Stiebel Eltron Electric Tankless Water Heater Techs and Specs
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Flow Rates
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Model
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40F° Rise
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55F° Rise
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60F° Rise
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70F° Rise
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80F° Rise
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Tempra 12 - 240v
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2.00 gpm
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1.50 gpm
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1.35 gpm
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1.20 gpm
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1.00 gpm
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Tempra 15 - 240v
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2.50 gpm
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1.77 gpm
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1.62 gpm
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1.40 gpm
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1.25 gpm
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Tempra 20 - 240v
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3.25 gpm
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2.37 gpm
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2.20 gpm
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1.85 gpm
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1.65 gpm
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Tempra 24 - 240v
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4.10 gpm
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2.95 gpm
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2.75 gpm
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2.35 gpm
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2.10 gpm
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Tempra 29 - 240v
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4.75 gpm
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3.60 gpm
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3.25 gpm
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2.65 gpm
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2.40 gpm
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Tempra 36 - 240v
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6.10 gpm
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4.50 gpm
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4.20 gpm
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3.50 gpm
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3.25 gpm
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Average Input Water Temperature in the USA is 50-degrees during the winter
and 55-degrees during the summer. This will vary from place to place - so
make sure you check your input water Temperature.
Use the chart above to calculate how much hot water you will get.
See the install manual for more info.
Also, for lower voltage -
de-rate as needed.
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Stiebel-Eltron Sizing Chart
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Model
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Capacity
Assumes a 50-degree Input Water Temperature
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Tempra 12
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Provides 1.20 gallons per minute for water usage at 120°f: sink, dishwasher (not simultaneously)
Provides 1.507 gallons per minute for water usage at 105°f: (Not recommended for showers in
cold climates)
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Tempra 15
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Provides 1.40 gallons per minute for water usage at 120°f: sink, dishwasher (not simultaneously)
Provides 1.77 gallons per minute for water usage at 105°f: (Not recommended for showers in
cold climates)
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Tempra 20
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Provides 1.85 gallons per minute for water usage at 120°f: sink, dishwasher (not simultaneously)
Provides 2.37 gallons per minute for water usage at 105°f: shower, laundry, bathtub (fills in
approx. 10 minutes)
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Tempra 24
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Provides 2.35 gallons per minute for water usage at 120°f: sink, dishwasher (not simultaneously)
Provides 2.95 gallons per minute for water usage at 105°f: shower, laundry, bathtub (fills in
approx. 10 minutes)
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Tempra 29
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Provides 2.65 gallons per minute for water usage at 120°f: 2 sinks at once, dishwasher
Provides 3.60 gallons per minute for water usage at 105°f: 2 sinks at once or 1 shower, bathtub fills in
about 7 minutes
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Tempra 36
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Provides 3.50 gallons per minute for water usage at 120°f: 2 sinks at once, dishwasher
Provides 4.50 gallons per minute for water usage at 105°f: 2 sinks at once or 1 shower, bathtub fills in
about 7 minutes
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Specifications
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Model
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Volts
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Kilowatts
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Wire Size
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Weight
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Dimensions
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Tempra 12
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240v
208v
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12.0 kw
9.0kw
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Min 6 gauge
Min 120 Amp Service *
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15 lbs
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14 1/2" x 14 1/2" x 4 5/8"
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Tempra 15
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240v
208v
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14.4 kw
10.8 kw
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Min 8 gauge
Min 120 Amp Service *
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18 lbs
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14 1/2" x 14 1/2" x 4 5/8"
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Tempra 20
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240v
208v
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19.2 kw
14.40kw
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Min 8 gauge
Min 150 Amp Service *
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21 lbs
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14 1/2" x 14 1/2" x 4 5/8"
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Tempra 24
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240v
208v
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24 kw
18 kw
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Min 6 gauge
Min 180 Amp Service *
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21 lbs
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14 1/2" x 14 1/2" x 4 5/8"
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Tempra 29
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240v
208v
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28.8 kw
21.6 kw
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Min 8 gauge
Min 200 Amp Service *
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24.25 lbs
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21 3/4" x 14 1/2" x 4 5/8"
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Tempra 36
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240v
208v
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36.0 kw
27.0 kw
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Min 6 gauge
Min 300 Amp Service *
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24.25 lbs
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21 3/4" x 14 1/2" x 4 5/8"
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* This reflects minimum Amperage service and wire size. But, only your
electrician can determine actual
minimum sizes required. Make sure
you contact an electrician before you buy any electric tankless
water heater.
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Technical Information
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Model
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Tempra 12
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Tempra 15
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Tempra 20
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Tempra 24
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Tempra 29
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Tempra 36
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Phase
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1
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1
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1
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1
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1
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1
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Max. Amp Load
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50 amps
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44 amps
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60 amps
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52 amps
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80 amps
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70 amps
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100 amps
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88 amps
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120 amps
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105 amps
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150 amps
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132 amps
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Min. Circuit Breaker size
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1 x 60 amps
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1 x 60 amps
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2 x 40 amps
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2 x 40 amps
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2 x 50 amps
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2 x 50 amps
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2 x 60 amps
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2 x 60 amps
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3 x 50 amps
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3 x 50 amps
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3 x 60 amps
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3 x 60 amps
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Min Required Wire Size AWG Copper
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1 x 6
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1 x 6
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2 x 8
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2 x 8
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2 x 8
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2 x 8
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2 x 6
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2 x 6
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3 x 8
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3 x 8
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3 x 6
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3 x 6
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Min Water Flow to activate unit
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.29 gpm
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.58 gpm
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.58 gpm
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.58 gpm
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.87 gpm
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.87 gpm
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Pressure Lost in Unit
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1.45 psi
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1.45 psi
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1.45 psi
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1.45 psi
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1.45 psi
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1.45 psi
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Nominal Water Volume
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.13 gallons
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.26 gallons
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.26 gallons
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.26 gallons
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.39 gallons
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.39 gallons
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Working Pressure (MAX)
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150 PSI
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150 PSI
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150 PSI
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150 PSI
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150 PSI
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150 PSI
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Water Connections
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3/4-inch NPT
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3/4-inch NPT
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3/4-inch NPT
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3/4-inch NPT
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3/4-inch NPT
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3/4-inch NPT
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3 Year Warranty
Stiebel-Eltron has the best warranty in the industry.
See Warranty Page
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Stiebel Eltron Electric Tankless Water Heater PDF Manuals and Brochures - Click Here
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