Worcester Greenstar 8000 Life Series User manual

6720883873 (2021/05) UK/IE
User Instructions
Gas fired condensing regular boiler
Greenstar 8000 Life
GR8300iW 30 R | GR8300iW 35 R | GR8300iW 40 R | GR8300iW 45 R | GR8300iW 50 R

Preface
Greenstar 8000 Life – 6720883873 (2021/05)
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Preface
Dedicated to heating comfort.
Thank you for purchasing a Worcester product. We pride ourselves on
manufacturing appliances to the strictest quality control standards
throughout every stage of production.
Worcester, Bosch group has led the field in innovative product design
and performance for over 50 years. This heritage means all our products
are of exceptional quality and proven reliability.
Our products employ the latest technologies and they are reliable,
extremely energy efficient, offering you economical running costs and
value for money. They are amongst the top energy rated appliances
available.
There is also the reassurance of our parts and labour guarantee. Our
Customer Service team is here to help you get the best from your
Worcester product throughout its lifetime. Whatever your enquiry, our
specially trained team is available at our Worcester based contact centre
and online via the website. For contact details see the back cover.

Table of contents
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Greenstar 8000 Life – 6720883873 (2021/05)
Table of contents 1 Explanation of symbols and safety instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimizing danger are not taken.
The following signal words are defined and canbe used in this document:
DANGER
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION
CAUTION indicates that minor to medium personal injury may occur.
NOTICE
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is no risk to
people or property.
Additional symbols
Table 1
1 Explanation of symbols and safety instructions . . . . . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 4
2 Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Appliance identification and serial number . . . . . . . . . . 5
2.2 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Maintaining your appliance . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Benchmark standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Prepare for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Open vented heating system . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Sealed heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2.1 Constantly re-pressurising the system . . . . . . . . . . . . . . 6
3.3 Topping up the system pressure . . . . . . . . . . . . . . . . . . . 7
4 Operating the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Control panel overview . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Symbols in the display . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Heating key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Key (accessories) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Installing the Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Key LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 Setting frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Thermal disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8 Clearances and ventilation information . . . . . . . . . . . . . . . . . . 9
8.1 Appliance clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.2 Ventilation information. . . . . . . . . . . . . . . . . . . . . . . . . .10
9 Malfunction or failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
9.2 Extreme cold weather . . . . . . . . . . . . . . . . . . . . . . . . . .11
9.3 System gassing troubleshooting . . . . . . . . . . . . . . . . . .11
10 Environmental protection and disposal . . . . . . . . . . . . . . . . .13
11 Tips on energy saving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
12 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
13 Energy consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
13.1 Product data on energy consumption . . . . . . . . . . . . . .16
Symbol Meaning
▶ a step in an action sequence
a reference to a related part in the document
• a list entry
–a list entry (second level)

Explanation of symbols and safety instructions
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1.2 General safety instructions
HNotices for the target group
These operating instructions are intended for the
heating system operator.
All instructions must be observed. Failure to comply
with instructions may result in material damage and
personal injury, including danger to life.
▶ Read and retain the operating instructions (heat
source, heating controller, etc.) prior to operation.
▶ Observe the safety instructions and warnings.
HDetermined use
The product may only be used for the heating of boiler
water and for DHW heating.
Any other use is considered inappropriate. We assume
no liability for damage occurring due to non-permitted
use.
HIf you smell gas
A gas leak could potentially cause an explosion. If you
smell gas, observe the following rules:
▶ Prevent flames or sparks:
– Do not smoke, use a lighter or strike matches.
– Do not operate any electrical switches or unplug
any equipment.
– Do not use the telephone or ring doorbells.
▶ Turn off the gas at the meter or regulator.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Move well away from the building: call the National
Gas Emergency Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the
side of the gas tank.
HDanger to life from poisoning by flue gas
There is a danger to life from escaping flue gas.
▶Never modify any parts through which flue gas is
routed.
If flues are damaged or leaking, or if you smell flue gas,
observe the following rules.
▶ Switch off the heat source.
▶ Open doors and windows
▶ Warn your neighbours and leave the building
immediately.
▶ Prevent third parties from entering the building.
▶ Notify an approved contractor.
▶ Have any defects rectified.
HDanger to life from carbon monoxide
Carbon monoxide (CO) is a poisonous gas, which
arises during the incomplete combustion of fossil fuels
such as oil, gas or solid fuels.
Dangers arise, if carbon monoxide escapes from the
heating system due to a fault or a leak and collects
unnoticed in enclosed spaces.
You can neither see, taste nor smell carbon monoxide.
To avoid danger from carbon monoxide:
▶ Have the heating system inspected and serviced
regularly by an approved contractor.
▶ Use a CO detector, which gives an alarm in good
time if CO escapes.
▶ If you suspect a CO leak:
– Warn your neighbours and leave the building
immediately.
– Call an approved contractor.
– Have any defects rectified.
HInspection, cleaning and maintenance
The user is responsible for ensuring the heating
system is safe and environmentally compatible.
Non-existent or improper inspection, cleaning and
maintenance may result in personal injury, including
danger to life or material damage.
We recommend that you enter into a contract covering
an annual inspection and responsive cleaning and
maintenance with an approved contractor.
▶ Have work carried out only by an approved
contractor.
▶ Have the heating system inspected by an approved
contractor at least once a year.
▶ Have any required cleaning or maintenance work
carried out immediately.
▶ Have any defects in the heating system remedied
immediately, independent of the annual inspection.
HFittings and modification
Only a competent engineer can remove the appliance
case and carry out any work, in accordance with the
relevant Installation Regulations.
Any misuse or unauthorised modifications to the
appliance, flue or associated accessories and heating
system will invalidate the guarantee.
▶ Do not modify the appliance or flue system in any
way.
Worcester, Bosch Group accepts no liability arising
from any such actions. This does not affect your
statutory rights.

