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W A T L O W
Circulation Heaters
Tubular and
Process Assemblies
Circulation Heaters
Engine Preheaters
Application Hints
• Mount engine preheaters in
horizontal position only (as shown
in Figures #1, #2 and #3). Consult
your Watlow representative if
vertical mounting is unavoidable.
• Mount the heater near or below
the lowest point on the engine
block. Keep outlet nozzle pointed
up, as indicated on the tank.
• Estimate kilowatt requirements
with the following formula. First
determine the engine
displacement, then multiply:
English
Cubic inches X 3 = estimated wattage
Metric
Liters X 183 = estimated wattage
Application: Ethylene Glycol/Engine Coolant
1.13 20
7
⁄8 (530) CPBPL2S12➀ 12 (6)
1.50 20
7
⁄8 (530) CPBPB6S12 CPBPB2S12➀ 12 (6)
1.69 20
7
⁄
8 (530) CPBPM2S12➀ 12 (6)
1.88 20
7
⁄8 (530) CPBPN2S12➀ 12 (6)
2.00 20
7
⁄8 (530) CPBPC6S12 12 (6)
2.25 20
7
⁄
8 (530) CPBPD6S12 12 (6)
2.25 26
11
⁄16 (678) CPBPD2S12➀ 15 (7)
2.50 20
7
⁄8 (530) CPBPE6S12 12 (6)
3.00 26
11
⁄
16 (678) CPBPF2S12➀ CPBPF7S12 15 (7)
3.75 26
11
⁄
16 (678) CPBPG2S12➀ 15 (7)
4.00 26
11
⁄16 (678) CPBPH7S12 15 (7)
5.00 26
11
⁄
16 (678) CPBPJ7S12➀ 15 (7)
Overall Code No. Est. Ship.
kW
Length
120/240VÅ(ac) 208VÅ(ac) 240/480VÅ(ac) Weight
Inch (mm) 1-Phase 1-Phase 1-Phase lbs (kg)
Figure 1
All preheaters are Stock unless
otherwise noted.
Availability
Stock: Same day shipment
Standard: Four weeks
➀ Standard
Overall Length ±
3
/8
"
(10 mm)
1
1
/2
"
(38 mm)
2
1
/4
"
(57 mm)
Ref. Diameter
(4) Mounting Slots
9
/32
"
X
3
/4
"
(7 mm X 19 mm)
4
5
/8
"
(117 mm)
3
3
/4
"
(95 mm)
1
"
(25 mm)
2
"
(50 mm)
(4)
1
/4-20
Bolts,
5
/8
"
(16 mm)
Threaded
Length
2
3
/16
"
(56 mm)
6
3
/16
"
(157 mm)
3
1
/8
"
(79 mm)
6
3
/8
"
(162 mm)
Up Outlet
4
5
/8
"
(117 mm)
Outlet Nozzle
Sized for 1" I.D.
(25 mm) hose
Vibration
Isolator Bushings
Mounting Slots
1
/4
"- 20
Mounting Bolts
(2) Mounting Studs
Drain
NEMA 1 Terminal Enclosure
WATROD Heating Element
Thermowell
Check Valve
Inlet Nozzle
Sized for 1" I.D.
(25 mm) hose
F.O.B.: Hannibal, Missouri