Bosch US7, US9 User Manual
TRONIC
US3 / US6 / US7 / US9
Electric Tankless Water Heaters
Dimensions
6½"
Engineering
Submittal
Sheet
½"
4"
3"
Engineering Specifi cations
Water heater shall be a Model TRONIC US3, US6, US7, or US9.
Installation shall consist of ___Model TRONIC US9
electric tankless water heaters as distributed by Bosch
Thermotechnology Corp. with a thermal effi ciency of 99%.
Supply voltage shall be 240VAC (208VAC) with a maximum
output of 9.5kW in high stage and 4.75kW in low stage.
Minimum fl ow rate shall be 0.75gpm
Installation shall consist of ___Model TRONIC US6
electric tankless water heaters as distributed by Bosch
Thermotechnology Corp. with a thermal effi ciency of 99%.
Supply voltage shall be 277VAC with a maximum output of
6.0kW. Minimum fl ow rate shall be 0.5gpm
Installation shall consist of ___Model TRONIC US3
electric tankless water heaters as distributed by Bosch
Thermotechnology Corp. with a thermal effi ciency of 99%.
Supply voltage shall be 110-120VAC with a maximum output of
3.4kW in high stage and 3.0kW in low stage. Minimum fl ow rate
shall be 0.5gpm
4¼"
12¾"
Installation shall consist of ___Model TRONIC US7
electric tankless water heaters as distributed by Bosch
Thermotechnology Corp. with a thermal effi ciency of 99%.
Supply voltage shall be 240VAC (208VAC) with a maximum
output of 7.2kW in high stage and 5.4kW in low stage.
Minimum fl ow rate shall be 0.75gpm
The tankless water heaters shall be UL listed for the US and
Canada and UPC certifi ed.
CONSTRUCTION
Water heater shall be electricity powered with compact
tankless design. Primary heat exchanger shall be made from
solid copper tubing, elements shall be copper-sheathed
and unit shall be protected by a tough plastic housing. Heat
exchanger shall be rated for maximum working pressure not
less than 150 psig. Water heater shall be equipped with a fl ow
switch. Water connections for inlet and outlet shall be ½” NPT
male.
The internal controls shall contain a power selector and a high
temperature safety cut-out with manual reset.
1 of 4
Bosch Thermotechnology Corp. reserves the right to make changes without notice due
to continuing engineering and technological advances | BTC 721008304 A | 12.2011
Bosch Thermotechnology Corporation
Londonderry, NH • Ft. Lauderdale, FL • Irvine, CA
Tel: 1-800-798-8161 Fax: 1-603-965-7581 www.bosch-climate.us
TRONIC US3 / US6 / US7 / US9
Electric Tankless Water Heaters
Engineering Specifi cations
Engineering Submittal Sheet
INSTALLATION
All aspects of installation of Water Heater Plant shall be in
strict accordance with manufacturer’s instructions. Materials
shall conform to all manufacturer’s recommendations including
OPERATION
The appliance shall have a high setting with two elements
energized and an output and a low setting with one element
energized.
electrical connections and wiring.
WARRANTY
Water heater piping shall be fi eld constructed of materials
as specifi ed. Water heater shall be installed with individually
isolating shutoff valves for service and maintenance.
Unit shall be installed in close vicinity of point of use.
Technical data
Description Unit US3 US6 US7 US9
Part number
Voltage supply V AC 110-120 277 240 (208) 240 (208)
Minimum circuit breaker size A 30 25 30 40
Maximum output kW 3.4 -3.0 6.0 7.2 (5.4) 9.5 (7.1)
Maximum output on low kW setting ²
Minimum recommended wire size AWG 10 10 10 8
Thermal effi ciency % 99 99 99 99
Water pressure range psi 10 - 150 10 - 150 10 - 150 10 - 150
Activation fl ow rate GPM 0.5 0.5 0.75 0.75
Maximum inlet water temperature ¹
Inlet / Outlet connections Inch
Weight (without water) lbs 5 5 5 5
Certifi cations
)
Do not use heater for water temperature boosting applications
¹
²) High/Low kw settings possible within some models
)
)
− 7-736-500-685 7-736-500-686 7-736-500-684 7-736-500-687
kW − 3.0 3.6 (2.7) 4.8 (3.6)
° F ≤ 86 ≤ 86 ≤ 86 ≤ 86
½” NPT ½” NPT ½” NPT ½” NPT
−
The heating element shall carry a 5-year warranty against
leakage. All other parts and components shall carry a 1 year
warranty against defects in materials or workmanship.
NSF/ANSI 61
U
P
C
®
2 of 4
Bosch Thermotechnology Corp. reserves the right to make changes without notice due
to continuing engineering and technological advances | BTC 721008304 A | 12.2011
Bosch Thermotechnology Corporation
Londonderry, NH • Ft. Lauderdale, FL • Irvine, CA
Tel: 1-800-798-8161 Fax: 1-603-965-7581 www.bosch-climate.us
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