Product Information
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Greenstar 8000 Life – 6720883873 (2021/05)
HCombustion air/ambient air
The air in the installation location must be free of
flammable or chemically aggressive substances.
▶ Do not store or use any flammable or explosive
materials (paper, petrol, thinners, paints, etc.) in
the vicinity of the heat source.
▶ Do not store or use any corrosive substances
(solvents, adhesives, chlorinated cleaning agents,
etc.) in the vicinity of the heat source.
HGeneral considerations
▶ The boiler must be installed in a well ventilated area.
The openings must be kept in good condition.
▶ The vents or any other component contributing to
the functioning of the boiler must not be reduced or
sealed.
▶ We recommend an annual service of the appliance
by an approved engineer to ensure reliable and
efficient operation.
HSafety of electrical devices for domestic use
and similar purposes
The following requirements apply in accordance with
EN 60335-1 in order to prevent hazards from
occurring when using electrical appliances:
“This appliance can be used by children of 8 years and
older, as well as by people with reduced physical,
sensory or mental capabilities or lacking in experience
and knowledge, if they are supervised and have been
given instruction in the safe use of the appliance and
understand the resulting dangers. Children shall not
play with the appliance. Cleaning and user
maintenance must not be performed by children
without supervision.”
“If the power cable is damaged, it must be replaced by
the manufacturer, its customer service department or
a similarly qualified person, so that risks are avoided.”
HPlease read these instructions carefully
▶ These instructions are applicable to the Worcester
appliance model/s stated on the front cover only.
▶ These instructions apply in the UK/IE only and must
be followed except for any statutory obligation.
2ProductInformation
2.1 Appliance identification and serial number
Fig. 1 Position of data label
The data label contains information of the appliance model and serial
number. This is located on the frame of the front cover.
For your own records
Please ensure that the Commissioning Checklist has been completed by
your installer or service engineer.
Table 2 Appliance details
The appliance model and serial number can be found on the appliance
data label.
2.2 Servicing
Ensure that the service engineer completes the Service Record in the
Benchmark Checklist after each service.
The Service Record can be found at the rear of the appliance’s
Installation and Maintenance Instructions. It will be required in the event
of any guarantee work and may be required by the local Building Control
Inspector.
▶ To ensure the continued safe, reliable and environmentally optimum
operation of the boiler, it must be thoroughly serviced annually by a
competent, qualified person, such as a Worcester service engineer,
British Gas engineer or other Gas Safe registered engineer. In the
Republic of Ireland servicing work must be carried out by a Worcester
service engineer or other Registered Gas Installer (RGII).
– Having a contract covering annual servicing, cleaning and
maintenance is a good way to ensure this is not missed.
– It is important that any required maintenance or repairs are
carried out without delay.
Model:
Serial number:
Date of installation:
0010022840-001

