Point of Use Tankless Water Heater Selection Guide

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Regions / Zones - Water Temperatures Map

Regions / Zones - Water Temperatures Map

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

Water Flow Rate
Incoming Water temperature
Activation Flow Rate

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.