Stiebel Eltron Tempra 24 Plus
Indoor | Electric Tankless Water Heater
Summary:
Assumptions ( These are assumptions made by Rinnai for their flow rate chart ):
- Set Temperature – 120 F *
- Shower Heads / Dishwasher / Washing Machine – 2.5 GPM
- Sinks and Faucets – 2 GPM
- Summer Ground Temperature – 70 F *
- Winter Ground Temperature – 50 F *
* We emailed Stiebel and according to Ron,Stiebel does not assume any set temperatures for their flow charts and have said that we will need to calculate the temperature rise to determine the flow rate. We have therefore assumed set and ground temperatures.
According to their flow rate chart (We’re using the chart labeled “Temperature Rise F @240 V versus Flow Rate”),it’s capable of pouring out 2.3 GPM if we assume a Winter Ground Temperature of 50 F and up to 3.25 GPM if assuming a Summer Ground Temperature of 70 F.
Calculations:
120 F (Set Temp) –50 F ( WG Temp) = 70 F (Temp Rise) = 2.3 GPM
120 F (Set Temp) –70 F ( SG Temp) = 50 F (Temp Rise) = 3.25 GPM
So during the winter,you’re looking at being able to use up to 1 shower or possibly 1 appliance . In warm climates,up to 1 shower or 1 appliance and possibly 1 very low flow faucet.
The Stiebel Eltron Tempra 24 represents the first generation and is being discontinued. The second generation models are the Tempra 24B and Tempra 24 Plus. The difference between the 1st generation and 2nd generation models is that the 1st generation only produced up to 125 degrees,whereas the newer models are capable of 140 degrees,allowing for light commercial applications like a restaurant or bar. The Tempra 24B is the basic model. The big difference between the 24B and the 24 PLUS is that the Tempra 24 PLUS has a technology called the Advanced Flow Control which keeps temperatures constant. These are electric tankless water heaters and with electric tankless hot water heaters,there’s no need to worry about purchasing or installing vents.
The Advanced Flow Control is smart enough to know when there’s a change in water usage. Usually if two or more people are in need of water,the Advanced Flow Control mechanism has a microprocessor that senses a change in flow rates,adjusts the flow rate to be slightly slower in order to maintain the constant temperature being used by the two people. The concept is that the faster the water flow,the less time the water has to contact the heating elements,the harder it is to maintain the user’s set temperature for that volume of water,therefore,slowing down the water flow rate allows the unit to keep the temperature at the desired setting. The end user may feel a slight decrease in water pressure,however,the temperature would not fluctuate.
Product Ratings: (To see our impressions of Stiebel’s customer service,go to our tankless water heater brands page)
There seem to be a good portion of very happy customers with the Stiebel. This isn’t to say there were not unhappy customers.
Total Highest Ratings: ( Here we try to give you as many sources for customer reviews as possible. We recommend a minimum of at least a total of 5 highest ratings before you even consider purchasing any unit.)
- Amazon’s highest ratings total (5/5 stars) = 4
- Greenerbuilding.org highest ratings total (4/4 dots)= N/A
- Plumbers Surplus highest ratings total = (5/5 stars) = 1
- Total Highest Ratings = 5
Note: Amazon often lumps all reviews for similar products under one product listing; we only count reviews for this specific model.
A few Stiebel Eltron Tempra 24 Plus review excerpts from customers:
Quick Facts and Features:
- ENERGY STAR® rebate N/A
- Tax Credit 2011 N/A
- Instant water is suitable for up to 2 points of use (up to two people taking a shower at the same time)
- German engineered
- User ability to set temperatures from 86°F –140°F with a dial
- For residential or light commercial
- Up to 4.5 GPM depending on climate.
- Stiebel Eltron Tempra 24 Owner Manual ( This is more of an installation manual )
Dimensions
- Width:16 5/8 inches
- Height:14 1/2 inches
- Depth:4 5/8 inches
Electrical Requirements
- Circuit Breaker Requirement: 2 x 60 amp
- Wire Size: AWG Copper 6
Warranty:
- Heater Exchanger - 3 years (residential) 3 years (commercial)
- Parts –3 years (residential) 3 years (commercial)
- Labor – excluded
- Warranty Info – Official website
Usage Type:
- Indoor
- Residential or Light Commercial
Fuel Type:
- Electric
Venting Required:
- NO
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