Bajaj IWH-Mark II is an instant water heater with a 1 liter capacity, equipped with safety features like a safety valve, thermostat, fusible plug, and neon lamp. It has a 3kW heating element, ensuring quick water heating. The device can be used for single-point usage, where hot water is supplied at one point only. It's recommended to keep the outlet always open and use a gate valve at the inlet to control water flow. The thermostat automatically switches off the power supply when the desired temperature is reached and turns it back on when the water cools down.
Bajaj IWH-Mark II is an instant water heater with a 1 liter capacity, equipped with safety features like a safety valve, thermostat, fusible plug, and neon lamp. It has a 3kW heating element, ensuring quick water heating. The device can be used for single-point usage, where hot water is supplied at one point only. It's recommended to keep the outlet always open and use a gate valve at the inlet to control water flow. The thermostat automatically switches off the power supply when the desired temperature is reached and turns it back on when the water cools down.
bajaj electricals limited Page 1 of 5
Bajaj
Instant Water Heater
Dear Customer,
Congratulations! You are now the proud owner of a Bajaj Instant Water Heater, the most durable, dependable and
safe product in the market today. And we mean what we say.
Why? Because we at Bajaj understand your concern, your need for reassurance. So we designed our Instant Water
Heaters with one single minded objective - Safety. Total protection for you and your family, for years to come.
This manual will answer all your questions and remove your doubts. We have provided a detailed description of our
Instant Water Heaters and clear instructions for Installation and operation. Read this manual carefully, follow the
instructions and we guarantee you will never have to worry about your Instant Water Heaters again.
KNOW YOUR INSTANT WATER HEATER
Distinctive features and benefits (Refer Fig. 1)
How does it function?
1. Each Bajaj Instant Water Heater Unit is made of an outer body, inner tank, heating element and safety
devices like Safety Valve, Thermostat, Thermal cut-out and Fusible Plug.
2. Water enters into the inner tank through inlet pipe at normal working pressure of about 30 P.S.I.
3. When the tank is full (this becomes clear when water starts flowing through the outlet) switch ON the power
supply.
4. The heating element heats up the water to a pre-defined temperature. At this point the Thermostat or
Thermal cut-out (depending on the model) automatically switches OFF the power supply to the unit.
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Functioning of the Thermostat and/or Thermal cutout depending on the model you choose is explained
separately.
5. You can now draw the water out through the outlet. Depending on how hot you want the water, you can
control the flow at the inlet (non pressure type installation) or at the outlet (pressure type installation).
Greater the rate of flow, lesser the temperature of water drawn and vice-versa. Because of the design of the
heater and displacement principle, fresh cold water keeps entering through the inlet.
6. As temperature of water inside the tank drops, the Thermostat (in Mark-II & Mark-VI ISI models) again
switches ON the power supply to the heater. When this happens, water starts heating up again. This process
continues till you switch OFF the main power supply to the heater after usage. For Mark-V ISI model please
refer 'Functioning of Thermal Cut-out.'
How it is made?
Outer casing: It is made of superior quality, corrosion resistant, mild steel. This is powder-coated in a variety of
colours for an attractive, long-lasting, rust-resistant, two tone finish.
Inner tank: This is made in one-piece from superior grade 99.85% pure electrolytic copper. It comes with a 5 year
guarantee. It is suitable for both hard and soft water. It can handle pressure upto 100 P.S.I. (7.00Kg/cm
2
- as per BIS
specifications) Normal working pressure does not exceed 30 PSI (2.1 kg./cm
2
)
The Heating Element: The heating element is highly efficient, mineral filled and of 3KW rating. It is direct-immersion
type and housed in a copper tube. What's more, it is also 'Bajaj' and "ISI" marked.
Indicating lamps: These are red and green neon-gas filled lamps which indicate the functioning of Thermostat
and/or thermal cut-out. They are mounted on the heater unit itself.
Hardware: All screws, nuts and bolts used in the heaters are made of rest resistant stainless steel.
Safety Systems
All Bajaj Instant Water Heaters are provided with Pressure and Temperature control devices. These ensure complete
protection and smooth operation.
These safety devices are:
Safety Valve: This device is fitted on the inlet. It opens and starts dripping when the pressure inside the tank or at
the inlet exceeds 50 P.S.I. (3.5 kg/m
2
)
Thermostat: A 178 mm (7"), stem type, snap action automatic temperature control device set at 60 degrees celsius
is used. It is also "Bajaj 'and "ISI "marked.
The Thermal cut-out in Mark-V ISI model is a primary temperature controlling device. A 'Bajaj' marked snap action,
bimetallic temperature control device set at 90 degrees celsius is provided with a push button outside the unit. This
push-button can be reset by hand.
However, in Mark-VI ISI model this is a secondary temperature controlling device and set at 90 degrees Celsius.
Therefore, there is no resetting button provided outside the unit.
THIS DEVICE HELPS IN PREVENTING DRY HEATING OF THE ELEMENT INCASE THE UNIT IS OPERATED WITHOUT
WATER.
