Stiebel Eltron Tempra Tankless Water Heater Technical Data


Tempra® Model
  
12
15
20
24
29
36**
Phase
   1 1 1 1 1 1
Voltage
V
 208 240 208 240 208 240 208 240 208 240 208 240
Wattage
kW
 9 12 10.8 14.4 14.4 19.2 18 24 21.6 28.8 27 36
Amperage
A
 44 50 52 60 70 80 88 100 105 120 132 150
Min. required circuit breaker size
A
 60 60 2x40 2x40 2x50 2x50 2x60 2x60 3x50 3x50 3x60 3x60
Recommended wire size
AWG COPPER
6 6 2 x 8 2 x 8 2 x 8 2 x 8 2 x 6 2 x 6 3 x 8 3 x 8 3 x 6 3 x 6
Maximum temp. increase
@1.50 GPM
 41 54 49 65 66 88 82 92 92 92 92 92
above ambient water temp.
@2.25 GPM
27 36 37 43 44 58 54 73 66 87 82 92
 
@3.00 GPM
20 27 25 33 33 44 41 54 49 66 61 82
 
@4.50 GPM
- - - - 22 29 27 37 33 44 41 55
Min. water flow to activate unit
GPM / Lmin
0.29 / 1.1 0.58 / 2.2 0.58 / 2.2 0.58 / 2.2 0.87 / 3.3 0.87 / 3.3
Weight
Lb / Kg
15 / 6.8 18 / 8.1 21 / 9.5 18 / 8.1 24.25 / 11 24.25 / 11
Nominal water volume
Gal / L
0.13 / 0.5 0.26 / 1.0 0.26 / 1.0 0.26 / 1.0 0.39 / 1.5 0.39 / 1.5
Width
inch / cm
14 9/16 / 37 21 3/4 / 55.2 21 3/4 / 55.2
Height
inch / cm
14 1/2 / 36.7
Depth
inch / cm
4 5/8 / 11.6
Working pressure
PSI / BAR
150 / 10
Tested to pressure
PSI / BAR
300 / 20
Water connections
3 / 4" NPT

* Tempra™ 36 requires a 300A minimum electrical service
* Suitable for supply with up to 107° F / 42° C
* Tankless water heaters are considered a non-continuous load
* Conductors should be sized to maintain a voltage drop of less than 3% under load
** Tempra™ 36 requires a 300A minimum electrical service

Water Heater Temp Graph