Stiebel Eltron Tempra 15 Plus - #239220

Stiebel Eltron Tempra 15 Plus - 239220

MSRP: US$879.00
Our Price: US$630.00
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Stiebel Eltron Tempra 15 Plus - 239220

  • Description
  • Specifications
  • How it Works
  • Installation / Manual
  • Reviews
  • FAQ
  • Validations
  • Hard Water
Maximum Flow Rate in Gallons Per Minute at 105°F Output temp
Incoming Water Temp: Flow Rate (GPM)
40°F 1.5 GPM
45°F 1.6 GPM
50°F 1.8 GPM
55°F 2.0 GPM
60°F 2.2 GPM
65°F 2.4 GPM
70°F 2.8 GPM
75°F 3.3 GPM
The Stiebel Eltron Tempra 15 Plus electric tankless water heater is the smallest Plus Series heater that we typically use for whole house applications. This 14.4 KW unit is generally recommended for warm climate regions including the southernmost regions of the U.S. (i.e. Southern California, Texas, Florida, etc.), as well as Mexico, and the Caribbean. It is best suited to regions where the coldest incoming water temperature is 65° F or greater. The Tempra 15 Plus is also a popular point-of-use tankless water heater for low flow applications in cooler climates.

Like all Tempra Plus Series tankless water heaters, the Tempra 15 Plus features true microprocessor-controlled temperature regulation as well as a convenient digital temperature display 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 15 Plus 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 Tempra 15 Plus also features Stiebel Eltron's exclusive dynamic Advanced Flow Control technology. This technology automatically adjusts the flow of water when the unit's sensors detect that the flow demand is exceeding the heater's capacity. This feature is particularly useful in cold climates and other applications where the electrical service size does not permit the installation of a larger model and it may be desirable to handle occasional high flow demands. It is also desirable where high output temperatures are required for temperature critical applications (commercial dishwashers, etc.) and where flow rates are not always predictable.

Dynamic Advanced Flow Control technology

Dynamic Flow Control Technology
exclusive to Tempra Plus tankless water heaters!
Need help choosing a tankless water heater for your application.  Try our model selector.

Simply stated, the Stiebel Eltron Tempra Plus Series electric tankless water heaters feature the most precise temperature control of any tankless water heater on the market today!

  • Digital Display
  • Flow Control Technology
  • 14.4 kW's of Power
  • Thermostatically Controlled
  • Requires 100 Amp Service

Stiebel Eltron Tempra 15 Plus Specifications

Yes, digital temperature control and full power modulation based on flow rate and incoming water temperature.
Advanced Flow
Control Technology?
Yes, dynamic flow control technology automatically adjusts the flow of water when the unit's sensors detect that the flow demand is exceeding the heater's capacity. This feature is exclusive to Stiebel Eltron Tempra Plus Series tankless water heaters!
Preset Temperature Memory Buttons: Yes
Flow Rate Monitor: Yes
Energy Monitor Showing Cost Savings: Yes
Hinged Case: Yes
Power (KW): 14.4 KW @ 240v / 10.8 KW @ 208v
Voltage: 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps: 60 AMPS @ 240v / 52 AMPS @ 208v
Breakers Required:*  2 x 30 AMP (240 volt, double pole breakers)
Wiring:*  Minimum 2 x #10 AWG Copper
Dimensions: 16.6 x 14.5 x 4.6" (42 x 36.8 x 11.7 cm)
Weight: 15.4 lbs (7.3 KG)
Pipe Fittings:  3/4" NPT
Energy Efficiency: 99%+
Activation Flow Rate: 0.50 GPM / 1.9 LPM
Max. Water Pressure: 150 psi (tested to 300 psi)
Max. Output Temperature: 140F (60C)
Max. Input Temperature: 131F (55C)
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: 0094922100634

* 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 and Tempra Plus 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 Plus Electric Tankless Water Heater

*Note: The Tempra 36 Plus and Tempra 29 Plus
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. Tempra Plus series are equipped with a digital temperature setting display. 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.
Flow Control Flow Control
Exclusive to Tempra Plus models, the dynamic Advanced Flow Control system will adjust the flow rate of the water if the microprocessor detects that the flow rate exceeds the capacity of the system. The result is the most precise temperature control of any tankless water heater on the market today! Ideal for applications where simultaneous hot water applications occassionally exceed normal model flow rate capacities.
Hinged Case Sturdy Hinged Steel Case
All Stiebel Eltron Tempra and Tempra Plus 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 Plus and 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 15 Plus - 239220 Reviews

5 Stars
It works as advertised. We are very pleased. - Tom M.

A Really GREAT Product!5 Stars
I had 3 or 4 other tankless water heaters before I got my first Stiebel Eltron Tempra. All of them failed after a very short while. Then I got my first Stiebel! This thing was amazing! It worked like a charm ... every time for months. I had to send it back for repairs because I didn't realize how hard my water really was (it clogged) and got another Tempra 15 to use while the first one was refurbished. I LOVE the digital temp. control. I just set the temp. at ideal for my shower and never turn the cold water on. One hint: every few months I circulate food grade vitamin C thru the water heater for about an hour using an aquarium pump. That keeps it from getting clogged with minerals and you don't have to use caustic chemicals. This is my third Stiebel Eltron Tempra Plus (the other 2 were lost in a house fire) and I couldn't recommend it more highly. - David C.

I screwed up, they helped5 Stars
This is a hard review for me to do, as I screwed up. I had two 30 amp breakers and they had the only good looking tankless for a 2 x 30 amp. I ordered it, that was fine, I got the unit and it was in great shape. The install was very easy. My problem was that my 30 amp breaker was only one wire (per breaker) not two as need for the unit too work. Yes, this was in the product literature. So, I screwed up I did not have the right wiring for the unit to work properly. I was able to return the unit. The return went smoothly and well. So if I have any needs for a tankless hot water heater in the future with proper electrical lines I will not hesitate to order from them again. - Mike Berman

excellent water heater5 Stars
This water heater is extremely good quality and pumps out tremendously HOT water-actually too hot, I had to turn it down so as not to burn us!! - Marshall Swanberg

WORTH EVERY PENNY. Great product!5 Stars
Easy to install, looks good and hot water within 10 seconds. This is a very good & efficient on demand hot water heater. It was a bit pricey but worth every penny! - Michael

So far, so good5 Stars
I bought this specific product because it used the maximum voltage available considering my residence's electrical setup (briefed by my electrician here). Water gets sufficiently hot for all purposes, but the heater cannot supply adequately more than one outlet at a time, for the water flow gets too low. I haven't yet used it in wintertime and look forward to seeing if it will be able to heat up the icy cold water. But so far, product is as advertised and satisfactory. - Daniel Bertrand

Stiebel Eltron Tempra 15 Plus - 239220 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 and Tempra Plus 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.