Fusible Plug: In the rare case that either the Thermostat or Thermal cut-out or both fail (depending on the model),
this plug melts and releases hot water and steam through the drain pipe. Thus, it prevents any untoward incidents.
This device can also be used to drain out the water when the unit is not in use for a long time or servicing has to be
done. However, it should be done through a qualified technician only.
Non return device: There is a siphon hole on the inlet pipe inside the inner tank. When pressure inside the tank
becomes low, this siphon hole prevents back flow of water. It acts as a non-return device upto a certain level of low
pressure. Thus it prevents collapse of the tank due to vacuum formation upto a certain level of pressure.
What are the benefits?
1. A two-year guarantee.
2. It can easily be opened for servicing. Rust resistant stainless steel hardware facilitates easy servicing.
3. Copper tank with 5 year guarantee.
4. It can be used both for single-point usage (Non pressure-type installation) and multi-point usage (pressure-
type installation). However Instant Water Heaters due to their design & Operation are recommended for
single point usage only.
5. Manufactured at India's first ISO-9002 certified units.
6. The largest dealer and after-sales service network available in the country.
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Technical Specification Table. Check where your Instant Water Heater Fits in.
(Ref Fig. 2)
(Dimensions in mm) Model Capacity
(in Litres)
Element
Rating
(in Kw)
Features
B D G H
Colours
IWH-Mark II 1.0 3.0 Safety Valve,
Thermostat ,
Fusible plug,
Neon Lamp.
365 183 185 105
IWH-Mark V ISI 1.0 3.0 Safety Valve,
Thermal Cut-
out, Fusible
plug, Neon
Lamp.
365 183 185 105
IWH-Mark VI ISI 1.0 3.0 Safety Valve,
Thermostat,
cut-out, Fusible
plug, Neon
Lamp
365 183 185 105
All models
are
available in
following
colours
Ivory white
Green,
Blue, Pink,
Grey
Due to continuous efforts for improvement, Specifications are subject to changes.
Mounting And Installation of Bajaj Instant Water
Heater (Fig. 2)
1. Mount the Instant Water Heater (IWH) at a suitable place on the
wall. Ensure that it's in a perfectly vertical position.
2. It is advisable to connect the unit to a D.P. switch fuse unit of 16
Ampere rating.
3. Connect the inlet of the unit to the supply line from the overhead
tank or municipal water supply as the case may be.
4. In case of pressure type installation (Multipoint usage) get a
licensed plumber/electrician to connect the outlet of the heater to
the various points of usage.
5. The cold and hot water pipes should not be connected directly to
the inlet and outlet of the heater. They should instead be
connected by flexible tubes of appropriate material. Never use
plastic tubes especially at the outlet as it cannot withstand the
heat. In case of direct pipe connections, tightening of couplings
using wrench can damage the heater unit. Use a control valve at
the inlet. Ensure that it is always kept open. (In Pressure Type
Installations)
6. The overall & mounting dimensions are shown in Fig. 2.
How to Operate? - Pressure Type installation. (Fig.
3)
1. With this installation you can take hot water out at more than one point of usage.
2. Allow the cold water to flow from the outlet.
3. Keep the Gate valve at the inlet ALWAYS
OPEN.
4. Switch ON the power supply to the unit.
5. The hot water flow at the usage point can be
controlled by the Gate valve provided at the
usage point.
6. Ensure that Pressure at the inlet is not more
than 50 PSI. In case it is more, install a
Pressure Reducing Valve at the inlet.
7. After use, first switch OFF the power supply.
8. Allow the hot water to flow out. This
enhances life of the element by preventing
scaling.
9. Close the gate valve at the usage point.
Under normal circumstances due to its design &
operation Instant Water Heaters are recommended for
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Single point usage only (Non-Pressure type lnstallation). However if multi-point usage is sought, Bajaj Instant Water
Heater Mark-VI ISI model is recommended for usage. This is due to the multiple safety features provided in this unit.
How to Operate? - Non Pressure Type Installation. (Fig 4.)
1. This type of installation supplies hot water at one
point only & is the safest recommended method of
installation & usage.
2. Keep the outlet ALWAYS OPEN. DO NOT CONNECT
GATE VALVE AT THE OUTLET.
3. Provide a Gate valve at the inlet as shown in the Fig. 3.
The hot water flow through the outlet is to be controlled
by this Gate valve.
4. Allow cold water to flow from the outlet.
5. Switch ON the power supply.
6. With the help of Gate Valve at the inlet you can control
the flow of hot water.
7. After use, first switch OFF the power supply.
8. Allow hot water to flow out. This prevents scaling of the
element and increases its life.
9. Close the Inlet Valve.
A. MARK - II - Operations of Thermostat
1. When the power supply is switched ON, the green lamp glows. This indicates that heating is ON.
2. At the set temperature of 60
o
C the green lamp switches OFF. This indicates that the thermostat has operated
and power supply to the unit has been switched OFF.
3. After water-cools down, thermostat automatically switches ON the power to the unit. This is indicated by the
switching ON of the green lamp.
