Stiebel Eltron Tempra 29 Plus

Stiebel Eltron Tempra 29 Plus Review

Read time: 6 minutes Last Updated: 09/10/2019

Stiebel Eltron Tempra 29 Plus

  • Near-perfect 99% energy efficiency rating back by several certifications
  • Sleek exterior redesign includes a user-friendly interface and display
  • Intelligent self-modulating technology prevents water and electricity waste
  • Requires only 3 separate dedicated 40 Amp DP breakers to operate optimally
  • Some units suffer from faulty wiring that shorten lifespan noticeably
Dimensions & Capacity:
4.6 x 16.6 x 14.5 inches
Fuel Type:
Flow Rate & Water Pressure:
6 GPM (peak)
Heating Capacity:
68°F to 140°F
Energy Efficiency Ratings & Certifications:
99%; UL certified, CSA listed, and ETL listed
Display Type:
Material Composition:
Our Review

The Stiebel Eltron Tempra 29 Plus has a slightly higher than average rating, which feels well and justified given its implementation of several innovative technologies that can prevent undesirable water or electricity waste. When paired with a 99% energy efficiency rating backed by UL, CSA, and ETL, we simply couldn’t deny this model one of the top billings in the tankless water heater market.

If the Stiebel Eltron Tempra 29 Plus caught your eye while comparison shopping, you certainly wouldn’t be alone. This model’s redesigned exterior allows it to seamlessly blend into any modern home décor while still providing user-friendly access to its controls and interface. As a result, you’ll never have to worry about bringing attention to this tankless unit while you adjust its 68°F to 140°F heating capacity range.

The Stiebel Eltron Tempra 29 Plus’ various technological innovations cannot be ignored either, simply because no other model in its class offers anything comparable. These innovations include an “Advanced Flow Control” module (which moderates hot water releases during high demand scenarios) and an intelligent self-modulating module (which monitors electricity usage to prevent unnecessary waste).

All these considered, we gave the Stiebel Eltron Tempron 29 Plus an overall score of 8.5/10 and the title Sleekest Tankless Water Heater under $800.

Read more about our how our ratings broke down for the Tempra 29 Plus below or checkout how it compares to other whole house tankless electric water heaters.

Why Might I Want this Specific Tankless Water Heater?

Simply put, if you are looking for a premium in-home hot water production experience, then the Stiebel Eltron Tempra 29 Plus is for you. This model has taken the best features of many of its competitors—such as a dual chamber heating system and near-perfect energy efficiency rating—and combined them into a single affordably priced unit. Those that previously disliked the old Stiebel Eltron Tempra 29’s analog interface will also be happy to know that this reengineered model makes use of a sleek new digital interface that is far easier to engage with.

Key Specifications and Features to Look for in a Tankless Water Heater

Dimensions & Capacity

For many years, tankless water heaters were difficult to install due their physical size and their necessity for installation space. Modern models like the Stiebel Eltron Tempra 29 Plus, though, are exceptionally sleek and compact, allowing them to be installed with a greater degree of proximity to a high-demand location. This more streamlined design doesn’t affect this model’s capacity, either, because it (like all tankless units) lacks an internal capacity in the first place. For its sleek design and space-saving size, the Stiebel Eltron Tempra 29 earns a 9/10 in our book.

Fuel Type

Across the board, tankless water heaters rely on electricity, natural gas, or propane as a fuel source. Each of these fuel types have their own advantages and disadvantages, especially when it comes to installation and ongoing supply costs. The Stiebel Eltron Tempra 29 Plus makes use of one of the most nationally affordable fuel sources, electricity. As such, most homeowners can select this model without spending a ton on installation up front. We give it an 8/10 in this category.

Flow Rate & Water Pressure

A tankless unit’s flow rate describes how rapidly water travels through its core systems, from inlet to outlet. Typically, flow rate is measured in gallons per minute (GPM). Furthermore, it can have a direct influence on an outlet’s water pressure depending on the unit’s proximity to the outlet. The Stiebel Eltron Tempra 29 Plus’ flow rate can reach up to 6 GPM, which is more than enough to maintain water pressure in an extended proximity installation orientation. The Stiebel Eltron Tempra 29 Plus’ Advanced Flow Control feature ensures a constant temperature output no matter how great the hot water demand is in your household. For that, we’re giving it an 8.5/10.

Heating Capacity

All tankless units include a heating capacity in their listing in order to communicate their core heating capabilities. More specifically, these temperature ranges illustrate the full scope of temperatures to which that unit can heat groundwater during peak performance. The Stiebel Eltron Tempra 29 Plus, for example, features a 68°F to 140°F that remains stable even as demand increases. We’re confident in the Stiebel Eltron Tempra 29 Plus’ capability of providing an endless supply of water with no temperature fluctuations, which is enough to earn it an 8/10.

Energy Efficiency Ratings & Certifications

Many tankless water heaters are built with energy efficiency in mind. The Stiebel Eltron Tempra 29 Plus is a prime example of this, given that it makes use of an industry standard method of communicating a unit’s ability to convert its fuel into heat. In fact, this model carries a 99% efficiency rating, which is remarkable in its own right. Better yet, this model is UL certified, CSA listed, and ETL listed. For its near-perfect efficiency rating, we’re giving it a near-perfect rating of 9/10.


The Stiebel Eltron Tempra 29 Plus’s 3-year warranty for parts is a major added-value feature for this model. That long a coverage is enough to give any user peace of mind, so we’re giving it a rating of 8.5/10.

Display Type

Of course, you should expect to interact with your tankless water heater regularly. If this process is a hassle (as it often is with analog unit interfaces), you’ll find yourself liking your tankless unit less and less. That won’t be a problem with the Stiebel Eltron Tempra 29 Plus, though, because its digital interface is among the most visible and user-friendly in its class. We’re handing it a 9/10 in this category.

Material Composition

More than its sleek looks and premium materials, the Stiebel Eltron Tempra 29 Plus maintains a low environmental profile with its fully recyclable major components. The solid copper chamber is also burn proof. These things considered, we’re giving it a rating of 8/10.

Different Uses for a Tankless Water Heater

Decentralized In-Home Water Heating

Though the methodology is still fairly new, more and more homeowners are finding that a decentralized hot water production system is well suited to meeting their home’s needs. For example, each module in a decentralized system is easier to install near a high-demand outlet point. This, in turn, cuts down on outlet response times. Also, a decentralized system is easier to maintain due to a decreased reliance on any one appliance for the entire home’s hot water.

Cutting Water and Electric Bills

Every homeowner spends countless hours in search of simple ways to save money on their monthly utility bills. As it turns out, a tankless water heater like the Stiebel Eltron Tempra 29 Plus is a great way to accomplish this goal. The Stiebel Eltron Tempra 29 Plus in particular excels in this category because its patented “Advanced Flow Control” system allows it to more sustainably control its output and hot water production during peak demand scenarios.

Comparing the Stiebel Eltron Tempra 29 Plus to the Competition

Stiebel Eltron Tempra 29 Plus vs. EcoSmart ECO 27

In terms of electricity demand, both the Stiebel Eltron Tempra 29 Plus and the EcoSmart ECO 27 require between 27 and 29 kW on average. However, these models differ when it comes to performance and price. The Stiebel Eltron Tempra 29 Plus is the winner in the performance category due to its 6 GPM peak flow rate, while the EcoSmart ECO 27 comes in at several hundred dollars cheaper than its competitor.