Bosch C1210ESC - Page 15

Applications Manual THERM/GREENTHERM Tankless Water Heaters | 13
Bosch Thermotechnology Corp.
Data subject to change
- C 1210 ES (residential model) has a maximum
set-point temperature of 140°F.
- C 1210 ESC (commercial model) has a maximum
set-point temperature of 180°F.
- To achieve temperatures up to 184°F with C
1050 ES, C950 ES, 940 ES, 940 ESO, and 830 ES,
the optional High Temperature kit #7736500074
is required.
Technical speci cations
Unit
520 HN 520 PN 330 PN
Gas input BTU/hr
Max: 117,000
Min: 30,735
Max: 117,000
Min: 30,735
Max: 74,900
Min: 30,735
Minimum  ow to activate GPM 0.5 0.5 0.5
Maximum  ow rate at 35° rise GPM 5.2 5.2 3.3
Maximum  ow rate at 90° rise GPM 2.0 2.0 1.3
Thermal ef ciency %
NG: 80
LP: 80
NG: 78
LP: 78
NG: 78
LP: 78
Energy factor  N/A N/A N/A
Dimensions Inches
H: 25.79
W: 17.11
D: 8.66
H: 25.79
W: 18.11
D: 8.66
H: 22.83
W: 12.20
D: 8.66
Weight LBS 35 35 36
Modulating gas valve  Mechanical Mechanical Mechanical
Ignition 
Hydro-
generated
Standing
pilot
Standing
pilot
Gas connection Inches
¾ Male NPT ¾ Male NPT ½ Male NPT
Water connections Inches
½ Male NPT ½ Male NPT ½ Male NPT
NG gas pressure Inches of W.C.
Min: 5.7
Max: 14.0
Min: 5.7
Max: 14.0
Min: 5.7
Max: 14.0
LP gas pressure Inches of W.C.
Min: 10.5
Max: 14.0
Min: 10.5
Max: 14.0
Min: 10.5
Max: 14.0
Water pressure- static PSI
Min: 30
Min (well): 40
Max: 150
Min: 30
Min (well): 40
Max: 150
Min: 30
Min (well): 40
Max: 150
Electrical supply VAC N/A N/A N/A
Venting options 
Vertical
natural draft,
Horizontal
termination
only with AQ4
vent kit
Vertical
natural draft,
Horizontal
termination
only with AQ4
vent kit
Vertical
natural draft,
Horizontal
termination
not allowed
Venting diameter Inches 5 5 4
Vent material 
Type B-vent
recommended
Type B-vent
recommended
Type B-vent
recommended
Temperature range °F High to low High to low High to low
The following models are designed to be installed
indoors but may be installed outdoors with the
Outdoor Kit: 830 ES, 940 ES, C 950 ES, C 1050 ES,
C 1210 ES / ESC. Please refer to the installation
manuals for details.