Stiebel Eltron 239225 Sizing Guide
Tempra® Trend & Tempra® Plus Whole House Sizing Guide
Tempra® Trend & Tempra® Plus Tankless Electric Water Heater Sizing Guide
1 Use the map to find the approximate ground
water temperature where you live.
2 Check the column on the table with your
ground water temperature to see how many
fixtures can be supplied at the same time with
hot water.
3 Use your actual maximum flow rate to fine-
tune these recommendations. If you know you
have 1.5 GPM low flow showerheads, for
instance, then 3 GPM would supply 2 showers
at the same time, or 1 shower plus 1 sink, etc.
42°F 52°F 62°F 72°F
42°F
52°F
62°F
72°F
®
Tempra
MAX. FLOW RATE FROM UNIT
12
SIMULTANEOUS
FIXTURES
Tempra® 15
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
Tempra® 20
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
Tempra® 24
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
Tempra® 29
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
Tempra® 36
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
Trend & Plus
1.3 GPM 1.6 GPM 1.9 GPM 2.5 GPM
Trend & Plus
1.6
Trend & Plus
2.1
Trend & Plus
2.6 GPM 3.1 GPM 3.8 GPM 5 GPM
Trend & Plus
3.1
Trend & Plus
3.9
DRAWS 50 A - Requires minimum 100 A electric service
Low
Flow
DRAWS 60 A - Requires minimum 100 A electric ser vice
GPM 1.9 GPM 2.4 GPM 3.1 GPM
DRAWS 80 A - Requires minimum 125 A electric service
GPM 2.5 GPM 3.1 GPM 4 GPM
DRAWS 100 A - Requires minimum 150 A electric service
DRAWS 120 A - Requires minimum 200 A electric service
GPM 3.7 GPM 4.6 GPM 6 GPM
DRAWS 150 A - Requires minimum 300 A electric service
GPM 4.6 GPM 5.7 GPM 7.5 GPM
Recommendations are
correct if unit is installed
with 240 V service.
Increase one model size
if unit will be installed
with 208 V service.
Call Stiebel Eltron at
800.582.8423 if you have any
sizing questions, or if you
have high flow showers, or
another out-of-the-ordinary
situation. Stiebel Eltron service representatives can make
recommendations on sizing,
or provide assistance with
our water heaters, to both
homeowners and professional
installers.
MAX. FLOW RATE CALCUL ATED FOR 105°F WATER
FIXTURE FLOW RATES
(AND TYPICAL RANGES)
17 West St., W. Hatfield, MA 01088 | 800.582.8423 | 413.247.3380 | fax 413.247.3369 | info
SHOWER
1.5 GPM
(RANGE 1.5-2.5)
KITCHEN SINK
1.5 GPM
(RANGE 1.0-2.2)
BATHROOM SINK
0.5 GPM
(RANGE 0.5-1.0)
Temp. rise charts on next page.
@
stiebel-eltron-usa.com | www.stiebel-eltron-usa.com
Tempra® Trend & Tempra® Plus Whole House Sizing Guide
Temperature Rise vs. Flow Rate at 240 V
Flow Rate GPM
Temp Rise °F
Tempra® 20
Tempra
®
24
Tempra
®
29
Tempra
®
36
Tempra
®
12
Tempra
®
15
10
20
30
40
50
80
90
70
60
0
1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5
5.0 5.5 6.0 6.5 7.0 7.5 8.0
and 208 V
Temp ra® 20
Temp ra
®
24
Temp ra
®
29
Temp ra
®
36
Temp ra
®
12
Temp ra
®
15
10
20
30
40
50
80
90
70
60
0
1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5
5.0 5.5 6.0 6.5 7.0 7. 5 8.0
Temp Rise °F
Flow Rate GPM
Temperature Rise vs. Flow Rate at 208 V
Temperature Rise vs. Flow Rate at 240 V
90
80
70
60
50
40
Temp Rise °F
30
20
10
0
1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Flow Rate GPM
Temp ra
Temp ra® 12
17 West St., W. Hatfield, MA 01088 | 800.582.8423 | 413.247.3380 | fax 413.247.3369 | info
®
15
5.0 5.5 6.0 6.5 7.0 7. 5 8.0
Temp ra
Temp ra
Temp ra
Temp ra
®
36
®
29
®
24
®
20
@
stiebel-eltron-usa.com | www.stiebel-eltron-usa.com
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