. We bought the 29B (refurb) from e-Tankless. It looked brand new, came in the original packaging. It was fairly expensive ($2,100 USD) to run new 125A service to support this water heater but I am so glad we did. We now have endless hot water! I would recommend buying the isolation valve kit so you can easily flush the unit annually. I would highly recommend e-tankless! - Todd Simmons

Worth it5 Stars
My old waterheater was in my attic which daily made me nervous to have 50 gallons that could leak at any time. I upgraded to tankless and I am very impressed the hot water works better much better now. - Shawn Lawson

Tankless5 Stars
Tankless So far it’s working great. If it goes well I will order four more for my other units - Mario Tridente

Excellent solution for on demand hot water5 Stars
This purchase is a replacement for the previous model of the same specs we had installed in our condo about 15 years ago. The electrical elements do wear out in about 15 years, so we installed a replacement unit. The new unit is smaller and has a better screen than the old one. It works wonderfully, and we are just as happy with this one as we were with its predecessot. -

Replacing on older Steibel Eltron unit4 Stars
After about 15 years of faithful service my older model Steibel Ultron tankless water heater stopped heating the water effectively (lime scale). This new unit (Tempra 29) is the newest edition of the prior model. No issues installing although the size and spacing of the water inlets/outlets differed meaning a little extra work. New unit works like a charm now - Jeff

Stiebel-Eltron Tempra 29B5 Stars
Great price and great service. I installed it right away and it has been working flawlessly for a month now. - Master DIYer

Stiebel Eltron Tempra 12 Trend - 239213 Customer Questions & Answers

Question:Can the unit be mounted outside of home?

None of the Stiebel Eltron Tempra series tankless water heaters are weatherproof so they can't be mounted outside the home without a weatherproof enclosure. They also need to be kept above freezing to prevent damage to the heater.
By E-Tankless on Feb 27, 2024

ETL Listed - USA & Canada!
All Stiebel Eltron Tempra Trend tankless water heaters are ETL Listed in the USA and Canada, ensuring they conform to all applicable safety standards.
WQA Certified - USA & Canada!
All Stiebel Eltron Tankless Water Heaters are tested and certified by WQA against NSF/ANSI 372 for "lead free" compliance.
Comprehensive 7 year manufacturer's warranty against leakage / 3 year against defects in workmanship & materials. See warranty for details

Stiebel Eltron is:
Stiebel Eltron is ISO-9001 Certified

Do You Have Hard Water?

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If your water hardness trends above 7 grains per gallon (GPG) or 120 mg/l (ppm), you should consider hard water treatment prior to your tankless water heater. If your hardness exceeds 12 GPG or 200 mg/l (ppm), hard water treatment is strongly recommended.

Hard water treatment helps maintain performance and efficiency, ensures optimal water flow and pressure, and protects your heater from pre-mature failure due to mineral build-up inside the heating module and other components.

Please note: A minimum 100 AMP household electrical service is highly recommended and will likely be required to install this model. If you are unsure of your electrical capacity in your home, please consult your electrician or contact us for assistance before ordering.