Prepare for operation
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▶ Ensure that the service engineer completes the Service Record, at
the rear of the Installation and Maintenance Instructions manual,
after each service.
▶ Have any work carried out by a competent, qualified person,
Worcester service engineer, British Gas engineer or other Gas Safe
registered engineer. In the Republic of Ireland servicing work must be
carried out by a Worcester service engineer or other Registered Gas
Installer (RGII).
▶ Always use original spares, to help maintain the efficiency, safety and
reliability of the appliance.
2.3 Maintaining your appliance
Your new appliance represents a long term investment in a reliable, high
quality product.
Wipe the appliance casing with a soft clean cloth. Please do not use
chemical cleaning products which may damage the paint finish.
In order to realise the appliance’s maximum working life, and to ensure
the appliance continues to operate at peak efficiency and performance,
it is essential that servicing and maintenance checks are performed at
least once a year by a competent engineer in accordance with the current
Gas Safe Regulations.
If you would like to know more about servicing options from Worcester,
Bosch Group, please visit worcester-bosch.co.uk.
Please tick the appropriate box on your warranty registration card for
further details of the Worcester, Bosch Group Service Contract.
When your appliance requires servicing please contact a Worcester,
Bosch Group contact centre (see rear cover, appointments).
In addition to the service contract we are pleased to offer a one-off
annual service or breakdown call out for your appliance.
Maintenance tips
• Appliances on a sealed heating system:
– Regularly check the system pressure.
• Do not obstruct the flue outlet or the air inlet.
• Use in hard water areas:
– In exceptionally hard water areas a device to prevent scale
formation may be fitted. Installation of a salt based water softener
should be in accordance with the requirements of the local water
company. A bypass valve must be fitted and used to fill/top up the
heating system with untreated water.
Important note:
▶ If you have to add water regularly in your heating system, call a
competent, qualified person.
2.4 Benchmark standard
The Benchmark initiative is a code of practice
to encourage the correct installation,
commissioning and servicing of domestic
central heating appliances and system
equipment.
A “checklist” is dispatched with every appliance and can be found
towards the back of the Installation, Commissioning and Servicing
Instructions. This is a vital document that needs to be completed by the
installer at the time of installation. It confirms that the appliance has
been installed and commissioned according to the manufacturer's
instructions.
The service record provides space for the recording of regular servicing
of the appliance/heating system and this can become a valuable
document when, for example, you wish to sell the property. The service
record will show a potential purchaser that the heating system has
received regular professional maintenance and servicing during its
lifetime.
The Benchmark initiative aims to:
• Raise standards among professional installers.
• Build and maintain high safety standards in the industry.
• Improve customer satisfaction levels.
• Make a contribution to the nation's commitment to climate change.
3 Prepare for operation
3.1 Open vented heating system
Appliances that can be connected to open vented heating systems will
have the pressure maintained automatically by the header cylinder
feeding the system.
3.2 Sealed heating system
Appliances that can be connected to sealed heating systems are pre-
pressurised before operation, this pressure must be maintained for safe
use of the appliance.
▶ Check regularly that the pressure is maintained.
▶ Re-charge the system if the external pressure gauge less than 1 bar.
▶ If a permanent significant decrease or increase in pressure is
indicated, contact your installer or maintenance engineer.
3.2.1 Constantly re-pressurising the system
Constantly having to re-pressurise the heating system should be
investigated as it is an indicator of potential leaks and the concentration
of inhibitor protection in the system will be reduced; this can result in
corrosion within the heating system, reducing efficiency and increasing
contaminates.
▶ Check for leaks on heating system (pipework and radiator valves).
▶ Contact your installer or maintenance engineer if a recurring
significant decrease or increase in pressure is indicated on the
pressure screen.
System pressure increasing:
▶ If the system pressure repeatedly increases and you need to vent air
from the radiators, refer to section 3.3 "Topping up the system
pressure", page 7.

Operating the appliance
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Greenstar 8000 Life – 6720883873 (2021/05)
3.3 Topping up the system pressure
External filling loop
Once the external filling loop and the external pressure gauge have been
located, follow the instructions for re-pressurising the system.
▶ Unscrew the blanking cap [1].
▶ Attach the hose [2] to the valve.
– Usually one end of the hose is already connected to one of the
system fill isolation valves.
▶ Ensure both ends [3] of the hose are screwed on hand tight.
▶ Monitor the pressure via the external pressure gauge.
– The system fill isolation valves [4] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Turn the handle/screwdriver slot through 90° to open valves and
slowly fill the system.
– The system fill isolation valves [5] are opened (the handle/
screwdriver slot is in-line with the valve).
– The pressure at the display will start to rise.
▶ Set the pressure between 1 and 1.5 bar pressure.
▶ Turn the handles/screwdriver slots back, through 90°, to close the
valves.
– The system fill isolation valves [6] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Top up the system pressure, if as a result of the air bleeding the
pressure drops off.
Once the pressure has settled between 1 and 1.5 bar.
▶ Ensure the valves are closed.
▶ Remove the hose [2] and replace the blanking cap [1].
Fig. 2
If the pressure reads more than 1.5 bar as a result of over filling:
▶ Bleed one radiator until the pressure gauge returns to between 1 and
1.5 bar.
4 Operating the appliance
4.1 Control panel overview
Fig. 3 Control panel
[1] Display
[2] and keys: To navigate through menus and increase/decrease
settings
[3] dkey: Return/back
[4] ok key: Save settings, Chimney sweeper key (Service Engineer
function): press 5 seconds for chimney sweeper mode
[5] eco key: Hot water preheat selection (not applicable for regular
appliances)
[6] Hot water key: Adjusting the hot water temperature (not
applicable for regular appliances)
[7] Heating key: Heating mode on, set the maximum flow
temperature
4.2 Symbols in the display
Table 3 Symbols in the display
0010026889-001
1
2
3
4
5
6
Symbol Explanation
Central heating ON
Is displayed with the appliance status code and diagnostic
code during a fault condition
Burner ON/OFF
Connection with the Wi-Fi network (only available with
accessories)
Connection with RF transmitter, e.g. Comfort+ II RF room
thermostat (only available with Key accessories)
chimney sweep mode
Service mode
Eco-Mode (not applicable for regular appliances)
Hot water ON (not applicable for regular appliances)
0010021505-001
reset
eco
5 sec
ok
1
2
3
5
6
7
4

