Water-heater
Trouble-shooting
General functioning
Wiring diagram
How to identify a water-heater
Installation, general tips
How to verify the Ohm on the heating element 750W
How to verify the Ohm on the heating element 1200W
How to verify the Ohm on the heating element 2000W
How to replace the heating element
How to replace the gaskets
How to replace the thermostats
How to replace the heating element bracket
How to reset the thermal cut-off thermostat
How to replace the mixing valve
How to replace the pressure relief valve
How to fill up the water-heater
How to empty the water-heater
How to replace the installation brackets
How to replace the plug
The automatic differential switch triggers when plugging the water-heater
How to replace the plastic cover
Heating elements – Powers and compatibility
General functioning
General functioning
The Isotemp water-heater allows to heat water up on board using two simple
methods:
• With the electrical immersion heating element
• Using the heat exchange coil connected to the engine cooling system
Due to the power required to heat the water up the heating element works only with
230V/750W
A 115V/750W heating element is available on demand.
On some models it’s possible to install more powerful heating elements.
General functioning
In a standard horizontal installation the
heating element is bent so it can heat
the water in lowest section of the
water-heater.
In a vertical installation the heating
element is completely submerged in
water so the warmest water goes to the
top of the heater.
The heat exchange coil is installed on
the bottom of the tank in order to better
exchange heat.
General functioning
Fresh water
inlet
Warm water
outlet
Heat
exchange coil
General functioning
Fresh water
inlet
Warm water
outlet
Heat
exchange coil
The warm water
pipe is positioned so
that, whether the
installation is
horizontal or vertical
, the water is always
tapped from the
warmest spot
General functioning
NPT = National Pipe Thread
BSP = British Standard Pipe
The difference between NPT and BSP is that they have the same thread but while
NPT is tapered BSP is not
General functioning
Fresh water
inlet
Warm water
outlet
Mixed water
outlet
The mixing valve allows to regulate the
temperature of the water exiting the
heater.
When the mixing valve is completely
closed the water temperature is +75°C
(167°F).
When the mixing valve is completely
opened the water temperature is
+38°C (100°F)
General functioning
The pressure relief valve has a double
purpose:
• Opens up when the pressure inside
the heater is higher than the valve
set pressure
• Allows the emptying of the heater
when needed rapidly
Attention: During the normal operation
it’s ok to have some water dripping
from the valve (half a glass per heating
cycle) as the pressure inside the heater
• Model for Basic & Slim: 7 bar grows slighlty higher than the set
pressure relief valve pressure of the valve.
• Model SPA: 6 bar pressure relief
valve
General functioning
The pressure relief valve has a double
purpose:
• Opens up when the pressure inside
the heater is higher than the valve
set pressure
• Allows the emptying of the heater
when needed rapidly
Attention: During the normal operation
it’s ok to have some water dripping
from the valve (half a glass per heating
cycle) as the pressure inside the heater
Model SPA ending with 100: 6 bar grows slighlty higher than the set
pressure relief valve pressure of the valve.
General functioning
To open the pressure relief valve turn it
counter-clockwise.
To close the valve either keep turning it
counter-clockwise or clockwise
General functioning
To open the pressure relief valve just
lift the lever
Wiring diagram
Wiring diagram
This wiring diagram is identical for every Isotemp water-heater
How to identify a water-heater
How to identify a water-heater
Product part number
Date of production
On the front stikcer there is all the data
of the heater. The two most important
data are highlighted
Installation, general tips
Installation, general tips
Fresh water
1 2 3 inlet
Warmest spot
where water
is taken from
The Isotemp water-heater can be installed both horizontally or vertically (figures 1 and 3) and in every position in between as
long as the fresh water inlet is always at the bottom.
Installation, general tips
It is advisable during installation to
mount a hose on the pressure relief
valve.
During the heating cycle it’s possible to
lose up to a half glass of water.
Emptying the water-heater is a lot
easier too.
Also on the SPA model ending with 100
it’s advisable to install a hose on the
pressure relief valve.
Installation, general tips
There are two kinds of valves on Isote,p
LK valve
water-heaters. The LK valve is standard on
all water-heaters while the other type of
valve is installed only on SPA water-
heaters with part number ending with 100.
Both valves work exactly in the same way
but there is a difference:
The LK valve allows a faster emptying but
does not work as a one-way valve.
Attention: in this instance it’s advisable to
Valve on SPA models ending with install a one-way valve right before water
100 inlet, especially if the water-heater is
installed closed to the autoclave.
The valve installed on the SPA model
ending with 100 is slower in emptying the
water-heater but works as a non-return
valve.
