Stiebel Eltron Tempra 29 Plus - #239223

Stiebel Eltron Tempra 29 Plus - 239223

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Stiebel Eltron Tempra 29 Plus - 239223

  • 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 3.0 GPM
45°F 3.3 GPM
50°F 3.6 GPM
55°F 3.9 GPM
60°F 4.4 GPM
65°F 4.9 GPM
70°F 5.6 GPM
75°F 6.5 GPM
The Stiebel Eltron Tempra 29 Plus electric tankless water heater is a powerful 28.8KW heater designed for whole house and commercial applications in cold climates where the incoming water temperature can drop below 40° F. It is also a popular choice for homes in warmer climates with high flow demands where multiple simultaneous hot water demands are required (up to 6 gallons per minute), or where fast fill rates for large Roman or bath tubs is desired.

Like all Tempra Plus Series tankless water heaters, the Tempra 29 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 29 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 29 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
  • 28.8 kW's of Power
  • Thermostatically Controlled
  • Requires 200 Amp Service

Stiebel Eltron Tempra 29 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): 28.8 KW @ 240v / 21.6 KW @ 208v
Voltage: 208 - 240 volts / single phase / 50 - 60 Hz
Max. Amps: 120 AMPS @ 240v / 105 AMPS @ 208v
Breakers Required:*  3 x 40 AMP (240 volt, double pole breakers)
Wiring:*  Minimum 3 x #8 AWG Copper
Dimensions: 16.6 x 14.5 x 4.6" (42 x 36.8 x 11.7 cm)
Weight: 17.6 lbs (8.6 KG)
Pipe Fittings:  3/4" NPT
Energy Efficiency: 99%+
Activation Flow Rate: 0.77 GPM /2.9 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: 0094922100689

* 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 29 Plus - 239223 Reviews

Excellent unit working with Solar Thermal Hot Water 5 Stars
Purchase and installed my unit in April 2015; wanted to wait a full year before making a review. In a small utility/laundry room I replaced my 40gal electric hot water storage tank with a 60gal storage tank for storing solar thermally heated water. I did not have room for 2 tanks so I decided to go tank less water heating. I reviewed options when professional advise given to me was to go natural gas, but decided after careful study to go with the Tempra 29 PLUS. The savings I am making by preheating my domestic water with Solar Thermal collector panels is showing up as 8kwH/day and the Tempra 29PLUS kicks in when there has been no sun for several days. I have the Tempra set high at 128 and my my solar thermal storage tank set at max temp of 175degF; there are no issues with water at 175degC passing through just does not power on. When there is no sun for several days the Tempra can handle both showers in the home being used at the same time with no issues, and my hydro bill does not kick upwards. A little more expensive to install than a condensing natural gas tankless, but if you have space challenges and cannot get flues out through a wall then this E-tankless is a great way to go, especially with Solar Thermal Hot water preheating. - David F

Very reliable performance 5 Stars
We installed our Tempra 29 Plus in 2010 and the unit has worked flawlessly since we've owned it. The odd time, we'll adjust the temperature up or down a few degrees, but it has been hanging on the storage room wall untouched for the most part. The heating is very even in the shower and for washing dishes. No temperature fluctuations at all. Other than some fixtures that are a long way away from the heater, the water is heated and arrives as the faucets very quickly. For dishwasher loads (and if there's a hot load of laundry) we always run the closest sink until we get hot water and then turn on the wash cycle. In terms of operating costs, the household hydro bill is slightly higher, but very reasonable. Our gas bill has probably decreased more than enough to offset the increase in hydro. This unit has been very efficient for our family and still operates as well now as it did the day we put it into use. Would definitely recommend this efficient heater to other people here in B.C. or other parts of the country. - Josh

Excellent Water Heater5 Stars
Excellent water heater. The plumber said it was easy to install. Super tech support, documentation was first rate. But the most important there is plenty of hot water, and no huge tank in the garage any longer. - Pedro

Replacing 10 year old tankless 5 Stars
Saved us money the first month with more efficient operation than our old tankless unit, newer tech very happy with this - B Bailey

Tankless electric water heater. 5 Stars
Works as expected. - Andrew

Great Product - Could be better though4 Stars
I am very happy with our conversion to tankless. This product is outstanding; well-built and works as advertised. However, I wish the flow detection switch was either more sensitive, or user adjustable. As is, you have to turn the hot water on to a pretty high rate of flow for the heater to kick on. This is fine for most uses, but for things like shaving, where I would normally turn the water on at a slow rate, the flow is not detected by the heater. I turn the water up to solve this, but can't help thinking about the amount of water that is being wasted. One of the reasons I converted is wasted energy on a tank, and now it seems the waste was just shifted to water use. - Ken S

