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Raritan Electric Water Heater




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Engineering Company Inc
Electric Water Heaters
With or Without Optional Heat Exchanger
INSTALLATION AND MAINTENANCE INSTRUCTIONS
MOUNTING THE HEATER water t o run a few minutes to expel all air from water
The heater should be installed in a location where it heater and lines This is VERY IMPORTANT because
will not be subjected to external water if air remains in the heater and the electric heating
salt water The life of a heater will begreatly extended element is not fully submerged the element will burn
by choosing a protected location A heater located out when the power is turned on
in a sail locker for example cannot be expected t o The safety relief valve should be connected to hose or
last as long as one installed in a clean dry engine piping so that overflow can run unrestricted into the
room Mount the heater so that the electrical cover bilge This will prevent any overflow or dripping from
plates plumbing nipples and heat exchanger if used causing damage to the heater jacket or base
are accessible
Using the three mounting lugs provided securely ELECTRICAL
mount the heater t o the deck or other sturdy area CAUTION No 115 or 230 volt AC wiring should be
I t is preferable that bolts nuts and lockwashers be done by other than a qualified electrician
used but if wood screws or lag bolts must be used Protect the 115 volt shore line with a 15 amp fuse or
they should be heavy enough t o support the strain circuit breaker 10 amp for 230 volt units a Ground
when the heater is filled with water and the boat is Fault Circuit I nterrupter G FCI in the correct value
rocking Raritan 20 gallon water heaters R20 R20E may be included in the installation for additional
NP20 require auxiliary bracing to support the weight safety Use only STRANDED 123 cable t o the
of the tank filled with water when the boat is in heater Never use solid wire ROMEXtype cable
heavy seas Likewise i t is desireable to add auxiliary on a boat vessel vibration can cause solid wire to
bracing to the 6 and 12 gallon models especially if break due t o metal fatigue US Coast Guard In
the boat may be subject to excessive heeling and running the cable to the heater support it securely at
pitching in heavy seas frequent intervals Do not run it in the bilge Allow
about 12 of extra wire to make necessary connect
PLUMBING ions Remove the large rectangular cover which gives
To connect the heater t o the cold water supply in access to the electrical connection points Strip 8
stall a tee in the cold water supply line From the of the outer insulation from the end of the cable
branch of the tee connect a line to the lower exposing the three separate insulated wires Loosen
heater connection marked COLD A check valve the strain relief connector in the smaller cover plate
MUST be in this line to prevent hot water backflow and insert the cable Tighten the strain relief con
into the cold water lines Also it is a good idea to nector onto a portion of the cable that was not
install a drain valve between the check valve and the stripped Strip the insulation from the three wires
heater to bare about of the stranded wire Attach black
The upper heater connection marked HOT is con and white wires to thermostat per installation dia
nected to the hot water faucets shower etc Heat gram Use crimpon terminal ends for a secure install
resistant flexible hose or poly tubing suitable for the ation Do not use solder to connect wires as it in
temperature and pressure limits of the safety relief effect makes a solid wire of the strands subjecting
valve 75 PSI and 210 degress F may be used for it to the possibility of breaking due t o metal fatigue
both cold and hot connections Secure all lines to from vibration Join the green wire t o one of the four
the boats structure a t frequent intervals mounting bolts on the heating element using a crimp
Avoid sharp bends and 90 degree ells in the plumbing on terminal end Place the terminal protector in its
wherever possible as they reduce water flow Should correct position replace the access cover and double
copper fittings be desired avoid applying heat to the check t o be sure the tank is filled with water before
nipples protruding from the heater Solder fittings turning on electricity This can be verified if cold
first then connect to the heater the nipples contain a water runs out of any hot water faucet After turning
nonmetallic lining which will be destroyed by heat
from soldering fittings After all hot water lines
on the electricity the water should be noticeably
warm within 30 minutes Twenty gallon models R20
have been completely installed open the hot water R20E NP20 will take somewhat longer to initially
taps and turn on the water pressure system Allow the heat the ON THE ELECTRICITY WITH NO ELEMENT
IN A VERY SHORT TIME The pre To determine the proper setting of the gate valve 4 best winterized together with the
onboard water pres
WATER IN THE TANK OR WITH THE WATER ceding warning must also be remembered during the
engine should be operated at full throttle with the sure system This is accomplished by pumping all
LEVEL BENEATH THE IMMERSION HEATING springtime gate valve wide
open When the engine temperature the water from the boats fresh water tanks then
ELEMENT WILL BURN OUT THE HEATING has
stabilized gradually close the valve until the pouring nontoxic antifreeze solution propylene
engine temperature begins to rise The valve should glycol NOT ethylene glycol directly into the fresh