Key (accessories)
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The heating settings have been adjusted by the installer to the
appliance’s optimum settings.
▶ Before making any adjustments it is advisable to make a note of these
settings so that you can return to these optimum settings in the
future.
4.3 Heating key
The heating key is used to set the max. flow temperature. The maximum
flow temperature can be set between 30 °C and 88 °C1). The current
flow temperature is shown on the display.
With underfloor heating systems observe the maximum permissible flow
temperature.
▶ Press the (key.
The set maximum flow temperature appears.
▶ Press the or keys to setthe desired maximum flow temperature.
Table 4 Maximum flow temperature
▶ To save the setting, press the ok key or wait for 2 seconds.
The symbol appears for a short time.
If a time program is activated and set on auto press the ok key to switch
to Advance. Time programs are available with Key (accessories).
auto: Heating is switched on and off according to programmed times for
heating.
Advance: Switch to Advance to move to the next on or off time and
directly switch on or off heating.
5 Key (accessories)
5.1 Installing the Key
Installing the Key will enable additional functions. For Pairing Key
manual.
Always turn off the power to the appliance before installing Key
(accessories).
▶ Plug Key into Key housing.
Fig. 4 Position of Key housing
Fig. 5 Locking mechanism
▶ The lever [2] of the locking mechanism is located right hand side of
the Key housing. Ensure that it is in its Open position before inserting
the Key and pulling lever [2] towards front.
▶Turnonthepower.
LED [1] starts blinking green.
▶ Wait until LED is constantly yellow.
1) The maximum value can be reduced by the service technician.
Supply temperature Sample application
Approx. 50 °C Underfloor heating system
Approx. 75 °C Radiator heating system
Approx. 82 °C Convector heating system
0010022807-002
1. 2.
0010023127-001
1
2

Shutdown
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Greenstar 8000 Life – 6720883873 (2021/05)
5.2 Key LED
Key LED status
The LED on the Key displays different states with flashing or constant
colours.
Table 5 LED status
6Shutdown
6.1 Setting frost protection
NOTICE
Risk of damage to the system from frost!
The heating system can freeze up after a prolonged period (e.g. during a
power failure, switching off the power supply, faulty fuel supply, boiler
fault etc.).
▶ Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
If you are leaving your property unoccupied during cold weather, please
leave your external programmer on constant and your room thermostat
set to 12 °C.
7 Thermal disinfection
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
CAUTION
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the
draw-off points.
▶ Set the thermal disinfection in the hot water program of the heating
controller (heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Set any DHW circulation pump to continuous operation.
▶ Wait until the maximum temperature is reached.
▶ Open all DHW draw-off points, from the nearest to the one furthest
away, and draw off hot water until hot water at a minimum of 70 °C
has flown from all draw-off points for at least 3 minutes.
▶ Restore the original settings.
8 Clearances and ventilation information
8.1 Appliance clearances
Your installer will have provided adequate space around the appliance
for operation, safety and servicing/maintenance access.
• The following detail the necessary clearance around the appliance for
service and maintenance.
CAUTION
Risk of damage to appliance or property
The appliance will overheat if the clearance space around the appliance
is restricted by objects.
▶ Do not restrict this space with the addition of cupboards, shelves etc.
next to or around the appliance.
▶ Do not store any combustible materials on or next to the appliance,
such as clothes, towels, paper or plastic bags.
Fig. 6 Appliance minimum clearances
Description of the LED displays Example
Flashing red:
Fault, e.g. no communication between the Key and
appliance:
▶ Install the Key again, restore the last functioning
status.
Flashing yellow:
No fault, user please wait.
Flashing green:
No fault, initialisation process is running.
Constant red:
Temporary fault:
▶ Wait for normal operating condition to be resumed.
Constant yellow:
No fault, time and date not available:
▶ Set the time and date on the appliance.
-or-
▶ Key with touch-sensitive indicator: Press touch-
sensitive indicator on Key to start pairing.
Constant green:
No fault, normal operating condition.
LED Off:
No fault, power-saving mode or appliance without power.
0010012940-001