Exceeded my expectations5 Stars
I installed the water heater in February in Saint Paul, MN. My water temperature coming from the street is probably in the forties Fahrenheit. It is cold enough to make your hands numb. I was a little worried that it wouldn't have enough capacity for my family of 6 with 4 bathrooms. It is working just fine. After some experimenting, we ended up setting the temperature at 115. We can easily take 2 showers at the same time. If the washer and dishwasher are going at the same time, the 3rd floor shower will decrease flow to a trickle without changing temperature. I am very happy so far. I installed it myself. I have a 200 amp service so I had room for the necessary 3 separate 30 amp 220 volt circuits. Some electrical items in the house will exhibit a little fluctuation when the heater kicks in, although it is pretty subtle. Hopefully it continues this performance over the long haul. If it lasts 15 years with this performance, I will be very happy. - John S

Fantastic!5 Stars
The heater is extremely easy to install. It is is even easier to operate. It worked perfectly the moment it was commissioned and performs the same on every use. The water is hot more quickly and it is great to have an endless supply of hot water. E-Tankless was a great resource, responsive, and shipped the heater quickly. They are a fantastic company with great quality products and service. - David Tishim

Performance5 Stars
We have had our tankless heater for over 6 weeks and it has not failed to produce all the hot water (128 degrees). Several showers at once and a washing machine. Very impressed. Have noticed a slight increase in electric bill but, it's worth it to not have to worry about running out of water! - J. Norton

5 Stars
- Rusty W.

5 Stars
Love my new water heater, light years ahead of my old Sets system. User instructions could be a bit better as could install instructions. Should mention a flushing system should be installed at the same time to get rid of calcium.. - G. Martin

So Far so good 3 Stars
Im in CA and I replaced it in the summer, so far it was easy to install, and easy to work with, I will know if it is the perfect unit when winter comes and the inbound water is colder but so far so good. - Burke Race

overall4 Stars
So far it is excellent - Oscar Henry

Perfect so far5 Stars
I purchased a Tempra Plus water heater and had it installed by Professional plumber/electrician and it works perfect so far. - Mircea Micula

Etankless 5 Stars
Love it. Very good quality - A Creation By Mario

Second one.5 Stars
Everything was find, this is our second one. We have that on a process. Your service was excellent, Thanks again - Eric L

Excellent product and service5 Stars
This is a wonderful product, engineered to German precision specifications. I highly recommend it, and the price was better than anything I could find anywhere else. The service I received was superb and I could not recommend this company any more strongly. Highly professional, courteous, friendly, and full of relevant information. I was impressed from the beginning of the transaction to the very end. I wouldn’t hesitate to make a purchase. Great service and products. - Daniel

Quality Service5 Stars
The unit is performing wonderfully—but just as important was the expert advice and support that I received from Grant Robertson at E-Tankless - Janice B

Great tankless water heater5 Stars
Excellent product and excellent support team, thank you! - Gary R Lamarand

A Homemaker’s Dream! (Big Family)5 Stars
We are a family of 7 and this has been a game changer for us. There are several improvements I’ve noticed since switching from a traditional hot water tank to this system- 1) it’s foot print is dramatically smaller. In fact, it’s not much of an actual foot print at all since it hangs up on the wall out of the way. 2) I hand wash all of our dishes (3 meals a day as I stay home with our kids) so we have an industrial kitchen sink. Before we got this water heater, I used to have to use one tank of water to fill the sink and then wait a bit to come back and finish washing/rinsing. Not anymore! Now I can do a sink FULL of dishes in one shebang. 3) Before, I could either start a load of clothes OR wash dishes… this is no longer a problem either! I can do both at the same time now! With so many kids (5), anything that makes my life easier (more productive, more simple, etc.) is a big win in my book! And this system is a BIG WIN in my book!!! I’ve already recommended it to several other big families we attend church with and really anyone else that comes over to see the progress we’ve made on our new laundry room (where it’s located in our home). I love it!!! In terms of installation, my husband did it himself. He works construction but plumbing is not his forte but it was simple enough for him to install. But a simple service call with a plumber would suffice, for sure. Ordering, shopping, customer service, etc. with this company have all been wonderful too. Everything has just been great! - Love it!

So far so good4 Stars
Original unit came with a leak and I asked for express shipping for replacement but got standard shipping which was a headache. You must be very careful with inlet valve and not get any thread sealing product on inlet spinner. In general it seems to be a will built unit, however time will tell!! - Jim Boyd

Great product.5 Stars
Direct replacement for my 3 40amp setup. It's performance far exceed that of our previous unit with constant temperature and no variations. Handling whole house with no problem. - James Lansbery

Stiebel Eltron Tempra 29 Plus - 239223 Customer Questions & Answers

Question:I have 150 amp service to my home. Can I install the Tempra 29 Plus?

At full power the Stiebel Eltron Tempra 29 Plus can draw up to 120 AMPS of power which would only leave you 30 AMPS for the rest of your home. In order to make sure you have sufficient power to cover the rest of your home a minimum 200 AMP electrical service is recommended.
By E-Tankless on Sep 14, 2023

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 200 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.