Bosch C1210ES Specifications download pdf (Page 13)

Installation instructions | 13

6 720 644 887 (2014/11)C 1210 ES/ESC

4.3.2 Vent specifications

Establish vent clearances that comply with the vent manufacturer's

specifications and all applicable national/local codes.

Venting specifications

[*] ULC S636-95, UL1738 certified

Condensate drain requirements

When the Water Heater is installed in a residential single family dwelling

without direct recirculation an external condensate drain is not required.

If the Water Heater is installed in an application other than a residential

single family dwelling an external condensate drain (not supplied with

the Water Heater) is required in the following circumstances:

• Vertical terminating exhaust vent installations.

• Horizontal terminating exhaust vent installations greater than 6 feet

(1.8 m) linear measurement, (NOT total equivalent length).

• Vent installations where any section of the exhaust vent pipe passes

through an unconditioned space.

Note: An external condensate drain is recommended in all installations

as best practice in order to maximize the longevity of the Water Heater.

Minimum combustion air and exhaust pipe length

The minimum exhaust pipe length is 1 foot (0.3m) of straight vent pipe.

The minimum combustion air pipe length is one 90° elbow.

Maximum combustion air and exhaust pipe length

The following tables display the maximum allowable straight pipe

lengths for combustion air and exhaust piping with consideration to the

number of elbows used. Reduce the equivalent length for each elbow

used from the maximum allowable length depending on the system

used. Refer to table 8 if using 3" diameter venting. Refer to table 9 if

using 4" diameter venting.

Use of elbows

It is recommended to limit the amount of elbows used in the exhaust and

combustion air piping to reduce friction in the air flow. The following lists

the maximum amount of 90° elbows allowed in either the exhaust or

combustion air piping:

Calculation example for 3" venting:

Exhaust

Combustion air

Diam. Approved terminals

3 or 4 inches

“T” terminal

90° elbow

PVC Flue Cap*(ECAP321)Vertical terminations

only 3" diameter only

Concentric (196016)

3 or 4 inches

“T” terminal

90° elbow

PVC Flue Cap*(ECAP321)Vertical & horizontal

terminations approved 3" diameter only

Concentric (196016)

Table 7 Venting specifications for intake and exhaust

3" Venting

Maximum

allowable

Exhaust pipe

length

Combustion air

pipe length

Elbow

Equivalency

90° 45°

Twin pipe

system

31ft 31ft 5 ft 3 ft

Concentric

system

23ft 23ft 5 ft 3 ft

Table 8 Maximum Allowable Exhaust and Combustion Air Lengths for 3"

venting

4" Venting

Maximum

allowable

Exhaust pipe

length

Combustion air

pipe length

Elbow

Equivalency

90° 45°

Twin pipe

system

63ft 63ft 2.5ft 1.5ft

Concentric

system

43ft 43ft 2.5ft 1.5ft

Table 9 Maximum Allowable Exhaust and Combustion Air Lengths for 4"

venting

Max. number of 90° elbows 3" venting 4" venting

Twin pipe system 5 7

Concentric system 4 7

Table 10

Two 45° elbows are equal to one 90° elbow. Any

combination of 45° and 90° elbows may be used in

the vent system as long as the combination does not

exceed the maximum listed in table 10 above.

System used Concentric

Number of 90° elbows needed: 1

Number of 45° elbows needed: 2

Table 11

Calculation of example

Max. length 23’

90° elbow reduction - 5’

sub-total = 18’

45° elbow reduction - 6’

Total = 12’

Table 12

For this example, the maximum allowable exhaust pipe

length is 12 feet.

System used Concentric

Number of 90° elbows needed: 2

Number of 45° elbows needed: 1

Table 13

Calculation of example

Max. length 23’

90° elbow reduction - 10’

sub-total = 13’

45° elbow reduction - 3’

Total = 10’

Table 14

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 63 64

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Bosch C1210ES Specifications Page 13

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