Malfunction or failure
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Table 6
[*] Height for either 60/100 flue or 80/125 flue
8.2 Ventilation information
The air supply must not be restricted or contaminated.
Ventilation considerations
▶ Do not place objects to hinder the air circulation required by the
appliance.
▶ The installation premises may require ventilation to be fitted
according to its features or use.
9 Malfunction or failure
If you believe there is a problem with your central heating or hot water
supply, before you contact your installer/maintenance engineer and
report the error and appliance type carry out the following checks.
Basic checks
Some items to check before placing a call are:
• Is the electrical power switched on to the appliance?
• Is the programmer/timer set to ON or in an ON period?
• Is the room thermostat set too low?
• Is the cylinder thermostat (if fitted) set too low?
• Is the cold water main turned on?
• Sealed heating system:
– Is the static system pressure (when appliance is cold) between
1 and 1.5 bar?
•Doyouhavegas?
– Are other gas appliances working, gas cooker/hob for example?
– Has your credit run out on your gas pre-payment meter?
Details of your installer should be available in the Commissioning
Checklist or can be recorded in the following section.
Installer/maintenance engineer
Table 7
Worcester, Bosch Group
The appliance is supported in the UK and Eire by Worcester, Bosch
Group.
Specialist service engineers are available to attend an appliance
breakdown.
Invoices for attendance and repair work carried out on this appliance by
any third party will not be accepted.
• No charge will be made for parts and/or labour providing:
– The appliance fault is found and the appliance is within the
guarantee period. Reasonable evidence of this must be supplied
on request. i.e. a completed Commissioning and service record
and has been regularly serviced at least once a year.
• A call-out charge will be made where:
– The appliance is outside the guarantee period or has not been
serviced in accordance with the manufacturers instructions.
– Our Field Service Engineer finds no fault with the appliance.
– The cause of breakdown is misuse or with other parts of your
plumbing/heating system, or with equipment not supplied by
Worcester, Bosch Group.
No appliance fault is found on over 30% of all service calls.
▶ In the case of a suspected fault, refer to the basic checks earlier in this
section.
In the event of an appliance fault or breakdown please contact
Worcester, Bosch Group appointments team on 0330 123 9339. Your
advisor will arrange for an engineer to call with the minimum of delay;
under normal circumstances this will be from 1‒3 working days
(excluding weekends and bank holidays) for priority breakdown
situations (no hot water and/or heating).
9.1 Troubleshooting
If there is fault in the system, there will be a message shown on the
display. The cause of the fault is coded (e.g. fault code 232).
▶ Press the and keys together until fault disappears.
The appliance starts up again and the current supply temperature is
displayed.
If a fault persists:
▶ Contact the contractor or the customer service.
▶ Provide them with the displayed fault code and the device data
(table 2).
Minimum clearances
Description Dimensions [mm]
X Appliance width 440
YAppliance height 780
Z Appliance depth 365
Installation/Maintenance
1 Overall clearance height 1,150/1,190*
2Overall clearance depth 965
3In front of appliance 450
4Overall clearance width 450
5 Above the appliance 170/210*
6Either side of appliance 5
7 Below the appliance 200
8Compartment depth 385
9 Appliance to removable door 20
Installer/maintenance engineer details
Engineer name:
Company
name:
Company
address:
Telephone:
Email:

Malfunction or failure
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Greenstar 8000 Life – 6720883873 (2021/05)
9.2 Extreme cold weather
In certain instances where the condensate pipe work is run externally or
in an unheated area, such as a garage, the condensate pipe work can be
at risk of freezing, even if well insulated.
A frozen/blocked condensate pipe will cause the boiler to shut down.
Worcester, Bosch Group have available helpful videos on thawing frozen
condensate pipe work on our website in the Customer service section.
WARNING
Falling hazard!
Failure to follow this guidance may result in personal injury.
▶ Only attempt to thaw a condensate pipe that is at ground level and
easily accessible.
▶ Never attempt to thaw a condensate pipe that is at height.
CAUTION
Risk of damage to pipe work!
Thermal shock from boiling water can damage plastic pipes.
▶DO NOT use boiling water to thaw the condensate pipe!
CAUTION
Slip hazard
▶ Ensure that the subsequent freezing of any water does not result in a
slip hazard.
If the condensate pipe has frozen:
▶ Locate the blockage.
– It is likely that the pipe is frozen at the most exposed point outside
the building or where there is an obstruction to flow. This could be
the open end of the pipe, at a bend or elbow, or where there is a
sag in the pipe in which condensate can collect.
– The location of the blockage should be identified as closely as
possible before taking further action.
▶ Thaw the frozen pipe.
– The pipe can be thawed by applying a hot water bottle, a
microwaveable heating pack (the sort used for muscular aches
and pains) or a cloth soaked in hot water to the exterior of the
pipe, close to the point of blockage.
– Hot water, but not boiling, can also be poured onto the pipe from
a watering can or similar container.
– Care must be taken at pedestrian areas where this water may
freeze and create a slip hazard.
▶ Worcester, Bosch Group have available on our website helpful videos
in the Customer service section to aid in thawing a frozen pipe.
▶ Reset the appliance and wait two or three minutes for the appliance
to restart.
▶ Contact Worcester, Bosch Group Appointments Team on:
0330 123 9339, if the boiler does not restart.
▶ Contact your installer in order to find a permanent solution to the
problem.
9.3 System gassing troubleshooting
WARNING
Caution must be exercised when venting radiators or adjusting
system pressure after commissioning of your boiler.
Do not repeatedly vent your radiators, if symptoms persist, contact a
heating engineer.
▶ Do not vent air from radiators whilst the central heating is switched
on; turn your boiler off.
▶ Whilst venting radiators, do not allow the pressure on the boiler to
drop below the pressure at which it is normally set.
CAUTION
If the pressure in your heating system is repeatedly rising (this can
be checked via the boilers pressure gauge or digital display and
should be checked when the system is cold), and especially if you
need to keep venting the radiators, urgent action is required and you
must contact a heating engineer. This can indicate that there is
corrosion occurring within the heating system
Note: Ensure the reading stays between minimum and maximum
operating pressures at all times whilst the boiler is operating
▶ This must be properly addressed to prevent serious damage to the
entire system.
▶ Failure to properly maintain the heating system may affect your
warranty.

Malfunction or failure
Greenstar 8000 Life – 6720883873 (2021/05)
12
Fig. 7 Gassing flow chart
Is your system pressure constantly increasing even
when the boiler is off for extended periods of time?
NO
NO
NO
YES
YES
YES
Is your system pressure regularly
dropping (i.e. you constantly
have to top up your boilers pressure)
Can you confirm that the filling
link is not stuck open/passing
water in any way?
Does system pressure
increase when the
boiler is on?
Does the system pressure increase to
the high pressure red zone on the
pressure gauge?
Does the problem persist?
Contact
a
service
engineer
NO YES
Your
boiler
is
fine
0010036321-001
NO
Your
boiler
is
fine
YES
Contact
a
service
engineer
NO
Your
boiler
is
fine
YES
Contact
a
service
engineer

Environmental protection and disposal
13
Greenstar 8000 Life – 6720883873 (2021/05)
10 Environmental protection and disposal
Environmental protection is a fundamental corporate strategy of the
Bosch Group.
The quality of our products, their economy and environmental safety are
all of equal importance to us and all environmental protection legislation
and regulations are strictly observed.
We use the best possible technology and materials for protecting the
environment taking account of economic considerations.
Packaging
Where packaging is concerned, we participate in country-specific
recycling processes that ensure optimum recycling.
All of our packaging materials are environmentally compatible and can be
recycled.
Used appliances
Used appliances contain valuable materials that can be recycled.
The various assemblies can be easily dismantled. Synthetic materials are
marked accordingly. Assemblies can therefore be sorted by composition
and passed on for recycling or disposal.
Old electrical and electronic appliances
This symbol means that the product must not be disposed
of with other waste, and instead must be taken to the waste
collection points for treatment, collection, recycling and
disposal.
The symbol is valid in countries where waste electrical and
electronic equipment regulations apply, e.g. "European Directive 2012/
19/EC on old electronic and electrical appliances". These regulations
define the framework for the return and recycling of old electronic
appliances that apply in each country.
As electronic devices may contain hazardous substances, it needs to be
recycled responsibly in order to minimize any potential harm to the
environment and human health. Furthermore, recycling of electronic
scrap helps preserve natural resources.
For additional information on the environmentally compatible disposal
of old electrical and electronic appliances, please contact the relevant
local authorities, your household waste disposal service or the retailer
where you purchased the product.
You can find more information here:
www.weee.bosch-thermotechnology.com/
Batteries
Batteries must not be disposed together with your household waste.
Used batteries must be disposed of in local collection systems.

