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Type NWHO-45, 72, 108 Circulation Heaters
for Regular and Fuel Oil Heating
2 x 3/4"
Slot
B
D
A
6" Outlet
Temperature
Control
6" Inlet
General
The high capacity NWHO-45, 72 or 108 series are in-
tended for indoor use and are used primarily for oil
heating.
The 45, 72 or 108 steel sheathed tubular elements are
centered in a 14", 16" or 18" diameter steel heating
chamber, respectively, and welded to a removable steel
flange. The assembly is surrounded by 2" of insulation
and a sheet metal jacket.
Depending upon the order specifications, the NWHO-
45, 72 or 108 may or may not be factory equipped with
an MF2 or other Chromalox thermostat. Such thermo-
stats function to control outlet temperatures and to
limit internal temperatures under abnormal flow condi-
tions. These controls do not fail-safe.
E
1"
8-13/16"
5 Conduit
Outlets
72° Apart
or
C
6 Conduit
Mounting
Outlets
Lug Centers
60° Apart
Model
Volts 3Ø kW
NWHO-4590
240 or
90
480
NWHO-45125
240 or
125
480
NWHO-45150
240 or
150
480
NWHO-45175
240 or
175
480
NWHO-45200
240 or
200
480
NWHO-77220
240 or
200
480
NWHO-77225
240 or
225
480
NWHO-77250
240 or
250
480
NWHO-108300
240 or
300
480
NWHO-108325
240 or
325
480
NWHO-108350
240 or
350
480
CAUTION: Users should install adequate back-
up controls and safety devices with their
electric heating equipment. Where the con-
sequences of failure may be severe, back-up
controls are essential. Although the safety of
the installation is the responsibility of the user,
Chromalox will be glad to make equipment rec-
ommendations.
2
Dimensions (In.)
No. 3Ø
Ckts
A
B
5
72-1/2
25-1/2
63-5/8
5
87-1/2
25-1/2
78-5/8
5
102-1/2 25-1/2
93-5/8
5
117-1/2 25-1/2
108-5/8 18-3/16 12-1/2
5
125
25-1/2
116-1/8 18-3/16 12-1/2
6
97-1/2
27-3/4
88-5/8
6
105-1/2 27-3/4
96-5/8
6
113-1/2 27-3/4
104-5/8
6
98-1/2
29-1/2
89-5/16
6
104-1/2 29-1/2
95-5/16
6
110-1/2 29-1/2 101-1/16 19-3/8
C
D
E
18-3/16 12-1/2
18-3/16 12-1/2
18-3/16 12-1/2
19
13-3/4
19
13-3/4
19
13-3/4
19-3/8
14-1/2
19-3/8
14-1/2
14-1/2
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