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Bosch Whole House & Point-of-Use
Electric Tankless & Mini-Tank Water Heaters
Bosch Tronic 5000, 3000 and 3000T
Models WH27, WH17, US12-US3, ES8, ES4, ES2.5
With compact tankless and mini-tank products from Bosch, there is
no limit to where you can have hot water. These hot water heaters are
an ideal solution for remote locations and when you need hot water at
a dedicated fixture:
u Garage, apartment, pool house, in-law suites
u Supplemental hot water for high-flow fixtures
u Hard to reach locations that need extra hot water
u Smaller properties and second homes
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Bosch Tronic 5000 Series | WH27, WH17
Whole House Electric Tankless Water Heaters
Endless Hot Water for One Major
Application at a Time
The compact and powerful WH27 & WH17 Tronic 5000 Series
electric whole house tankless water heaters can be installed
virtually anywhere inside the home. They are 97% efficient with
minimal stand-by loss and have modulating elements that
ensure a constant output temperature for hot water comfort.
Note: Bosch Tronic 5000 models require hard wiring.
Recommended climate zones for
installation of WH17 and WH27
WA
MT
OR
ID
NV
CA
WH17 or WH27 may be used for whole house
n
WH27 for whole house
n
WH17 for point-of-use only
Model WH17 is not recommended for whole house use in climates where
average ground water temperature is less than 60°F.
UT
AZ
ND
MN
SD
WY
NE
CO
NM
KS
OK
TX
WI
MI
IA
IN
IL
MO
AR
LA
KY
TN
AL
MS
OH
WV
SC
GA
ME
VT
NH
MA
RI
NY
CT
NJ
PA
MD
DE
VA
NC
FL
WATER CONNECTIONS:
¾" inch water connections are
required for the Bosch Tronic
WH27 and WH17. The water
lines both to the inlet & from
the outlet must be copper or
suitably rated stainless steel flex
line for at least 1.5 feet from the
water heater. Plastic or PEX type
plumbing line materials are not
suitable for connecting directly
to the water heater.
Thermal Cutouts
Control PCBs
Polymer Encased
Elements
Flow Transducer
Control PCB
Temperature
Control Knob
20C4 LISTED
Features
u Over 97% thermal efficiency
u Compact and lightweight
u Electronic flow sensor
u Element modulation provides a constant output temperature
u Filter screen on inlet
u Enhanced scale resistance
u Improved temperature stability & control
u 10 year limited warranty
§
Copies of original warranties in their entirety are available at
www.bosch-climate.us
§
Technical Specifications WH27 WH17
Part Numbers
7736500681 7736500682
Electrical Requirements
Volts (VAC)*
Power (kW)
Amps USA /
CANADA**
Minimum USA /
Wire Size CANADA**
Phase
8 GA (6 conductors & ground)
2 GA (2 conductors & ground)
240 / 220 / 208 240 / 220 / 208
26.85 17.25
120 (3 x 40 Amps)†
120 (1 x 120 Amps)
80 (2 x 40 Amps)††
80 (1 x 80 Amps)
8 GA (6 conductors & ground)
4 GA (2 conductors & ground)
Single Single
Maximum flow rates depending on temperature rise
Input (kW)
GPM Output @ Temperature Rise of 75°F
GPM Output @ Temperature Rise of 65°F
GPM Output @ Temperature Rise of 55°F
Example: An inlet water temperature of 55°F and a desired water temperature of 120°F requires a temperature
rise of 65°F.
Note: If operating unit on 208V or 220V instead of 240V, choose the next higher output.
26.9 17.3
2.4 1.6
2.8 1.8
3.3 2.1
ELECTRICAL REQUIREMENTS:
* Specs are based on 240 V. Lesser
voltage (220 V or 208 V) will result
in reduced output. The unit will
not provide an output temperature
above 131˚F. Bosch Tronic 5000
models require hard wiring.
** In Canada unit must be wired to
a single breaker. AE Canada Kit
required.
† The WH27 requires 120 amps
service. This must be supplied
through three 40-amp double-pole
breakers in your breaker box. Your
house MUST have at least 200 amp
service.
†† The WH17 requires 80 amps service.
This must be supplied through two
40-amp double-pole breakers in
your breaker box. Your house MUST
have at least 150 amp service.
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Bosch Tronic 3000 | US12 - US3
Under-Sink Electric Tankless Water Heaters
Endless Hot Water for One Sink at a Time
Compact point-of-use / under-sink tankless water heaters are designed
to provide an endless supply of hot water for kitchen and bathroom
sinks. These units provide 99% efficiency with minimal stand-by loss
and most models are equipped with high/low kW settings.
