Point of Use Tankless Water Heater Selection Guide

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Regions / Zones - Water Temperatures Map

The three most important important considerations when choosing a point-of-use tankless water heater are:

The following chart will provide you with some guidelines as to the flow rates of common water applications. It is important to note that these flow rates are only estimates and can vary based on water pressure, the faucet installed, and a variety of other factors. Accordingly, you are encouraged to test the actual flow rate of your application for a more precise model determination.

Application Typical Flow Rate in
GPM at 60 PSI
Bathroom Sink Faucet 0.5 to 1.5 GPM
Average Kitchen Faucet 1.0 to 2.2 GPM
Average Shower 1.5 to 2.0 GPM (Max. 2.5 GPM)
Average Bath Tub 2.0 to 3.0 GPM
Washing Machine 1.5 to 3.0 GPM


Once you have determined the flow rate your require, use the map and chart below to determine which models are able to meet your flow rate needs based on your incoming water temperature. It is important to verify that the activation flow rate for the model selected is less than the flow rate of your application or the heater will not activate.

Maximum Flow Rate for Given Incoming Water Temperature (based on 105F output temperature)
Model KW* Voltage Activation
Flow Rate
Flow
Comp.
40F 45F 50F 55F 60F 65F 70F 75F 80F
Stiebel Eltron Mini Series
Stiebel Eltron
Mini 2-1
1.8 110-120 0.21 GPM No - - - - - 0.32 GPM 0.32 GPM 0.32 GPM 0.32 GPM
Stiebel Eltron
Mini 2.5-1
2.4 110-120 0.40 GPM No - - - - - - 0.48 GPM 0.50 GPM 0.50 GPM
Stiebel Eltron
Mini 3-1
3.0 110-120 0.40 GPM No - - - - - - 0.58 GPM 0.68 GPM 0.82 GPM
Stiebel Eltron
Mini 3.5-1
3.5 110-120 0.40 GPM No - - - - - - 0.60 GPM 0.70 GPM 0.84 GPM
Stiebel Eltron
Mini 4-2
3.5 208-240 0.40 GPM No - - - - - 0.60 GPM 0.68 GPM 0.79 GPM 0.95 GPM
Stiebel Eltron
Mini 6-2
5.7 208-240 0.77 GPM No - - - - - 0.97 GPM 1.11 GPM 1.29 GPM 1.55 GPM
Model KW* Voltage Activation
Flow Rate
Flow
Comp.
40F 45F 50F 55F 60F 65F 70F 75F 80F
Stiebel Eltron DHC Series
Stiebel Eltron
DHC 3-1
3.0 110-120 0.32 GPM No - - - - - 0.5 GPM 0.6 GPM 0.7 GPM 0.8 GPM
Stiebel Eltron
DHC 3-2
3.3 208-240 0.32 GPM No - - - - 0.5 GPM 0.6 GPM 0.6 GPM 0.7 GPM 0.9 GPM
Stiebel Eltron
DHC 4-2
3.8 208-240 0.42 GPM No - - - 0.5 GPM 0.6 GPM 0.6 GPM 0.7 GPM 0.8 GPM 1.0 GPM
Stiebel Eltron
DHC 4-3
4.5 277 0.42 GPM No - 0.5 GPM 0.6 GPM 0.6 GPM 0.7 GPM 0.8 GPM 0.9 GPM 1.0 GPM 1.3 GPM
Stiebel Eltron
DHC 5-2
4.8 208-240 0.42 GPM No 0.5 GPM 0.6 GPM 0.6 GPM 0.7 GPM 0.7 GPM 0.8 GPM 0.9 GPM 1.0 GPM 1.3 GPM
Stiebel Eltron
DHC 6-2
6.0 208-240 0.47 GPM No 0.7 GPM 0.7 GPM 0.7 GPM 0.8 GPM 0.9 GPM 1.0 GPM 1.1 GPM 1.3 GPM 1.6 GPM
Stiebel Eltron
DHC 8-2
7.2 208-240 0.69 GPM No 0.75 GPM 0.82 GPM 0.89 GPM 0.98 GPM 1.09 GPM 1.22 GPM 1.40 GPM 1.63 GPM 2.00 GPM
Stiebel Eltron
DHC 10-2
9.6 208-240 0.79 GPM No 1.00 GPM 1.09 GPM 1.19 GPM 1.31 GPM 1.45 GPM 1.63 GPM 1.87 GPM 2.18 GPM 2.60 GPM
Model KW* Voltage Activation
Flow Rate
Flow
Comp.
40F 45F 50F 55F 60F 65F 70F 75F 80F
Stiebel Eltron DHC-E Series
Stiebel Eltron
DHC-E 8/10
@ 8 KW
7.2 208-240 0.26 GPM Yes 0.75 GPM 0.82 GPM 0.89 GPM 0.98 GPM 1.09 GPM 1.22 GPM 1.40 GPM 1.63 GPM 2.00 GPM
Stiebel Eltron
DHC-E 8/10
@ 10 KW
9.6 208-240 0.26 GPM Yes 1.00 GPM 1.09 GPM 1.19 GPM 1.31 GPM 1.45 GPM 1.63 GPM 1.87 GPM 2.18 GPM 2.60 GPM
Stiebel Eltron
DHC-E 12
12 208-240 0.26 GPM Yes 1.3 GPM 1.4 GPM 1.5 GPM 1.6 GPM 1.8 GPM 2.0 GPM 2.3 GPM 2.7 GPM 3.3 GPM
Model KW* Voltage Activation
Flow Rate
Flow
Comp.
40F 45F 50F 55F 60F 65F 70F 75F 80F
Stiebel Eltron Tempra / Tempra Plus Series
Tempra 12
Tempra 12 Plus
12.0 208-240 0.37 GPM Yes 1.3 GPM 1.4 GPM 1.5 GPM 1.6 GPM 1.8 GPM 2.0 GPM 2.3 GPM 2.7 GPM 3.3 GPM
Tempra 15
Tempra 15 Plus
14.4 208-240 0.50 GPM Yes 1.5 GPM 1.6 GPM 1.8 GPM 2.0 GPM 2.2 GPM 2.4 GPM 2.8 GPM 3.3 GPM 3.9 GPM
Tempra 20
Tempra 20 Plus
19.2 208-240 0.50 GPM Yes 2.0 GPM 2.2 GPM 2.4 GPM 2.6 GPM 2.9 GPM 3.3 GPM 3.7 GPM 4.4 GPM 5.2 GPM
Tempra 24
Tempra 24 Plus
24.0 208-240 0.50 GPM Yes 2.5 GPM 2.7 GPM 3.0 GPM 3.3 GPM 3.6 GPM 4.1 GPM 4.7 GPM 5.4 GPM 6.5 GPM
Tempra 29
Tempra 29 Plus
28.8 208-240 0.77 GPM Yes 3.0 GPM 3.3 GPM 3.6 GPM 3.9 GPM 4.4 GPM 4.9 GPM 5.6 GPM 6.5 GPM 7.8 GPM
Tempra 36
Tempra 36 Plus
36.0 208-240 0.77 GPM Yes 3.8 GPM 4.1 GPM 4.5 GPM 4.9 GPM 5.4 GPM 6.1 GPM 7.0 GPM 8.2 GPM 9.8 GPM

* all KW ratings based on 240 volt except for Mini 2-1, 2.5-1, 3-1, 3.5-1 and DHC 3-1 which are based on 120 volts, and except DHC 4-3 which is based on 277 volts.