Remove the plug
before following the
instruction
How to verify the Ohms on the
heating element 750W
The fastest way to run this test is to use
the plug
Heating element values 750W
Ohm value on heating element 230V
750W
Ohm value on heating element 115V
750W
How to replace
Infinite resistor the heating
element
Remove the plug
before following the
instruction
How to verify the Ohms on the
heating element 1200W
The fastest way to run this test is to use
the plug
Resistor values 1200W
Ohm value on heating element 230V
1200W
Ohm value on heating element 115V
1200W
How to replace
Infinite resistor the heating
element
Remove the plug
before following the
instruction
How to verify the Ohms on the
heating element 2000W
The fastest way to run this test is to use
the plug
Resistor values 2000W
Ohm value on heating element 230V
2000W
The version 115V 2000W is not
available
How to replace
Infinite resistor the heating
element
How to replace the heating element
Remove the plug How to empty
before following the the water-
instruction heater
How to replace the heating element
Spare part number heating element
230V 750W: SEE00019LA
Dimensions: 33,4*6,8*2,6 cm
Weight: 230 grahams
Spare part number heating element
115V 750W: SEE00014HA
Dimensions: 33,4*6,8*2,6 cm
Weight: 230 grahams
How to replace the heating element
Spare part number heating element
230V 1200W: SEE00015LA
Dimensions: 42*6,3*3,6cm
Weight: 262 grahams
Spare part number heating element
115V 1200W: SEE00023HA
Dimensions: 42*6,3*3,6cm
Weight: 262 grahams
How to replace the heating element
Spare part number heating element
230V 2000W: SEE00016LA
Dimensions: 47*6,3*3,6cm
Weight: 285 grahams
How to replace the heating element
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to replace the heating element
Lift the cover
Remove the connections on the
heating element
How to replace the heating element
Remove the thermostat probes
Remove the ground cable
How to replace the heating element
With a wrench pipe #14 remove the nut
Now it’s time to remove the bracket
How to replace the heating element
Rotate the bracket by 90° counter-
clockwise
Remove the side opposite to the
heating element first
Attention: on Slim models bend the
connections of the heating element a
bit in order to remove the bracket
How to replace the heating element
Remove the nuts holding the heating
element
Remove the heating element
How to replace the heating element
Remove the gaskets
Reinsert the gaskets on the new
heating element
Attention: there are two kinds of
gaskets, 2 rigid gaskets and 2 soft
ones. The soft gaskets must be
inserted first and will remain inside
the heater
How to replace the heating element
Insert the heating element on the
bracket
Insert then the hard gaskets and the
nuts above them
How to replace the heating element
The correct position of the heating
element is slightly bent, this to allow
the heating element to heat the water
in the lowest part of the water-heater
Attention: when reinstalling the
brakcet it’s very important to have it
well placed in the center, make sure
the gasket is evenly set
How to replace the heating element
When reinstalling the bridge pay
attention to the positioning, the part
indicated by the arrow must be as in
the picture or the hole for the
thermostat probes will be covered.
Reconnect the ground cable and the
power supply connections.
When tightening the nut never use
more than a 8-10N force
Attention: when inserting the
thermostat probes it’s important to
insert them in the correct order:
cylindircal first and coil after
How to replace the gaskets
Remove the plug How to empty
before following the the water-
instruction heater
How to replace the gaskets
The gasket kit is made by:
• 1 large gasket
• 2 small soft gaskets
• 2 small rigid gaskets
• 2 fixing nuts
Spare part number: SDF00025AA
Dimensions:
Weight:
How to replace the gaskets
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to replace the gaskets
Lift the cover
Remove the connections on the
heating element
How to replace the gaskets
Remove the thermostat probes
Remove the ground cable
How to replace the gaskets
With a wrench pipe #14 remove the nut
Now it’s time to remove the bracket
How to replace the gaskets
Rotate the bracket by 90° counter-
clockwise
Remove the side opposite to the
heating element first
Attention: on Slim models bend the
connections of the heating element a
bit in order to remove the bracket
How to replace the gaskets
Remove the large gasket by pulling up
Replace the gasket, making sure it’s
well fitted to the bracket
How to replace the gaskets
Remove the nuts holding the heating
element
Remove the heating element
How to replace the gaskets
Remove the gaskets
Reinsert the gaskets on the new
heating element
Attention: there are two kinds of
gaskets, 2 rigid gaskets and 2 soft
ones. The soft gaskets must be
inserted first and will remain inside
the heater
How to replace the gaskets
Insert the heating element on the
bracket
Insert then the hard gaskets and the
nuts above them
How to replace the gaskets
The correct position of the heating
element is slightly bent, this to allow
the heating element to heat the water
in the lowest part of the water-heater
Attention: when reinstalling the
brakcet it’s very important to have it
well placed in the center, make sure
the gasket is evenly set
How to replace the gaskets
When reinstalling the bridge pay
attention to the positioning, the part
indicated by the arrow must be as in
the picture or the hole for the
thermostat probes will be covered.
