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Installation Manual
Bosch Tronic 6100 C Electric Tankless Water Heaters - BTC 724001301 A (08.2022)
7.2 Plumbing
It is mandatory that all plumbing be done in accordance with federal, local, and
state plumbing codes and practices. Failure to properly install the water heater
WILL VOID the warranty. It is also best practice to use thread tape on all mechanical
plumbing connections.
Do not apply thread tape on the fi rst two threads. Keep clear to
prevent materials entering the water path.
1. Install unions on the hot and cold water connections to easily disconnect the
water heater for servicing. See Figure 10.
Before connecting pipes to the water heater, fl ush the lines to eliminate
all residue and debris from the inlet and outlet lines.
2. Connect the water inlet line to the entry point of the heater (right side inlet),
and connect the outlet line to the water outlet. Use a line that can withstand
a minimum pressure of 150 psi. Using any other type of line will cause
damage. All water pipes within three (3) feet of the unit’s water inlet and
outlet must be rated for high temperature applications of 185°F (85°C)
minimum.
NOTICE: PRODUCT DAMAGE
Do not solder any piping to the unit’s connection points.
If sweat connections are used, sweat tubing to the adapter
before fitting adapter to the water connections on the
heater. Any heat applied to the water heater connections will
permanently damage the water heater. Use two wrenches
when tightening water piping at heater. Use one wrench to
prevent the heater inlet or outlet line from turning. Take care
not to over tighten. Damages due to improper installation
practices ARE NOT covered by warranty.
The maximum operating water pressure of this water heater is 150 psi /
10 bar. Residential plumbing systems with unstable pressure or pressure
above 73 psi require the application of a pressure reducing valve, set to
58 - 73 psi.
NOTICE: PRODUCT DAMAGE
Failure of the water heater due to lime scale build-up on the
heating surface, low pH, or other imbalance IS NOT covered
by the warranty. See Section 3 Water Quality Requirements.
Minimum pipe size should match water heater connection.
The installer is responsible for all equipment and components required by
local codes. In Massachusetts, you must install a vacuum relief valve per
248 CMR. 4.
A temperature and pressure (T&P) relief valve is not required for most
installations, but may be required to meet local, state, or provincial codes.
If codes require a T&P valve, install according to code and manufacturer
instructions.
Mixing valve applications are recommended to help prevent scalding.
It is highly recommended by the manufacturer to install water leak
detection devices and automatic shutoff valves in any water heater
installation where a leakage of water could result in property damages.
7.2.1 Pressure Relief Valve
For protection against excessive pressures in this water heater,a pressure relief
valve (PRV) may be installed. Refer to local codes to see if the installation of a PRV
is required. Install the PRV (with a maximum set pressure of 150 psi) on the hot
outlet line of the water heater, and orient it or provide tubing so that any
discharge from the valve will exit at least 6” above the structural fl oor. The relief line
cannot be in contact with any live electrical parts. The discharge opening must not
be blocked or reduced in size under any circumstances.
Commonwealth of Massachusetts
As a condition of installing this product in the Commonwealth of Massachusetts a
pressure relief valve shall be installed on the hot water side, by a licensed plumber
MGL 142 Section 19. (Approval number: P1-09-25).
DANGER: PERSONAL INJURY, PROPERTY DAMAGE, PRODUCT
DA MAGE
Do not thread a cap or plug into a relief valve or relief valve
line under any circumstances! Explosion and property
damage, serious injury, or death may result.
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