Bosch Therm C 1210 ES Installation And Operating Instructions Manual page 25

Indoor residential and commercial models

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Table of Contents

Fig. 13

Horizontal venting system (concentric vent)

[1] Exhaust

[2] Combustion air

[3] Exhaust pipe

[4] Drain tee

[5] Intake pipe

[LA] Minimum 1"

Fig. 14

Horizontal parallel venting system (twin pipe direct

vent)

[A] 3 ft minimum

C 1210ES/ESC – 6 720 644 887 (2022/04)

Fig. 15

Horizontal venting system (single pipe penetration)

[1] Exhaust pipe

[2] Drain tee

[3] Intake pipe

[LA] Minimum 4"

WARNING:

▶ Single pipe penetration should be used in non-freezing

climates only and steps must be taken to ensure that

adequate combustion air is available to the water heater at

all times!

4.3.4 Vent connections

Attaching the exhaust and air inlet connection adaptors to

the top of the heater

NOTE: Vent pipe must be completely vertical when inserting or

blue gasket inside exhaust accessory can become displaced.

Exhaust accessory can be removed with vent pipe attached to

check gasket position.

Installation instructions