Bosch WH27 Specifications

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

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

WH17 or WH27 may be used for whole house

WH27 for whole house

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.

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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