Reconnect the ground cable and the
power supply connections.
When tightening the nut never use
more than a 8-10N force
Attention: when inserting the
thermostat probes it’s important to
insert them in the correct order:
cylindircal first and coil after
How to replace the thermostats
Remove the plug
before following the
instruction
How to replace the thermostats
Spare part number service thermostat:
SEA00041LA
Working temperature: 0°C/+75°C
(32°F/167°F)
Dimensions:
Weight:
Spare part number thermal cut-off
thermostat: SEA00042LA
Opening circuit temperature: +95°C
(203°F)
Dimensions:
Weight:
How to replace the thermostats
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to replace the thermostats
Remove the sticker on the plastic cover
Lose the marked screws to remove the
service thermostat
How to replace the thermostats
Lose the screws to remove the power
supply cables and lose the nut to
remove the thermostat
Attention: when inserting the
thermostat probes it’s important to
insert them in the correct order:
cylindircal first and coil after
How to replace the heating element
bracket
Remove the plug How to empty
before following the the water-
instruction heater
How to replace the heating element bracket
Spare part number: SBE00045AA
Dimensions:
Weight:
How to replace the heating element bracket
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to replace the heating element bracket
Lift the cover
Remove the connections on the
heating element
How to replace the heating element bracket
Remove the thermostat probes
Remove the ground cable
How to replace the heating element bracket
With a wrench pipe #14 remove the nut
Now it’s time to remove the bracket
How to replace the heating element bracket
Rotate the bracket by 90° counter-
clockwise
Remove the side opposite to the
heating element first
Attention: on Slim models bend the
connections of the heating element a
bit in order to remove the bracket
How to replace the heating element bracket
Remove the nuts holding the heating
element
Remove the heating element
How to replace the heating element bracket
Remove the large gasket by pulling up
Replace the gasket, making sure it’s
well fitted to the bracket
How to replace the heating element bracket
Insert the heating element on the
bracket
Insert then the hard gaskets and the
nuts above them
How to replace the heating element bracket
The correct position of the heating
element is slightly bent, this to allow
the heating element to heat the water
in the lowest part of the water-heater
Attention: when reinstalling the
brakcet it’s very important to have it
well placed in the center, make sure
the gasket is evenly set
How to replace the heating element bracket
When reinstalling the bridge pay
attention to the positioning, the part
indicated by the arrow must be as in
the picture or the hole for the
thermostat probes will be covered.
Reconnect the ground cable and the
power supply connections.
When tightening the nut never use
more than a 8-10N force
Attention: when inserting the
thermostat probes it’s important to
insert them in the correct order:
cylindircal first and coil after
How to reset the thermal cut-off
thermostat
In case the heater is either a Slim or s SPA it’s always necessary to
remove the plastic cover
How to reset the thermal cut-off thermostat
You can follow this instruction if there is
enough room to reset the thermostat
without having to remove the plastic
cover.
This depends entirely on the
installation of the heater.
Remove the sticker on the pastic cover
to get access to the thermostat
With a screwdriver reset the button
marked by the arrow
How to reset the thermal cut-off thermostat
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to reset the thermal cut-off thermostat
Below the plastic cover there is the
thermal cut-off thermostat that may
have triggered. Resetting the
thermostat is a manual operation.
The thermal cut-off thermostat opens
the circuit when the temperature of the
water gets to a temperature of +95°C
(203°F)
To reset the thermostat make sure the
red button is flush to the head of the
thermostat, just like in the picture.