Tips on energy saving
Greenstar 8000 Life – 6720883873 (2021/05)
14
11 Tips on energy saving
Heating economically
The appliance provides a high level of comfort whilst keeping fuel
consumption and the environment effects as low as possible.
The appliance is controlled in such a way that it delivers heat at the
correct rate and only if there is a clear demand from the system.
Central heating systems with thermostatic radiator valves
With modern heating systems set around a 20 °C heat loss, the optimum
setting for a condensing boiler will be approximately 65 °C for the central
heating temperature. This is to ensure a return temperature of less than
52 °C.
The system must be balanced correctly and the radiators may need
upgrading. This allows the boiler to condense as much as possible for the
central heating system.
The temperature of each room can be set individually (except primary
room with the room thermostat) using the thermostatic radiator valves.
Room thermostats
Reducing the setting of the room thermostat by 1 °C can reduce fuel
consumption by up to 10%.
New control systems
Upgrade your heating control system if necessary with the latest
equipment available.
Roof insulation
Around 30% of the heat loss from a property is through the roof. Replace
any old insulation with new insulation, preferably of around 200mm
thickness or more.
Window frames
Single glazed windows, particularly those with steel frames, can lose a
great deal of heat. Consideration should be given to replacement with
PVCu or wooden framed double glazed units.
Radiators
If a radiator is sited underneath a window, its performance will be
affected if the curtains are allowed to drape over the radiator. Shelves
fitted above or in front of the radiator should also be avoided.
It is advisable to manually adjust all thermostatic radiator valves every
2‒3 months to prevent them sticking. Ensure radiator valves are
correctly set and not damaged.
Draughts
Try to ensure that draughts around doors, windows, letter boxes and
keyholes etc. are reduced by using a suitable draught excluder.
WARNING
Air vents!
▶ Do not block or seal any air vents that are installed to ensure that the
appliance operates safely.
Curtains
Lined curtains, or heavier full length curtains can provide excellent
insulation. However, always ensure that the curtains do not drape over
radiators.

Your guarantee
15
Greenstar 8000 Life – 6720883873 (2021/05)
12 Your guarantee
This appliance has a guarantee against faulty materials or workmanship
from the date of installation subject to the following terms and
conditions:
• During the period of this guarantee any components of the appliance
that are proven to be faulty or defective in manufacture will be
exchanged or repaired free of charge by Bosch Thermotechnology
Ltd.
• The householder may be asked to prove the date of installation, that
the appliance was correctly commissioned and, where appropriate,
serviced to the satisfaction of Bosch Thermotechnology Ltd. These
should be documented in the commissioning and service records in
the Installation and Maintenance Instructions.
• The appliance has been used only for the normal domestic purposes
for which it was designed.
This guarantee does not affect your statutory rights.
Guarantee registration
Your appliance/product carries a guarantee against faulty material or
manufacture subject to Terms and Conditions.
To read the full Terms & Conditions please visit us on-line at
www.worcester-bosch.co.uk/guarantee.
Your statutory rights are not affected by the manufacturer’s guarantee

Energy consumption
Greenstar 8000 Life – 6720883873 (2021/05)
16
13 Energy consumption
The maximum heat output of this boiler can be adjusted to suit the exact
requirements of the building. The process of adjusting the maximum
heat output is commonly referred to as range rating. The new boiler is set
at the maximum output and should be adjusted when it is installed and
commissioned. In accordance with the standards, the declared space
heating efficiency, useful efficiency and NOxvalues efficiency for this
range rated boiler are not measured at the maximum output. To achieve
the published efficiency and NOxvalues, the gas rate should be reduced
by your installer during commissioning (Installation and Maintenance
instructions).
13.1 Product data on energy consumption
The information provided fulfills the requirements of regulations (EU) 811/2013 and (EU) 813/2013.
Table 8 Product data on energy consumption Greenstar 8000 Life
Product data Symbol Unit 7 738 100 809/860 7 738 100 810/861
Product type – – GR8300iW 30 R NG/LPG GR8300iW 35 R NG/LPG
Energy Efficiency Class – – A A
Range rated heat output Prated kW 30 34
Seasonal space heating energy efficiency at range rated output s% 94 94
Annual energy consumption (average climate conditions) QHE kWH – –
Annual energy consumption QHE GJ 69 78
Sound power level, indoors LWA dB 53 53
Special precautions to be taken during assembly, installation or
maintenance (if applicable)
– – product accompanying
documents
product accompanying
documents
Condensing boiler – – Yes Yes
Low temperature boiler – – No No
B1 boiler – – No No
Cogeneration space heater – – No No
Combination heater – – No No
Useful heat output
At rated heat output and high temperature regime P4kW 29.5 33.7
At 30% of rated heat output and low temperature regime P1kW 9.9 11.3
Useful efficiency
At rated heat output and high temperature regime 4%88.5 88.8
At 30% of rated heat output and low temperature regime 1% 98.7 98.8
Auxiliary electricity consumption
At full load elmax kW 0.067 0.048
At part load elmin kW 0.014 0.013
In standby mode PSB kW 0.001 0.001
Other items
Standby heat loss Pstby kW 0.071 0.071
Ignition burner power consumption Pign kWh – –
Emissions of nitrogen oxides (only gas- or oil fired) at range rated
output
NOxmg/kWh 23 25