Note: All Bosch Tronic 3000 models require hard wiring.
Features
u 99% efficient with minimal stand-by loss
u Ultra compact and light weight, saving valuable space
u Copper heat exchanger with copper-sheathed
heating elements
u Units can be mounted horizontally or vertically
(except model US12)
u Model US12 features thermostatic control
u No temperature / pressure relief valve is necessary
(subject to local codes)
u 5 year limited warranty
§
Copies of original warranties in their entirety are available at
www.bosch-climate.us
§
20C4 LISTED
Technical Specifications US12 US9 US7 US6 US3
Part Number
Thermal Efficiency
Thermostatic Control
Activation Flow Rate, GPM
Electrical Requirements
Volts*
Input
(High/Low Setting), kW
Max Amps
Minimum Wire Size
Maximum flow rates depending on temperature rise
GPM Output @ Temperature
Rise of 75°F
GPM Output @ Temperature
Rise of 65°F
GPM Output @ Temperature
Rise of 55°F
Example: An inlet water temperature of 55°F and a desired water temperature of 120°F requires a temperature rise of 65°F.
Note: If operating unit on 208V or 220V instead of 240V, choose the next higher output.
*Specs are based on 240 V. Lesser voltage (220 V or 208 V) will result in reduced output. Values shown are for high / low kW settings.
7736500683 7736500687 7736500684 7736500686 7736500685
99%
3
0.6 0.75 0.75 0.5 0.5
240 / 220 / 208 VAC 240 / 220 / 208 VAC 240 / 220 / 208 VAC 277 VAC 120 VAC
12 9.5 / 4.75 7.2 / 3.60 6.0 / 3.0 3.4
50 40 30 25 30
6 GA 8 GA 10 GA
1.1 0.9 0.7 0.5 0.3
1.3 1.0 0.8 0.6 0.4
1.5 1.2 0.9 0.7 0.4
– – – –
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Bosch Tronic 3000T | ES8, ES4, ES2.5
Point-of-Use Electric Mini-Tank Water Heaters
Hot Water Where You Need It
The Bosch Tronic 3000T point-of-use electric mini-tanks are available in
three sizes which can be wall-hung (bracket included) or floor-mounted.
Easy installation. Simply tap into cold water line, provide electrical
connection and install the water heater directly at the sink. Can be used
alone to provide a small volume of water or installed inline near the point-
of-use with a larger hot water source to eliminate the wait for hot water.
Technical
Specifications
Part Number
Thermal Efficiency
Tank Volume (gal)
Heating Capacity, Watts
Recovery Rate @ 90°F
Rise, GPH
Temperature Range (°F)
Max Operating Pressure (psi)
Weight (lbs)
Dimensions (in)
Water Fittings
Relief Valve
Electrical Requirements
Volts (VAC)
Amps
Wire Type
17½ x 17½ x 14½ 14 x 14 x 12¼ 14 x 14 x 10¼
ES8 ES4 ES2.5
7736500902 7736500901 7736500900
98% 98% 98%
7.1 4 2.7
1440 1440 1440
6.8 6.8 6.8
65 - 145 65 - 145 65 - 145
150 150 150
29.5 17.3 15.5
¾" Male NPT
Included Installed Installed
120 120 120
Hard Wired Plug-In Plug-In
½" Male NPT ½" Male NPT
12 12 12
Features
u Supplies up to 2 sinks at a time (ES8 model)
u Provides hot water quickly at point-of-use
u Compact, lightweight, space saving
u Units can be wall / floor mounted (bracket included) with
u Temperature / pressure relief valve included
u Glass-lined tank for long service life
u Models ES2.5 and ES4 have a simple 120 VAC
u 8 year limited warranty
§
Copies of original warranties in their entirety are available at
No more waiting for hot water. Ideal for stand-alone use or recirculation systems.
Note: Sold in U.S. Only
multi-directional mounting available (ES8 model only)
plug-in connection
§
www.bosch-climate.us
hot cold
Bosch 3000T
Mini-Tank
IMPORTANT
Do not install the unit in an area where leaks will damage the surrounding area. If this is
not possible, a suitable drain pan must be utilized as required by most plumbing codes.
Bosch Thermotechnology Corp.
Londonderry, NH • Ft. Lauderdale, FL
General Inquiries: 1-866-330-2725
Technical Support: 1-866-330-2730
www.bosch-climate.us
Relief valve is required; however it is not
shown in above photo for clarity.
Copyright© 2013 Bosch Thermotechnology Corp. All rights reserved.
73H991001 3/2013
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