If the button is proud of the head just
push it
How to reset the thermal cut-off thermostat
There are two scenarios in which the thermal cut-off thermostat triggers:
• Water has been heated up with the heat exchange coil; the temperature of th
liquid is over +95°C (203°F) so the thermostat triggers. In this case reset
manually the thermostat
• Water is heated up with the heating element. The thermal cut-off thermostat
triggers because the service thermostat is defective and doesn’t open the circuit
when the water temperature gets to +75°C (167°F). In this case it’s necessary to
replace the service thermostat
How to replace the mixing valve
Remove the plug How to empty
before following the the water-
instruction heater
How to replace the mixing valve
Spare part number: SFD00011AA
Dimensions:
Weight:
How to replace the mixing valve
Lose the fresh water pipe
With a wrench keep the valve still and
lose the lower nut
Attention: when replacing the mixing
valve tight the lower nut as much as
possible
Attention: the air screw must be facing
upward
How to replace the pressure relief
valve
Remove the plug How to empty
before following the the water-
instruction heater
How to replace the pressure relief valve
Spare part number 7 bar pressure
relief valve: SFD00023AA
Dimensions:
Weight: 112 grahams
Spare part number 6 bar pressure
relief valve (SPA models):
SFD00029AA
Dimensions:
Weight: 112 grahams
Sostituire la valvola di sicurezza
With the wrench lose the valve turnig it
counter-clockwise
Attention: when replacing the valve
make sure the water outlet is facing
downward
How to fill the water-heater
Remove the plug
before following the
instruction
How to fill the water-heater
Open a random hot water tap on the
boat
Turn the autoclave on.
In this way all the system will fill up. All
the air inside the system will be pushed
out.
Once water is getting out of the tap it
means all the system is filled with
water only and there are no air bubbles
How to empty the water-heater
Remove the plug
before following the
instruction
How to empty the water-heater
Attention: turn the autoclave off
before following this instruction.
Open the pressure relief valve
Open a random hot water tap on the
boat.
In this way all the water inside the
water-heater will get out through the
pressure relief valve and you can
proceed with any maintenance needed.
This process is mandatory when
winterizing the water-heater
How to replace the installation
brackets
How to replace the installation brackets
Spare part number installation brackets
kit for Basic 24-30-40-50-75 (2 pieces):
SGB00047AA
Dimensions:
Weight:
Spare part number installation brackets
kit for Slim 15-20-25 (2 pieces):
SGB00049AA
Dimensions:
Weight:
How to replace the installation brackets
Spare part number installation brackets
kit for SPA 40-50 (2 pieces):
SGB00165AA
Dimensions:
Weight:
Spare part number installation brackets
kit for SPA Slim 15-20-25 (2 pieces):
SGB00166AA
Dimensions:
Weight:
How to replace the installation brackets
Use a pipe wrench #10 to lose the
bracket screw and replace them with
the new ones
How to replace the plug
Remove the plug
before following the
instruction
How to replace the plug
Spare part number EU plug:
SEB00096AA
Dimensions:
Weight:
Spare part number UK plug (13A fuse
inside): SEB00073AA
Dimensions:
Weight:
How to replace the plug
Spare part number USA plug:
SEB00080AA
Dimensions:
Weight:
How to replace the plug
Remove the fixing screws of the cover
Pull the cover out paying attention to
the plastic inserts on the back
How to replace the plug
Lose the screws on the thermal cut-off
thermostat to remove the plug cables
Remove the ground cable
How to replace the plug
Lose the screws on the plastic holder
of the plug
Remove the cable protection and
rubber.
Attention: remembert to insert the
rubber and cable protection on the new
plug
The automatic differential switch
triggers when connecting the plug
The automatic differential switch triggers when connecting the plug
Normally when the differential switch triggers when plugging the heater it’s because
the heating element is damaged somewhere and you need to replace it
How to replace
the heating
element
How to replace the plastic cover
Remove the plug
before following the
instruction
How to replace the plastic cover
Spare part number Basic cover:
SBE00047AA
Dimensions:
Weight:
Spare part number Slim cover:
SBE00095AA
Dimensions:
Weight:
How to replace the plastic cover
Spare part number SPA cover:
SBE00296AA
Dimensions:
Weight:
The SPA cover is identical for standard
and Slim models
How to replace the plastic cover
Remove the fixing screws of the plastic
cover
Attention: in case the heater is a SPA
or a Slim just remove the fixing screws
and skip all other steps
Pull the cover out paying attention to
the plastic inserts on the back
Sostituire la copertura di plastica
Remove the sticker on the plastic cover
With a screwdriver remove the marked
screws to remove the plastic cover
Heating elements – powers and
compatibilities
Heating elements – powers and compatibilities
Slim 230V-750W 230V-1200W 230V-2000W 115V-750W 115V-1200W
15 X (std) X
20 X (std) X X X
25 X (std) X X X X
Basic
24 X (std) X
30 X (std) X
40 X (std) X X X
50 X (std) X X X X
75 X (std) X X X X
SPA
15 X (std) X
20 X (std) X
25 X (std) X X X
30 X (std) X
40 X (std) X X X
Click on the desired heating element for spare part number
