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Technical Specifi cations continued
Model
Gas input
(BTU/hr)
Minimum fl ow to activate (GPM)
Maximum fl ow rate at 35° rise (GPM)
Maximum fl ow rate at 90° rise (GPM)
Thermal Effi ciency
Dimensions
(inches)
Weight (lbs.)
Modulating gas valve
Ignition
Gas connection
Water connections
NG gas pressure
(inches of W.C.)
LP gas pressure
(inches of W.C.)
Water pressure
Static - (PSI)
Electrical supply
Venting options
Venting diameter
(inches)
Vent material
Data subject to change without notice | 01.2011
660 EF
660 EFO
Min: 20,000
Min: 20,000
Max: 140,000
Max: 140,000
0.5
0.5
6.6
6.6
2.6
2.6
NG: 82%
NG: 82%
LP: 82%
LP: 82%
H: 20.5
H: 20.5
W: 13.8
W: 13.8
D: 6.7
D: 6.7
36
36
yes
yes
Electronic
Electronic
¾" Male NPT
¾" Male NPT
¾" Male NPT
¾" Male NPT
Min: 4
Min: 4
Max: 10.5
Max: 10.5
Min: 8
Min: 8
Max: 14
Max: 14
Min: 30
Min: 30
Min (well): 40
Min (well): 40
Max: 150
Max: 150
120VAC
120VAC
Fan assisted
Outdoor
installation
Vertical and
horizontal
termination
3
N/A
Stainless steel
N/A
(AL29-4C)
THERM Tankless Water Heater Applications Manual
520 HN
520 PN
Min: 30,735
Min: 31,000
Max: 117,000
Max: 117,000
0.5
0.5
5.2
5.2
2.0
2.0
NG: 80%
NG: 78%
LP: 80%
LP: 78%
H: 36.75
H: 25.79
W: 18.25
W: 18.11
D: 10.5
D: 8.66
35
35
no
no
Hydro-
Standing
generated
pilot
¾" Male NPT
¾" Male NPT
½" Male NPT
½" Male NPT
Min: 5.7
Min: 5.7
Max: 14
Max: 14
Min: 10.5
Min: 10.5
Max: 14
Max: 14
Min: 30
Min: 30
Min (well): 40
Min (well): 40
Max: 150
Max: 150
N/A
N/A
Vertical
Vertical
natural draft
natural draft
* horizontal
* horizontal
termination
termination
only with AQ4
only with AQ4
vent kit
vent kit
5
5
Type B-vent
Type B-vent
recommended
recommended
BOSCH THERMOTECHNOLOGY CORPORATION
330 PN
Min:
Max: 74,900
0.5
3.3
1.3
NG: 78%
LP: 78%
H: 22.83
W: 12.20
D: 8.66
26
no
Standing
pilot
½" Male NPT
½" Male NPT
Min: 5.7
Max: 14
Min: 10.5
Max: 14
Min: 30
Min (well): 40
Max: 150
N/A
Vertical
natural draft
* horizontal
termination
not allowed
4
Type B-vent
recommended
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