then be reopened enough to establish the proper water tanks Turn on the water pressure pump and
engine operating temperature Engine temperature open all faucets When the antifreeze solution comes
Replaceable anode insi
I A I should be monitored to verify that the entire cooling
system is functioning correctly
out of all faucets both hot and cold the whole
system is safe including the pump As a large quantity
of antifreeze is required to get the correct ratio of
this removable nipple The information above is only a general guideline and
DIMENSIONS any
installation is made at the risk of the installer antifreeze to water it is not usually an economical
No to Raritan Engineering Company method but it is by far the safest
MODEL A B C D E Inc is
to be presumed or implied from these general An alternate method is to shut off the electricity
instructions open all hot water taps on the boat to relieve the
6gal 14 16 114 10 1 1 8 3332 7 112
pressure then remove both lines from the heater and
ADDING A HEAT EXCHANGER allow it to drain After it has drained blow it out
12gal 1 8 159116 1018 3332 7112 TO AN EXISTING
ELECTRICONLY with air pressure if available then pour a quart of
WATER HEATER nontoxic antifreeze into the tank using a funnel and
20gal 18 255116 191116 3332 7112
Adding a heat exchanger to Raritan Water Heaters a length of hose Be sure electricity remains off
to allow the water to be heated via the engine cooling until spring When in the spring run
Heat Exchanger opening does not appear on NP series system is
only possible on RSeries water heaters water long enough to insure that all antifreeze has
R6 R12 R20 NPSeries NP6 NP12 NP20 do been flushed out BEFORE TURNING ON THE
not have a threaded opening to accomodate the addi ELECTRICITY Optional heat exchangers are winter
INSTALLATION o Water
tion of a heat exchanger We do not recommend ized in conjunction with the boats engine cooling
Excess Temperature
attempting the addition of a heat exchanger to system
Service Lines Pressure Safety Valve RSeries water heaters manufactured prior to
1980
To Overboard as they utilize a metal plug that has been installed
115 Volts AC

under high torque at the factory to eliminate possible
Black to Power Line leaks Recent RSeries water heaters
1980 to date PROBLEM Water does n o t get hot
Red Reset Button Electric Comes From Thermostat On utilize a special plastic plug that
is installed only hand 1 No electric power to heater Be sure circuit breaker
Engine Hottest Water tight at the factory The plastic plug is more readily or switch is turned on fuses are intact and wiring is
Raw Water Cooling removed when converting to the heat exchanger not broken or
Goes To Jacket On option Metal plugs installed before 1980 are
virtu 2 Bad heating element Turn off power remove access
Exhaust Manifold Riser
ally impossible to remove after years of repeated cover and depress red RESET button Restore power
Fresh Water Cooling
Goes To Expansion Or
heating and cooling If no warm water after 30 minutes check heating
When ordering a replacement water heater we suggest element and thermostat
the ESeries be ordered R6E R12E R20E These A Shut off power and diconnect the two wires
units are shipped with a factory installed heat ex connected to the heating element Check for conti
changer This allows the heater to be installed in the nuity through the heating element with an ohmmeter
CAUTION Heater must be filled with water Before Power is turned on electriconly with the heat
exchanger If no continuity heating element is burned out
available to be connected at a later date or it may be and must be replaced If continuity is EXCHANGER
A GENERAL GUIDELINE TO SHOW HOW A POR installed in the dual configuration with no changes
element is good check thermostat
TION OF THE ENGINE COOLANT MAY BE Dl required later B Replacing the
heating element Turn off power
The Raritan Heat Exchanger is furnished with a male
2 NPT thread to f i t the opening provided in the tank VERTED TO 3YIE OPTIONAL HEAT EXUlAN
to heater then turn off water pressure pump and
Two NPT female threads are provided in the heat GER
MAINTENANCE WINTERIZATION open all hot water faucets When water has for connection to hoses or piping from
AND flowing
pressure has been relieved drain water
engine coolant Because of the diversity of marine
Little maintenance other than proper winterization is heater the rest of the way through drain valve if
cooling it is not possible to provide required of the
Raritan Water Heater Periodic visual installed or by removing cold water inlet hose or
universal installation instructions the installer MUST
inspection should be done to insure that connections pipe at bottom of tank between tank and check
follow engine THE are tight wires are not frayed
and that grounding valve Remove access cover two wires connected t o
FOLLOWING DIAGRAM IS INTENDED ONLY AS of
the unit is sound These checks should be in heating element and four heating element mounting
corporated into the annual commissioning and winter bolts Remove the heating element discarding the
LEGEND layup of the boat as a minimum and should be done cylindrical rubber gasket Install
the new element and
1 Hottest Water from Engine Full Flow more often if possible rubber gasket never reuse old gasket
with the
2 PipeTee Full Flow on Run NPT on Branch A removeable magnesium anode is integral with the arrows on the heating element flange
pointing up and
MOTE Some marine engines run at higher 3 Hose to Hot Water Heat Exchanger hot
