Bosch WH27 User Manual
TRONIC WH17 & WH27
Electric Tankless Water Heaters
Dimensions
Engineering
Submittal
Sheet
2½"
3½"
15¼"
12⅝"
12⅝"
6⅛"
4½"
12½"
InletOutlet
1¾"
5¾"
Engineering Specifi cations
Water heater shall be a Model TRONIC WH17 or, WH27.
Installation shall consist of ___Model TRONIC WH17 electric
tankless water heaters as distributed by Bosch Thermotechnology
Corp. and 99% thermal effi ciency. Supply voltage shall be
240VAC (208VAC, 220VAC) with a maximum output of 17.25kW.
Installation shall consist of ___Model TRONIC WH27 electric
tankless water heaters as distributed by Bosch Thermotechnology
Corp. with a thermal effi ciency of 99%. Supply voltage shall be
240VAC (208VAC, 220VAC) with a maximum output of 26.85kW.
The tankless water heaters shall be UL listed for the US and
Canada and UPC certifi ed.
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Bosch Thermotechnology Corp. reserves the right to make changes without notice due
to continuing engineering and technological advances | BTC 722008302 A | 12.2011
CONSTRUCTION
Water heater shall be electricity powered with compact
tankless design for whole house operation and an effi ciency
rating of 97%. Primary heat exchanger shall be made from
composite material and the elements shall be made from
-sheathed copper. Unit shall be protected by a tough sheet
metal housing. Heat exchanger shall be rated for maximum
working pressure not less than 150 psig. Water heater shall be
equipped with a fl ow turbine. Water connections for inlet and
outlet shall be ¾” NPT male.
The controls shall contain an external output temperature
selector and a high temperature safety cut-out. Unit shall be
equipped with a fl ow turbine and a temperature sensor for
constant output temperature. A red light shall indicate when
the unit is powering one or more elements.
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 WH17 & WH27
Electric Tankless Water Heaters
Engineering Specifi cations
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
electrical connections and wiring.
discharge water temperature shall be set through an internal
set point with a fi eld adjustment of 95 to 131 degrees F. Heater
shall be capable of maintaining the temperature set point +/- 3
degrees F. This shall be accomplished by switching or pulsing
the power to the electrical elements.
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.
WARRANTY
The heating modules shall carry a 10-year warranty. All other
parts and components shall carry a 1 year warranty against
MODE OF OPERATION
defects in materials or workmanship.
The heater shall include integral factory wired operating
controls to control all operation and energy input. Control of
Technical Data
Description Unit WH17 WH27
Part number − 7-736-500-682
Voltage supply VAC 240 240
Amperage A 2 x 40 (Canada 80) 3 x 40 (Canada 120)
Maximum output kW 17.25 26.85
Maximum output at 220V kW 15.00 kW 22.50
Maximum output at 208V kW 13.00 20.00
Minimum recommended wire size AWG 8 8
Thermal effi ciency % 97 97
Temperature control range ° F 95 - 131 95 - 131
Maximum inlet water temperature* ° F ≤ 86 ≤ 86
Water pressure range psi 15 - 150 15 - 150
Minimum fl ow rate GPM 0.6 0.8
Inlet / Outlet connections Inch
Weight (without water) lbs 20 22
Certifi cations
* Do not use heater for water temperature boosting applications
−
¾ NPT ¾ NPT
7-736-500-681
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 722008302 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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