Energy consumption
17
Greenstar 8000 Life – 6720883873 (2021/05)
The information provided fulfills the requirements of regulations (EU) 811/2013 and (EU) 813/2013.
Specific precautions for installation, maintenance as well as recycling and/or disposal are provided within the installation and operating manuals. Read
and follow the installation and operating manuals.
Table 9 Product data on energy consumption Greenstar 8000 Life
Product data Symbol Unit 7 738 100 811/862 7 738 100 812/863
Product type – – GR8300iW 40 R NG/LPG GR8300iW 45 R NG/LPG
Energy Efficiency Class – – A A
Range rated heat output Prated kW 40 42
Seasonal space heating energy efficiency at range rated output s% 94 94
Annual energy consumption (average climate conditions) QHE kWH – –
Annual energy consumption QHE GJ 78 78
Sound power level, indoors LWA dB 55 55
Special precautions to be taken during assembly, installation or
maintenance (if applicable)
– – product accompanying
documents
product accompanying
documents
Condensing boiler – – Yes Yes
Low temperature boiler – – No No
B1 boiler – – No No
Cogeneration space heater – – No No
Combination heater – – No No
Useful heat output
At rated heat output and high temperature regime P4kW 40.0 42.0
At 30% of rated heat output and low temperature regime P1kW 13.4 14.4
Useful efficiency
At rated heat output and high temperature regime 4%88.6 88.7
At 30% of rated heat output and low temperature regime 1% 98.7 99.3
Auxiliary electricity consumption
At full load elmax kW 0.075 0.084
At part load elmin kW 0.014 0.014
In standby mode PSB kW 0.001 0.001
Other items
Standby heat loss Pstby kW 0.071 0.067
Ignition burner power consumption Pign kWh – –
Emissions of nitrogen oxides (only gas- or oil fired) at range rated
output
NOxmg/kWh 25 27

Energy consumption
Greenstar 8000 Life – 6720883873 (2021/05)
18
The information provided fulfills the requirements of regulations (EU) 811/2013 and (EU) 813/2013.
Specific precautions for installation, maintenance as well as recycling and/or disposal are provided within the installation and operating manuals. Read
and follow the installation and operating manuals.
Table 10 Product data on energy consumption Greenstar 8000 Life
Product data Symbol Unit 7 738 100 813/864
Product type – – GR8300iW 50 R NG/LPG
Energy Efficiency Class – – A
Range rated heat output Prated kW 48
Seasonal energy efficiency for central heating at range rated output s% 94
Annual energy consumption (average climate conditions) QHE kWh –
Annual energy consumption QHE GJ 78
Sound power level, indoors LWA dB 55
Special precautions to be taken during assembly, installation or
maintenance (if applicable)
– – product accompanying documents
Condensing boiler – – Yes
Low temperature boiler – – No
B1 boiler – – No
Cogeneration space heater – – No
Combination heater – – No
Useful heat output
At rated heat output and high temperature regime P4kW 47.9
At 30% of rated heat output and low temperature regime P1kW 16.2
Useful efficiency
At rated heat output and high temperature regime 4%88.7
At 30% of rated heat output and low temperature regime 1% 99.3
Auxiliary electricity consumption
At full load elmax kW 0.084
At part load elmin kW 0.014
In standby mode PSB kW 0.001
Other items
Standby heat loss Pstby kW 0.067
Ignition burner power consumption Ping kWh –
Emissions of nitrogen oxides (only gas- or oil fired) at range rated
output
NOxmg/kWh 30

Bosch Thermotechnology Ltd.
Cotswold Way, Warndon
Worcester WR4 9SW
United Kingdom
Tel. [phone]
worcester-bosch.co.uk
TECHNICAL SUPPORT: 0330 123 3366
RENEWABLE SUPPORT: 0330 123 9229
CONTROLS AND CONNECTIVITY TEAM: 0330 123 3641
APPOINTMENTS: 0330 123 9339
SPARES: 0330 123 9779
LITERATURE: 0330 123 9119
TRAINING: 0330 123 0166
SALES: 0330 123 9669