Technical data

32
The Greenstar Si condensing combi boiler series
Total heating and hot water comfort
The Greenstar Si condensing combi boiler series ● The advantages of a combi system
25Si 30Si
Output kW
Flow rate at 35º 10.2 lt/min 12.3 lt/min
CH temperature control
✓✓
DHW temperature
control
✓✓
Modulating control ✓✓
Natural gas
✓✓
LPG
✓✓
Electronic ignition
✓✓
The Greenstar Si series at a glance
Min 7.2kW 7.2kW
Max 25.0kW 30.0kW
The Greenstar Si condensing combi system layout ● Installing the Greenstar Si Series
Greenstar Si series horizontal fluing options
● Greenstar Si series vertical fluing options
Installation requirements
The Greenstar Si series accessories
● After-sales
Worcester Bosch training
The Greenstar Si combi series
Adjustable hot water
control.
Aluminium silicon heat
exchanger.
Boiler keep hot
facility.
SEDBUK Band A.
Less than 28kg lift
weight.
Wall mounting jig.
Compact dimensions.
Modulation control.
Optional filling link.
Optional mechanical
and digital timeclocks.
Radio frequency
controlled room
thermostat.
Anti-cycle control.
Electronic ignition.
Built-in frost protection.
Multi-directional
fluing.
No ventilation grilles
required for
compartment
installations.
Fault finding
diagnostics.
Operational status
indicator.
Built-in boiler bypass.
Pump seizure
protection.
User comfort and
economy.
High efficiency.
Instantly heated hot
water.
High efficiency.
One man lift.
Allows pre-fabrication
of system.
Space saving, ease of
siting.
Energy saving.
Labour saving.
Eliminates the need for
external wiring.
Eliminates wiring, helps
comply with part L of
Building Regulations.
Energy saving.
Energy saving.
Money saving,
economical protection.
Siting flexibility.
Money and labour
saving.
Time saving.
Consumer friendly.
Labour and money
saving.
Prevents callbacks.
It’s often said that you can’t please everybody all of the time – but
the advanced new series of Greenstar Si condensing combi boilers
from Worcester Bosch has so much to offer that it’s already disproving
such a notion.
Here is a groundbreaking range of energy-saving boilers which is very
good news for the environment and excellent news for specifiers,
developers, installers and consumers alike.
Higher efficiency and highly
cost effective
Up to an incredible 97% of the
gas consumed by a new
Greenstar Si condensing combi
boiler is converted into heat for
the heating and/or hot water
system. Other types of boiler
achieve around 80% efficiency.
Therefore, compared with a new
conventional combi boiler, a Greenstar Si can cut heating and hot water
bills by between15-20% – and it’s up to 30% cheaper to run than an
older boiler.
Hence SEDBUK Band A ratings for all models in the new Greenstar Si
condensing combi range.
Greenstar Si condensing combi boilers deliver this energy-saving
performance by ingeniously recycling exhaust gases to extract and
re-use the latent heat – a highly efficient use of energy which also
significantly reduces carbon dioxide emissions into the atmosphere.
To all these major benefits you can add yet more: superlative Worcester
Bosch quality and reliability; a range of outputs to satisfy the heating
demands of a range of households; and truly exceptional
all-round value for money.
20%
USEFUL
HEAT
OUTPUT
USEFUL
HEAT
OUTPUT
3%
COMBUSTION
PRODUCTS
NEW CONVENTIONAL
BOILER
GREENSTAR
CONDENSING
BOILER
80%
GROSS
97%
GROSS
COMBUSTION
PRODUCTS
COMBUSTION
PRODUCTS
COMBUSTION
PRODUCTS
OLD
EXISTING BOILER
60 - 70%
EFFICIENCY
NEW
CONVENTIONAL BOILER
80%
EFFICIENCY
GREENSTAR Si
CONDENSING BOILER
97%
EFFICIENCY
OLD
EXISTING
BOILER
NEW
CONVENTIONAL
BOILER
GREENSTAR Si IN
CONDENSING
MODE
23,600 kWh
804 therms
19,588 kWh
667 therms
BASED ON
3 BEDROOM
SEMI-DETACHED
HOUSE
27,140 kWh
924 therms