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Model Volts Phase kW Heating Element
NWHO-1830R15 240 3 ▲▲ 30 155-013185-331
NWHO(F)-1830R15 240 3 ▲▲ 30 155-045301-013
NWHO-1830R15 480 3 ▲▲ 30 155-013185-332
NWHO(F)-1830R15 480 3 ▲▲ 30 155-045301-014
NWHO-1840R15 240 3 ▲▲ 40 155-013185-004
NWHO(F)-1840R15 240 3 ▲▲ 40 155-045301-016
NWHO-1840R15 480 3 ▲▲ 40 155-013185-005
NWHO(F)-1840R15 480 3 ▲▲ 40 155-045301-017
NWHO-1850R15 240 3 ▲▲ 50 155-013185-007
NWHO(F)-1850R15 240 3 ▲▲ 50 155-045301-019
NWHO-1850R15 480 3 ▲▲ 50 155-013185-008
NWHO(F)-1850R15 480 3 ▲▲ 50 155-045301-020
NWHO-1860R15 240 3 ▲▲ 60 155-013185-010
NWHO(F)-1860R15 240 3 ▲▲ 60 155-045301-022
NWHO-1860R15 480 3 ▲▲ 60 155-013185-011
NWHO(F)-1860R15 480 3 ▲▲ 60 155-045301-023
NWHO-1870R15 240 3 ▲▲ 70 155-013185-013
NWHO(F)-1870R15 240 3 ▲▲ 70 155-045301-025
NWHO-1870R15 480 3 ▲▲ 70 155-013185-014
NWHO(F)-1870R15 480 3 ▲▲ 70 155-045301-026
NWHO-1880R15 240 3 ▲▲ 80 155-013185-016
NWHO(F)-1880R15 240 3 ▲▲ 80 155-045301-028
NWHO-1880R15 480 3 ▲▲ 80 155-013185-017
NWHO(F)-1880R15 480 3 ▲▲ 80 155-045301-029
RENEWAL PARTS IDENTIFICATION
Note: The “F” in NWHO(F) means forced circulation (ie: equipped with baffles.) When replacing the heating element, care must be taken that the baffles line up properly with the inlet and outlet pipes. The top of the
flange of replacement heating elements for forced circulation heaters is stamped near one edge with the letter “P”. The sub-assembly is positioned correctly when the “P” on the flange is in line with the inlet and out-
let pipe. Incorrect placement will result in hindered circulation and possible failure of the element.
Note: When ordering parts for Model Numbers suffixed by “XX” or any other letter or letters not specifically identified on this instruction sheet, order Renewal Parts on special order basis, giving name of part, part
number and description.
MAINTENANCE
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do so
could result in personal injury or property damage.
Heater must be installed by a qualified person in
accordance with the National Electrical Code, NFPA
70.
1. Remove heating element assembly periodically to check heater
sheath for scaling, corrosion or excessive oxidation. Correct oper-
ating conditions to minimize sheath deterioration.
2. Periodically check temperature control and limit control operation
to insure accurate and safe process operation.
3. Check all electrical connections periodically and retighten connec-
tions which may have loosened in service. Replace wire and wire
terminals which show signs of oxidation which would interfere
with establishment of reliable electrical connections.
Regular Oil Heaters
Model Volts Phase kW Heating Element
NWHO-1820F15 240 3 ▲▲ 20 155-013185-019
NWHO(F)-1820F15 240 3 ▲▲ 20 155-045301-001
NWHO-1820F15 480 3 ▲▲ 20 155-013185-020
NWHO(F)-1820F15 480 3 ▲▲ 20 155-045301-002
NWHO-1825F15 240 3 ▲▲ 25 155-013185-022
NWHO(F)-1825F15 240 3 ▲▲ 25 155-045301-004
NWHO-1825F15 480 3 ▲▲ 25 155-013185-023
NWHO(F)-1825F15 480 3 ▲▲ 25 155-045301-005
NWHO-1830F15 240 3 ▲▲ 30 155-013185-025
NWHO(F)-1830F15 240 3 ▲▲ 30 155-045301-007
NWHO-1830F15 480 3 ▲▲ 30 155-013185-026
NWHO(F)-1830F15 480 3 ▲▲ 30 155-045301-008
NWHO-1835F15 240 3 ▲▲ 35 155-013185-028
NWHO(F)-1835F15 240 3 ▲▲ 35 155-045301-010
NWHO-1835F15 480 3 ▲▲ 35 155-013185-029
NWHO(F)-1835F15 480 3 ▲▲ 35 155-045301-011
NWHO-1840F15 240 3 ▲▲ 40 155-013185-031
NWHO(F)-1840F15 240 3 ▲▲ 40 155-045301-031
NWHO-1840F15 480 3 ▲▲ 40 155-013185-032
NWHO(F)-1840F15 480 3 ▲▲ 40 155-045301-032
NWHO-1845F15 240 3 ▲▲ 45 155-013185-034
NWHO(F)-1845F15 240 3 ▲▲ 45 155-045301-034
NWHO-1845F15 480 3 ▲▲ 45 155-013185-035
NWHO(F)-1845F15 480 3 ▲▲ 45 155-045301-035
Fuel Oil Heaters
OPERATION
FIRE/EXPLOSION HAZARD. Do not exceed the
Pressure-Temperature rating of the flange as listed in
ANSI B16.5.
IMPORTANT: It is the responsibility of the purchas-
er of the heater to make the ultimate choice of
sheath material based upon his knowledge of the
chemical composition of the corrosive solution,
character of the materials entering the solution,
and controls which he maintains on the process.
Sheath corrosion can result in a ground fault
which, depending upon the solution being heated,
can cause an explosion or fire.
1. Do not heat solutions that are corrosive to the heating element
sheath or the heating chamber.
2. Terminal ends of heater must be protected from drippings, con-
densation, spray or direct spill-over of material. Their presence at
the terminals may damage heater electrical insulation. Liquid-tight
terminal enclosures are available to protect heater. Check with
local sales office.
3. If foreign material is carried by the liquid flow, install suitable fil-
ters in the inlet pipe line to the heater.
4. Do not allow heater to operate when liquid flow is interrupted.