Stiebel Eltron Tempra 24 Plus Review

Read time: 7 minutes Last Updated: 10/31/2019

Stiebel Eltron Tempra 24 Plus

  • Advanced Water Control system exclusively available in this enhanced model
  • Heating chambers are both made from solid copper
  • Auto-modulation and internal sensors help to cut down on electricity waste
  • Made in Germany
  • Flow sensors may require replacement after a year or two
  • Does not handle hard ground water effectively
Dimensions & Capacity:
4.6 x 16.6 x 14.5 inches
Fuel Type:
Flow Rate & Water Pressure:
5 GPM, 150 PSI
Heating Capacity:
86°F - 140°F
Energy Efficiency Ratings & Certifications:
“15–20% less” energy use compared to conventional water heater
Price and Warranty:
Under $650, 7-year warrant against leaks and 3-year warranty on all components
Display Type:
Material Composition:
Our Review

The Stiebel Eltron Tempra 24 represents another important step forward for a tankless water heater line that was already eminently popular with American homeowners. This model, in particular, took a firm leap forward technologically by way of its “advanced flow control” system. Though you’ll rarely ever notice it in action, this system is designed to slightly decrease hot water flow as demand increases. This, in turn, decreases overall output volume and cuts down on the need to supplement said hot water with undesirably cold water.

Along the same lines, the Stiebel Eltron Tempra 24 places a heavy emphasis on providing users with a “variable flow” and “steady temperature” with each use. This model is able to accomplish this high performance standard, in part, through the implementation of “electronic temperature control.” Through the use of microprocessors and sensors, this system is able to adjust output temperatures based upon self-analysis (in addition to simplified user interaction on the digital display).

Read more about our how our ratings broke down for the Tempra 24 Plus below or checkout how it compares to other whole house tankless electric water heaters.

Why Might I Want this Specific Tankless Water Heater?

Like all tankless water heaters, the Stiebel Eltron Tempra 24 is modular in nature, allowing a prospective user to install it in proximity to their most in-demand hot water outlets. The Stiebel Eltron Tempra 24 is able to accomplish task through a series of heat exchanger components, including two extra-wide copper heating chambers.

However, the Stiebel Eltron Tempra 24 includes several features that have made it the center of attention in its size class. For example, this model makes use of a proprietary “advanced flow control” system that allows the entire unit to better regulate its own water pressure and distribution rate. As systematic demand rises, this mechanism is also able to maintain output water temperatures without the need to introduce cold water into the equation.

The Stiebel Eltron Tempra 24 also features a unique electronic temperature control system, which itself incorporates a series of sensors and smart microprocessors. The end result of this inclusion is a tankless water heater that is better at modulating its own processes and decreasing the need for routine user adjustment, in turn.

Quick Tips

Picking out a new tankless water heater before a quick DIY session can be challenging, at best. Though there are a variety of core specifications you should take into consideration before committing to a given model, these following quick tips should guide you to isolating the two or three models you’ll compare to the Stiebel Eltron Tempra 24:

  • Evaluate the Installation Space – Above all else, you must pre-measure your intended installation space. Otherwise, you may find it unsuitably sized to fit your chosen unit with all of its hookups attached. The Stiebel Eltron Tempra 24 clocks in at 4.6 x 16.6 x 14.5 inches, making it as practical for wall mounting as an in-cabinet installation.
  • Select a Fuel Source – Among modern tankless units, you’ll be able to choose between electric, natural gas, and propane fuel sources. To minimize installation and upkeep costs, try to choose an option that is already integrated into your home. The Stiebel Eltron Tempra 24’s electric compatibility is ideal for meeting this goal.
  • Compare Heating Capacity and Flow Rate – Your hot water’s temperature and pressure will be very obvious if they don’t meet your home’s needs, so you should always pick a model that can put out as much warm water as your family uses daily. The Stiebel Eltron Tempra 24 peaks at 5 GPM and can reliably provide output water between 86°F and 140°F.

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

Dimensions & Capacity

Your unit’s physical size has major implications for where you’ll be able to install it, not to mention the ease of maintaining your unit over time. The Stiebel Eltron Tempra 24, for example, only measures in at 4.6 x 16.6 x 14.5 inches, making it ideal for a flexible installation plan. You won’t need to take “capacity” into sizing considerations, though, as tankless units don’t need any capacity for their instantaneous heating functions.

Fuel Type

If you’re shopping among popular brands, you’ll be able to choose between electric, natural gas, and propane powered units. Your chosen fuel type will impact not only the unit’s efficiency, but also its long-term cost to operate (depending on local fuel prices). The Stiebel Eltron Tempra 24 is electric-powered, though, making it an affordable option for most homes.

Flow Rate & Water Pressure

A tankless unit’s flow rate describes how much water can pass through its primary heating system in a minute’s time. This metric can impact not only how efficient a unit is, but also how much water pressure it externally applies to connected outlets. The Stiebel Eltron Tempra 24 is fairly successful on both fronts, with its 5 GPM flow rate providing just enough pressure to prevent any connected outlets from losing efficiency as demand rises.

Heating Capacity

A tankless water heater is made to heat…well, water! So, it’s important to pick out a unit that provides an optimal range of attainable output temperatures. The Stiebel Eltron Tempra 24, for example, provides an 86°F to 140°F temperature range, a prime indicator that it will be able to keep its output temperatures stable even if demand begins to grow exponentially.

Energy Efficiency Ratings & Certifications

While most tankless water heaters are energy efficient in general, only some models carry specialized ratings and certifications to back this notion up. For example, the Stiebel Eltron Tempra 24 advertises that it uses 15-20% less energy compared to a traditional tank heater. Though this model doesn’t carry it, some competing models do include regulatory awards such as an EnergyStar rating.

Price and Warranty

As might be expected, tankless unit prices vary depending on the unit’s size and overall capabilities. The Stiebel Eltron Tempra 24 rarely costs more than $650 if purchased online, a value that includes a 7-year warranty against leaks and a 3-year warranty on all internal parts.

Display Type

Displays make a major impact on the user-friendliness of a given unit. The Stiebel Eltron Tempra 24’s display is among the best in its class, given that its digital screen and differentiated knobs make it easy to manipulate the unit’s operations to meet specified goals. This display setup certainly puts its competitors with analog interfaces to shame.

Different Uses for a Tankless Water Heater

Decentralized In-Home Water Heating

Most homeowners have never considered it, but a decentralized hot water production and delivery system is actually the best method for serving the simultaneous needs of a modern family. By installing several units like the Stiebel Eltron Tempra 24 in heavy use areas of your home (the kitchen and bathrooms, namely), you’ll be able to instantaneously access hot water without ever running the non-existent tank dry.

Cutting Water and Electric Bills

Many homeowners switch to a tankless water heater as a cost-saving measure. That’s because modern models like the Stiebel Eltron Tempra 24 are broadly able to automatically regulate their own water and electricity usage. This model, in particular, is capable in this domain, as evidenced in its use of an advanced flow control system. In all, these types of components decrease utility waste, which in turn drops dollars and cents from your successive utility bills.

Eco-friendliness is all the rage today. This mentality is more than a fad, though, given how the industrialized world’s over-utilization of its natural and manufactured resources is increasingly leading towards near-term shortages. For many, the best place to start an eco-friendlier lifestyle would be on the home front. That’s where a tankless water heater comes into play.

The Stiebel Eltron Tempra 24 may well be the decentralized hot water delivery solution that you’ve been searching for. As such, you should take the time to read this review and gain a fresh appreciation for what this unit and its many purpose-built components are capable of.