4. This cycle continues till you switch OFF the main power supply to the unit after usage. Thus the switching ON
& OFF of the green lamp indicates the automatic functioning of the thermostat.
5. In the rare case that the thermostat fails, the fusible plug melts. This enables the release of hot water and
steam through the drain Pipe and prevents any untoward incidents. In such a case contact the nearest Bajaj
Sales or Service centre.
B. MARK - V - Operation of Thermal Cut-Out.
1. When the power supply is switched ON the green lamp glows. This indicates that heating is ON.
2. Under normal conditions of usage, the power supply to the unit is continuously ON.
When temperature of water inside the tank reaches 90
o
C the thermal cutout switches OFF the power supply
unit. The switching OFF of the green lamp indicates this. Power supply is also switched OFF when the unit is
operated without water. THUS THIS DEVICE HELPS IN PREVENTING DRY HEATING OF THE ELEMENT.
3. The Heater can be restarted by pressing the reset switch given at the bottom. This switch operates when
I) Water inside has cooled down.
II) Is completely refilled with cold water as per operating instructions. If the heater still does not restart,
contact the nearest Bajaj sales or service centre.
4. In the rare case of the Thermal cut-out failing, the Fusible Plug melts. This enables release of hot water and
steam through the drain pipe and prevents any untoward incidents. In such a case contact the nearest Bajaj
Sales or Service Centre.
C. Mark VI ISI - Operation of Thermostat and Thermal cutout.
1. The Bajaj Instant Water Heater MK-VI ISI model is provided with Double Safety System of Thermostat and
Thermal cut-out. The functioning of these temperature control devices is indicated by the green and red
lamps respectively.
2. When the unit is switched ON the green lamp glows. At the pre-fixed temp. of 60
o
C the green lamp switches
OFF indicating that the Automatic Thermostat has switched Off the power supply to the unit.
3. After the water has cooled down, or fresh cold water enters the unit, the Thermostat automatically switches
on the power supply to the unit and the green lamp glows ON. Thus the switching On & OFF of the green
lamp indicates the automatic functioning of thermostat.
4. The cycle continues till you have switched OFF the power supply to the unit.
5. When the thermostat fails to operate at the pre-Fixed temperature of 60
o
C the red lamp switches ON. This
indicates that thermal cut-out has operated at 90
o
c. the red lamp also switches ON when the unit operates
without water. In such cases contact the nearest Bajaj sales or service centre. THUS THIS DEVISE HELPS IN
PREVENTING DRY HEATING OF ELEMENT.
6. In the rare case that the Thermostat and Thermal cutout fails the fusible plug melts. This enables release of
hot water and steam. Thus it prevents any untoward incidents. In such a case contact the nearest Bajaj
Sales or Service Centre.
7. Please note that in this model, the thermal cut-out is not provided with a resetting mechanism outside the
unit. IT IS STRONGLY ADVISED NOT TO OPERATE THE UNIT BY RESETTING THE THERMAL CUT-OUT AS THE
THERMOSTAT NEEDS TO BE TESTED/ REPLACED.
Because this model has so many safety features, this unit is recommended for multi-point usage.
bajaj electricals limited Page 5 of 5
The Do's and Don'ts
1. Read installation and operating instructions carefully before use.
2. Get an authorised plumber to install the geyser.
3. Allow the water to flow out from the outlet. Only then, switch ON the power supply.
4. After use, make sure that power supply is switched OFF before closing the inlet (non-pressure type) or outlet
(pressure type)
5. Please ensure that proper earthing is provided to the unit.
6. Please contact the nearest bajaj Sales or Service Centre in case of any problem/non-operation of the unit.
7. The working of Thermostat in MK-II & MK-VI ISI should be checked once in a while by ensuring that the
green light glows ON & OFF when the unit is in use. The working of Thermal cut-out in MK-V ISI should be
checked in the same manner.
8. Always get the unit serviced at least once in two years. Use genuine spare parts when replacement is
necessary.
Don'ts
9. Do not provide a non-return valve at the outlet in case of Pressure type installation.
10. When the red light glows ON in MK-VI ISI model do not operate by resetting the thermal cut-out. Instead
contact the nearest Bajaj Sales & Service Station to test/replace the thermostat.
11. In case the fusible plug has operated and water flows from the drain, contact the nearest Bajaj Sales &
Service Station.
12. Under no circumstances the setting of the Thermostat or Thermal cut-out should be increased
beyond the preset temperature.
13. Safety valve, Thermostat, Thermal cut-out are preset and sensitive devices. Any
tampering/resetting them could damage the unit & even prove dangerous. This should be strictly
avoided.
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Bajaj IWH-Mark II User manual
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- User manual
- This manual is also suitable for
Bajaj IWH-Mark II is an instant water heater with a 1 liter capacity, equipped with safety features like a safety valve, thermostat, fusible plug, and neon lamp. It has a 3kW heating element, ensuring quick water heating. The device can be used for single-point usage, where hot water is supplied at one point only. It's recommended to keep the outlet always open and use a gate valve at the inlet to control water flow. The thermostat automatically switches off the power supply when the desired temperature is reached and turns it back on when the water cools down.
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