FAQs IMMERSION HEATERS INSTALLER TIP SHEET

Hot Water Energy Storage
THE
HOT WATER
PEOPLE
INSTALLER
TIP SHEET
FAQs IMMERSION
HEATERS
Q. Can a Thermostat be changed without draining
the complete Cylinder?
A. Yes
A.
1.Ensure the power
supply is isolated before
removing the immersion
heater cover.
1
2
3
4
5
10°C 25°C 40°C 55°C 70°C
Q.Is there a reset button
on a Cotherm TSE00187
Thermostat?
2.Disconnect the electrical
connections from the
thermostat body.
Reset
A.Yes It is situated above
the number 1 on the
temperature scale and
is marked (Safety)
3.Carefully withdraw the
thermostat and replace
with a suitable new
thermostat.
4.Reconnect the electrical connections.
Note – With Plug in thermostats resistance will be felt when with
removing the faulty thermostat, care should be taken not to twist the
thermostat from side to side during its removal. When replacing the
plug thermostat with a replacement care must be taken to ensure
correct location of the male tag into the tightened female Tag.
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Q.What are the
temperature settings
on a Thermowatt RTS3
Thermostat?
A.A. Operating Trip –
Single Dot is the lower
limit and Double Dot is
the higher limit.
Red Dial 52° – 60°C (75°C Safety Cut-Out)
Q.How do I connect
the wiring to
a Cotherm
TSE00187
Thermostat?
Q.Where is the reset
button on a Thermowatt
RTS3 Thermostat?
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A. A = Live (Brown)
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B = Neutral (Blue)
Q. What are the temperature
setting on a Cotherm TSE
00187 Thermostat?
Neutral
Live
A.It is situated in a
small recess above the
temperature control dial.
Reset
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Hot Water Energy Storage
FAQs IMMERSION
HEATERS
Q. My Immersion Heater needs replacing how I know
what to buy?
Q. How do I find out the length of my immersion
heater?
A. All our Immersion heaters have a product code
either on the side wall of the cover or on the top of
the cover. This code will be a series of letters and
numbers please see images.
A. The only way to be certain of the length of your
immersion heater is to measure from the underside
of the brass boss to the end of the heating element.
However if your immersion heater is fitted in the
side wall of your hot water cylinder (horizontally)
then it will usually have a length of between 11 and
16 inches. If it is fitted to the top of your hot water
cylinder (vertically) then it usually has a length of
18 to 36 inches dependant on the size of your hot
water cylinder.
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<
14”
Q. Do all domestic Immersion Heaters require a
second level of protection against over temperature
operation?
A. Yes this can take 3 different forms.
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+ 8”
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= 22”
Immersion Heater
Q. My Immersion heater is not working –
How do I know what’s wrong?
Single Dual function
thermostat.
Single control
thermostat and
separate over
temperature manual
reset button cut out.
Single control
thermostat with a
second manual reset
over temperature
thermostat.
A. There are 5 possible reasons for the immersion
heater to stop working.
1. There is no electricity supply to the immersion heater.
2.The over temperature trip in your Immersion heater’s
thermostat has cut out.
Q. I can not find the product code for my immersion
heater what information do I need to purchase the
correct replacement?
3. The thermostat in your immersion heater is faulty.
A. You will need to know the length of your immersion
heater, the Power rating in watts, the size of the
thread of the brass boss and whether your hot
water system is vented or unvented.
5.The immersion heater has gone open circuit.
Q. H
ow do I know the size of
the thread on my immersion
heater brass boss?
A.All domestic immersion
heaters have a BSP thread
size on the brass boss.
The actual measurement across the
diameter of this boss is 0.25 inches
larger than the stated BSP thread
size. For example a 2.25 inch BSP
thread will have a diameter of approx
2.5 inches see attached illustration.
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2.5”
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4.The immersion heater has failed to earth.