How to Guide

Tempra
®
Trend & Tempra
®
Plus Whole House Sizing Guide
17 West St., W. Hatfield, MA 01088 | 800.582.8423 | 413.247.3380 | fax [phone] | info
@
stiebel-eltron-usa.com | www.stiebel-eltron-usa.com
SIMULTANEOUS
FIXTURES
42°F 52°F 62°F 72°F
Tempra
®
12
Trend & Plus
DRAWS 50 A - Requires minimum 100 A electric service
Tempra
®
Trend
&
Tempra
®
Plus Tankless Electric Water Heater Sizing Guide
MAX. FLOW RATE FROM UNIT
1.3 GPM 1.6 GPM 1.9 GPM 2.5 GPM
Tempra
®
24
Trend & Plus
DRAWS 100 A - Requires minimum 150 A electric service
Tempra
®
15
Trend & Plus
DRAWS 60 A - Requires minimum 100 A electric service
1.6
GPM 1.9 GPM 2.4 GPM 3.1 GPM
Tempra
®
20
Trend & Plus
DRAWS 80 A - Requires minimum 125 A electric service
2.1
GPM 2.5 GPM 3.1 GPM 4 GPM
Tempra
®
29
Trend & Plus
DRAWS 120 A - Requires minimum 200 A electric service
3.1
GPM 3.7 GPM 4.6 GPM 6 GPM
Tempra
®
36
Trend & Plus
DRAWS 150 A - Requires minimum 300 A electric service
3.9
GPM 4.6 GPM 5.7 GPM 7.5 GPM
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.
MAX. FLOW RATE CALCULATED FOR 105°F WATER
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)
FIXTURE FLOW RATES
(AND TYPICAL RANGES)
SIMULTANEOUS
FIXTURES
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
MAX. FLOW RATE FROM UNIT
SIMULTANEOUS
FIXTURES
MAX. FLOW RATE FROM UNIT
42°F
52°F
72°F
62°F
2.6 GPM 3.1 GPM 3.8 GPM 5 GPM
Low
Flow
Temp. rise charts on next page.

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 ser-
vice representatives can make
recommendations on sizing,
or provide assistance with
our water heaters, to both
homeowners and professional
installers.