water outlet fitting I t should not be necessary down Be sure to reconnect the ground wire than the range of the pressure
4 Gate Valve Sized to Permit Full Flow of Coolant to inspect or replace the anode unless nect the black and
white wires to the new valve on the water heater For use with 5 Pipe Tee Full Flow on Run NPT on
Branch unusual smell or taste develop in the water The element Close drain valve or reconnect engines an alternate location for
source 6 Hose from Hot Water
to cold water inlet of water heater With hot water
water will have to be selected See safety
annode is replaceable as a unit and may be ordered
7 Full Flow Return to Engine Cooling System faucets open and ELECTRICITY TURNED
OFF to
valve problems under from Raritan
dealers or from the factory Specify
3 6 6 12 or 20 gallon model the water heater
turn on water pressure pump Allow
pump t o run a few minutes to expel air from the
lines then shut off faucets Restore power Check
WINTERIZATION for leaks around the heating element while waiting
Before beginning be sure electricity is for the water to heat If no leaks replace the cover
turned off to the water heater The water heater is plate If a leak appears turn off power drain tank
and check cylindrical gasket be sure it is seated is running the operating temperature of the
may be in excess of the relief valves rating This will
3 Bad thermostat If the ohmmeter shows conrinuity usually show up on the first major cruise or on a
through the heating element but the water is not heat shakedown cruise The situation described is possible
ed a bad thermostat is indicated with certain fresh water cooled engines that oper
A Turn off power t o heater depress red RESET ate at over 200 degrees F Engine coolant is and turn thermostat to highest setting Dis
tapped off just ahead of the coolint systems heat
connect both wires t o heating element Check for exchanger where the water is hottest then fed to with an ohmmeter through the
thermostat heat exchanger in the water heater The cure is t o
from black wire terminal t o black wire terminal and tap the coolant DOWNSTREAM of the heat exchang
from white wire terminal to white wire terminal er where the coolant is a t a lower temperature Check
Each side must show continuity If continuity is not the temperature of the coolant piped to the on either side the thermostat must
be re heater to be sure it is not over 170 degrees F
placed If thermostat tests good after heating element
also tested good recheck that power is available t o PROBLEM Constant dripping o f the relief valve re
unit Check wiring for breaks etc gardless o f temperature
B Replacing the thermostat Turn off power re This is usually caused by foreign matter lodged in the
move access cover to expose thermostat terminals seat of the pressure relief valve Shut off fresh both sets of wires from the
thermostat pressure pump shut off electricity and open hot water
Snap the thermostat out of i t s mounting and insert taps t o relieve pressure in the system Drain water
new one Reconnect both sets of wires to the thermo from tank until it is beneath the level of the relief
stat Wire the thermostat according to the Installation valve Remove the relief valve and clean it ignoring additional terminals that
may be Open the actuating handle and flush the valve with
on the new thermostat Fill heater with water then lukewarm water Be sure no sediment remains on the
turn on electricity Water should be noticeably warm seat of the valve plunger Close valve and 30 minutes
using tape dope or pipe joint compound Refill Safety valve opens and releases h o t water expel air from
the lines then turn on Take care to avoid scalding safety valve is preset Observe the relief valve as the tank fills and as the
to open a t 210 degrees F Remove the access cover water heats I t should remain closed and not drip
and check temperature setting on thermostat Facto If dripping begins again replace the valve
ry setting is 130140 degrees F If setting is higher
turn it all the way t o the left Allow heater to operate
an hour and observe results If lowering the temper
ature setting doesnt cure the problem perform the If further help is required or if an unusual Shut off electricity to the heater
and ob should develop contact Raritan Customer Service in
serve if the water flow stops over the next few hours Millville NJ or Ft Lauderdale FI for assistance
If the water flow doesnt stop as the tank cools down Any replacement part for a Raritan Water Heaters
a defective pressure relief valve is apparent Unscrew ordered from Raritan dealers or direct from the
and replace it after turning off the electricity and factory When ordering heating elements the tank If the water stops flowing as
the whether 115 or 230 volt When ordering anodes drops a defective thermostat is indicated sheet metal parts specify
whether 6 12 or 20 gallon
Replace the thermostat following by earlier directions unit Relief valves thermostats heating elements
2 I f the heater is equipped with an optional heat ex gaskets and heat exchangers are and the relief valve opens while the engine
between the three sizes
SAVE THESE INSTRUCTIONS
To order replacement parts or t o request additional in
formation or assistance contact Raritan Customer
Service at
530 Orange Street PO Box 1157 Millville NJ 08332 USA
mpany Inc
Telephone 60918254900
TWX 5106877545 RARITAN M IVE
Southern Office and Plant
3101 sw Second Avenue Fort Lauderdale FL 33315 USA
Telephone subject t o change without notice Printed in USA
HWHM187

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